feat(tests): basic tests

.github/workflows/test.yml

@@ -31,7 +31,7 @@ jobs:
             python:
               - 'scripts/**'
               - 'scrapers/**'
-              - 'tests/scrapers/**'
+              - 'tests/**'
               - 'pyproject.toml'
               - 'uv.lock'
 
@@ -64,4 +64,4 @@ jobs:
       - name: Fetch camoufox data
         run: uv run camoufox fetch
       - name: Run Python tests
-        run: uv run pytest tests/scrapers/ -v
+        run: uv run pytest tests/ -v

.pre-commit-config.yaml

@@ -6,7 +6,6 @@ repos:
       - id: stylua-github
         name: stylua (Lua formatter)
         args: ["."]
-        files: ^(lua/|spec/|plugin/|after/|ftdetect/|.*\.lua$)
         additional_dependencies: []
   - repo: https://github.com/astral-sh/ruff-pre-commit
     rev: v0.6.9
@@ -16,16 +15,14 @@ repos:
         files: ^(scrapers/|tests/scrapers/|.*\.py$)
       - id: ruff
         name: ruff (lint)
-        args: ["--fix", "--select=I"]
+        args: ["--fix", "--select=I", "."]
-        files: ^(scrapers/|tests/scrapers/|.*\.py$)
   - repo: local
     hooks:
       - id: mypy
         name: mypy (type check)
         entry: uv run mypy
         language: system
-        args: ["scrapers/", "tests/scrapers/"]
+        args: ["."]
-        files: ^(scrapers/|tests/scrapers/|.*\.py$)
         pass_filenames: false
   - repo: https://github.com/pre-commit/mirrors-prettier
     rev: v3.1.0

pyproject.toml

@@ -10,6 +10,7 @@ dependencies = [
     "curl-cffi>=0.13.0",
     "httpx>=0.28.1",
     "ndjson>=0.3.1",
+    "pydantic>=2.11.10",
     "requests>=2.32.5",
     "scrapling[fetchers]>=0.3.5",
 ]

scrapers/atcoder.py

@@ -5,7 +5,6 @@ import json
 import re
 import sys
 import time
-from dataclasses import asdict
 from typing import Any
 
 import backoff
@@ -231,16 +230,12 @@ def _scrape_problem_page_sync(contest_id: str, slug: str) -> dict[str, Any]:
 
 def _to_problem_summaries(rows: list[dict[str, str]]) -> list[ProblemSummary]:
     out: list[ProblemSummary] = []
-    seen: set[str] = set()
     for r in rows:
         letter = (r.get("letter") or "").strip().upper()
         title = r.get("title") or ""
         if not letter:
             continue
         pid = letter.lower()
-        if pid in seen:
-            continue
-        seen.add(pid)
         out.append(ProblemSummary(id=pid, name=title))
     return out
 
@@ -341,7 +336,7 @@ async def main_async() -> int:
             success=False,
             error="Usage: atcoder.py metadata <contest_id> OR atcoder.py tests <contest_id> OR atcoder.py contests",
         )
-        print(json.dumps(asdict(result)))
+        print(result.model_dump_json())
         return 1
 
     mode: str = sys.argv[1]
@@ -352,11 +347,11 @@ async def main_async() -> int:
             result = MetadataResult(
                 success=False, error="Usage: atcoder.py metadata <contest_id>"
             )
-            print(json.dumps(asdict(result)))
+            print(result.model_dump_json())
             return 1
         contest_id = sys.argv[2]
         result = await scraper.scrape_contest_metadata(contest_id)
-        print(json.dumps(asdict(result)))
+        print(result.model_dump_json())
         return 0 if result.success else 1
 
     if mode == "tests":
@@ -370,7 +365,7 @@ async def main_async() -> int:
                 timeout_ms=0,
                 memory_mb=0,
             )
-            print(json.dumps(asdict(tests_result)))
+            print(tests_result.model_dump_json())
             return 1
         contest_id = sys.argv[2]
         await scraper.stream_tests_for_category_async(contest_id)
@@ -381,17 +376,17 @@ async def main_async() -> int:
             contest_result = ContestListResult(
                 success=False, error="Usage: atcoder.py contests"
             )
-            print(json.dumps(asdict(contest_result)))
+            print(contest_result.model_dump_json())
             return 1
         contest_result = await scraper.scrape_contest_list()
-        print(json.dumps(asdict(contest_result)))
+        print(contest_result.model_dump_json())
         return 0 if contest_result.success else 1
 
     result = MetadataResult(
         success=False,
         error="Unknown mode. Use 'metadata <contest_id>', 'tests <contest_id>', or 'contests'",
     )
-    print(json.dumps(asdict(result)))
+    print(result.model_dump_json())
     return 1
 
 

scrapers/base.py

@@ -1,20 +1,9 @@
-from __future__ import annotations
-
 from abc import ABC, abstractmethod
-from dataclasses import dataclass
 from typing import Any, Awaitable, Callable, ParamSpec, cast
 
-from .models import ContestListResult, MetadataResult, TestsResult
-
 P = ParamSpec("P")
 
-
+from .models import ContestListResult, MetadataResult, TestsResult
-@dataclass
-class ScraperConfig:
-    timeout_seconds: int = 30
-    max_retries: int = 3
-    backoff_base: float = 2.0
-    rate_limit_delay: float = 1.0
 
 
 class BaseScraper(ABC):
@@ -38,6 +27,7 @@ class BaseScraper(ABC):
             success=False,
             error=f"{self.platform_name}: {error_msg}",
             contest_id=contest_id,
+            problems=[],
         )
 
     def _create_tests_error(
@@ -51,11 +41,14 @@ class BaseScraper(ABC):
             tests=[],
             timeout_ms=0,
             memory_mb=0,
+            interactive=False,
         )
 
     def _create_contests_error(self, error_msg: str) -> ContestListResult:
         return ContestListResult(
-            success=False, error=f"{self.platform_name}: {error_msg}"
+            success=False,
+            error=f"{self.platform_name}: {error_msg}",
+            contests=[],
         )
 
     async def _safe_execute(

scrapers/codeforces.py

@@ -5,7 +5,6 @@ import json
 import logging
 import re
 import sys
-from dataclasses import asdict
 from typing import Any
 
 import requests
@@ -63,8 +62,6 @@ def _extract_limits(block: Tag) -> tuple[int, float]:
 
 def _group_lines_by_id(pre: Tag) -> dict[int, list[str]]:
     groups: dict[int, list[str]] = {}
-    if not isinstance(pre, Tag):
-        return groups
     for div in pre.find_all("div", class_="test-example-line"):
         cls = " ".join(div.get("class", []))
         m = re.search(r"\btest-example-line-(\d+)\b", cls)
@@ -182,12 +179,8 @@ def _scrape_contest_problems_sync(contest_id: str) -> list[ProblemSummary]:
     html = _fetch_problems_html(contest_id)
     blocks = _parse_all_blocks(html)
     problems: list[ProblemSummary] = []
-    seen: set[str] = set()
     for b in blocks:
         pid = b["letter"].upper()
-        if pid in seen:
-            continue
-        seen.add(pid)
         problems.append(ProblemSummary(id=pid.lower(), name=b["name"]))
     return problems
 
@@ -267,7 +260,7 @@ async def main_async() -> int:
             success=False,
             error="Usage: codeforces.py metadata <contest_id> OR codeforces.py tests <contest_id> OR codeforces.py contests",
         )
-        print(json.dumps(asdict(result)))
+        print(result.model_dump_json())
         return 1
 
     mode: str = sys.argv[1]
@@ -278,11 +271,11 @@ async def main_async() -> int:
             result = MetadataResult(
                 success=False, error="Usage: codeforces.py metadata <contest_id>"
             )
-            print(json.dumps(asdict(result)))
+            print(result.model_dump_json())
             return 1
         contest_id = sys.argv[2]
         result = await scraper.scrape_contest_metadata(contest_id)
-        print(json.dumps(asdict(result)))
+        print(result.model_dump_json())
         return 0 if result.success else 1
 
     if mode == "tests":
@@ -296,7 +289,7 @@ async def main_async() -> int:
                 timeout_ms=0,
                 memory_mb=0,
             )
-            print(json.dumps(asdict(tests_result)))
+            print(tests_result.model_dump_json())
             return 1
         contest_id = sys.argv[2]
         await scraper.stream_tests_for_category_async(contest_id)
@@ -307,17 +300,17 @@ async def main_async() -> int:
             contest_result = ContestListResult(
                 success=False, error="Usage: codeforces.py contests"
             )
-            print(json.dumps(asdict(contest_result)))
+            print(contest_result.model_dump_json())
             return 1
         contest_result = await scraper.scrape_contest_list()
-        print(json.dumps(asdict(contest_result)))
+        print(contest_result.model_dump_json())
         return 0 if contest_result.success else 1
 
     result = MetadataResult(
         success=False,
         error="Unknown mode. Use 'metadata <contest_id>', 'tests <contest_id>', or 'contests'",
     )
-    print(json.dumps(asdict(result)))
+    print(result.model_dump_json())
     return 1
 
 

scrapers/cses.py

@@ -4,7 +4,6 @@ import asyncio
 import json
 import re
 import sys
-from dataclasses import asdict
 from typing import Any
 
 import httpx
@@ -251,7 +250,7 @@ async def main_async() -> int:
             success=False,
             error="Usage: cses.py metadata <category_id> OR cses.py tests <category> OR cses.py contests",
         )
-        print(json.dumps(asdict(result)))
+        print(result.model_dump_json())
         return 1
 
     mode: str = sys.argv[1]
@@ -262,11 +261,11 @@ async def main_async() -> int:
             result = MetadataResult(
                 success=False, error="Usage: cses.py metadata <category_id>"
             )
-            print(json.dumps(asdict(result)))
+            print(result.model_dump_json())
             return 1
         category_id = sys.argv[2]
         result = await scraper.scrape_contest_metadata(category_id)
-        print(json.dumps(asdict(result)))
+        print(result.model_dump_json())
         return 0 if result.success else 1
 
     if mode == "tests":
@@ -280,7 +279,7 @@ async def main_async() -> int:
                 timeout_ms=0,
                 memory_mb=0,
             )
-            print(json.dumps(asdict(tests_result)))
+            print(tests_result.model_dump_json())
             return 1
         category = sys.argv[2]
         await scraper.stream_tests_for_category_async(category)
@@ -291,17 +290,17 @@ async def main_async() -> int:
             contest_result = ContestListResult(
                 success=False, error="Usage: cses.py contests"
             )
-            print(json.dumps(asdict(contest_result)))
+            print(contest_result.model_dump_json())
             return 1
         contest_result = await scraper.scrape_contest_list()
-        print(json.dumps(asdict(contest_result)))
+        print(contest_result.model_dump_json())
         return 0 if contest_result.success else 1
 
     result = MetadataResult(
         success=False,
         error=f"Unknown mode: {mode}. Use 'metadata <category>', 'tests <category>', or 'contests'",
     )
-    print(json.dumps(asdict(result)))
+    print(result.model_dump_json())
     return 1
 
 

scrapers/models.py

@@ -1,47 +1,71 @@
-from dataclasses import dataclass, field
+from pydantic import BaseModel, Field
 
 
-@dataclass
+class TestCase(BaseModel):
-class TestCase:
     input: str
     expected: str
 
+    class Config:
+        extra = "forbid"
 
-@dataclass
+
-class ProblemSummary:
+class ProblemSummary(BaseModel):
     id: str
     name: str
 
+    class Config:
+        extra = "forbid"
 
-@dataclass
+
-class ContestSummary:
+class ContestSummary(BaseModel):
     id: str
     name: str
-    display_name: str
+    display_name: str | None = None
+
+    class Config:
+        extra = "forbid"
 
 
-@dataclass
+class ScrapingResult(BaseModel):
-class ScrapingResult:
     success: bool
     error: str
 
+    class Config:
+        extra = "forbid"
+
 
-@dataclass
 class MetadataResult(ScrapingResult):
     contest_id: str = ""
-    problems: list[ProblemSummary] = field(default_factory=list)
+    problems: list[ProblemSummary] = Field(default_factory=list)
+
+    class Config:
+        extra = "forbid"
 
 
-@dataclass
 class ContestListResult(ScrapingResult):
-    contests: list[ContestSummary] = field(default_factory=list)
+    contests: list[ContestSummary] = Field(default_factory=list)
+
+    class Config:
+        extra = "forbid"
 
 
-@dataclass
 class TestsResult(ScrapingResult):
     problem_id: str
     url: str
-    tests: list[TestCase]
+    tests: list[TestCase] = Field(default_factory=list)
     timeout_ms: int
     memory_mb: float
     interactive: bool = False
+
+    class Config:
+        extra = "forbid"
+
+
+class ScraperConfig(BaseModel):
+    timeout_seconds: int = 30
+    max_retries: int = 3
+    backoff_base: float = 2.0
+    rate_limit_delay: float = 1.0
+
+    class Config:
+        extra = "forbid"

tests/conftest.py

@@ -1,43 +1,171 @@
+import io
+import json
 import sys
 from pathlib import Path
+from typing import Callable
 
 import pytest
 
 ROOT = Path(__file__).resolve().parent.parent
-FIXTURES = Path(__file__).resolve().parent / "fixtures"
+FIX = Path(__file__).resolve().parent / "fixtures"
 
 
 @pytest.fixture
 def fixture_text():
-    """Load HTML fixture by filename."""
-
     def _load(name: str) -> str:
-        p = FIXTURES / name
+        p = FIX / name
         return p.read_text(encoding="utf-8")
 
     return _load
 
 
+def _compile_and_exec_module(
+    module_path: Path, offline_fetch_impls: dict[str, Callable]
+):
+    src = module_path.read_text(encoding="utf-8")
+
+    replacements: list[tuple[str, str]] = [
+        ("def _fetch(", "def _orig_fetch("),
+        ("def fetch_text(", "def _orig_fetch_text("),
+        ("async def _get_async(", "async def _orig_get_async("),
+    ]
+    for old, new in replacements:
+        src = src.replace(old, new)
+
+    stub_lines = []
+    if " _orig_fetch(" in src or "def _orig_fetch(" in src:
+        stub_lines.append("_fetch = __offline_fetch_sync")
+    if " _orig_fetch_text(" in src or "def _orig_fetch_text(" in src:
+        stub_lines.append("fetch_text = __offline_fetch_text")
+    if " _orig_get_async(" in src or "async def _orig_get_async(" in src:
+        stub_lines.append("_get_async = __offline_fetch_async")
+    src += "\n" + "\n".join(stub_lines) + "\n"
+
+    ns = {}
+    ns.update(offline_fetch_impls)
+    exec(compile(src, str(module_path), "exec"), ns)
+    return ns
+
+
+def _capture_stdout(coro):
+    import asyncio
+
+    buf = io.StringIO()
+    old = sys.stdout
+    sys.stdout = buf
+    try:
+        rc = asyncio.run(coro)
+        out = buf.getvalue()
+    finally:
+        sys.stdout = old
+    return rc, out
+
+
 @pytest.fixture
-def run_scraper(monkeypatch):
+def run_scraper_offline(fixture_text):
-    def _run(name: str, mode: str, *args, replace_fetch=None) -> dict:
+    def _router_cses(*, path: str | None = None, url: str | None = None) -> str:
-        scraper_path = ROOT / "scrapers" / f"{name}.py"
+        if path == "/problemset/list":
-        ns = {}
+            return fixture_text("cses_contests.html")
-        code = scraper_path.read_text(encoding="utf-8")
+        if path and path.startswith("/problemset/task/"):
-        if replace_fetch:
+            pid = path.rsplit("/", 1)[-1]
-            code = code.replace("def _fetch", "def _fixture_fetch")
+            return fixture_text(f"cses_task_{pid}.html")
-            code += f"\n_fetch = _fixture_fetch\nfetch_text = _fixture_fetch\n"
+        raise AssertionError(f"No fixture for CSES path={path!r}")
-            ns.update(replace_fetch)
+
-        exec(compile(code, str(scraper_path), "exec"), ns)
+    def _router_atcoder(*, path: str | None = None, url: str | None = None) -> str:
+        if not url:
+            raise AssertionError("AtCoder expects url routing")
+        if "/contests/archive" in url:
+            return fixture_text("atcoder_contests.html")
+        if url.endswith("/tasks"):
+            return fixture_text("atcoder_abc100_tasks.html")
+        if "/tasks/" in url:
+            slug = url.rsplit("/", 1)[-1]
+            return fixture_text(f"atcoder_task_{slug}.html")
+        raise AssertionError(f"No fixture for AtCoder url={url!r}")
+
+    def _router_codeforces(*, path: str | None = None, url: str | None = None) -> str:
+        if not url:
+            raise AssertionError("Codeforces expects url routing")
+        if "/contests" in url and "/problem/" not in url:
+            return fixture_text("codeforces_contests.html")
+        if "/problem/" in url:
+            parts = url.rstrip("/").split("/")
+            contest_id, index = parts[-3], parts[-1]
+            return fixture_text(f"codeforces_{contest_id}_{index}.html")
+        if "/problemset/problem/" in url:
+            parts = url.rstrip("/").split("/")
+            contest_id, index = parts[-2], parts[-1]
+            return fixture_text(f"codeforces_{contest_id}_{index}.html")
+        raise AssertionError(f"No fixture for Codeforces url={url!r}")
+
+    def _make_offline_fetches(scraper_name: str):
+        if scraper_name == "cses":
+
+            def __offline_fetch_text(client, path: str) -> str:
+                return _router_cses(path=path)
+
+            return {
+                "__offline_fetch_text": __offline_fetch_text,
+                "__offline_fetch_sync": lambda url: (_ for _ in ()).throw(
+                    AssertionError("CSES doesn't use _fetch")
+                ),
+                "__offline_fetch_async": lambda client, url: (_ for _ in ()).throw(
+                    AssertionError("CSES doesn't use _get_async")
+                ),
+            }
+        if scraper_name == "atcoder":
+
+            async def __offline_fetch_async(client, url: str) -> str:
+                return _router_atcoder(url=url)
+
+            def __offline_fetch_sync(url: str) -> str:
+                return _router_atcoder(url=url)
+
+            return {
+                "__offline_fetch_text": lambda client, path: (_ for _ in ()).throw(
+                    AssertionError("AtCoder doesn't use fetch_text")
+                ),
+                "__offline_fetch_sync": __offline_fetch_sync,
+                "__offline_fetch_async": __offline_fetch_async,
+            }
+        if scraper_name == "codeforces":
+
+            def __offline_fetch_sync(url: str) -> str:
+                return _router_codeforces(url=url)
+
+            return {
+                "__offline_fetch_text": lambda client, path: (_ for _ in ()).throw(
+                    AssertionError("Codeforces doesn't use fetch_text")
+                ),
+                "__offline_fetch_sync": __offline_fetch_sync,
+                "__offline_fetch_async": lambda client, url: (_ for _ in ()).throw(
+                    AssertionError("Codeforces doesn't use _get_async")
+                ),
+            }
+        raise AssertionError(f"Unknown scraper: {scraper_name}")
+
+    def _run(scraper_name: str, mode: str, *args: str):
+        mod_path = ROOT / "scrapers" / f"{scraper_name}.py"
+        ns = _compile_and_exec_module(mod_path, _make_offline_fetches(scraper_name))
         main_async = ns.get("main_async")
-        if not main_async:
+        assert callable(main_async), f"main_async not found in {scraper_name}"
-            raise RuntimeError(f"Could not load main_async from {name}.py")
-        import asyncio
 
-        async def wrapper():
+        argv = [str(mod_path), mode, *args]
-            sys.argv = [str(scraper_path), mode, *args]
+        old_argv = sys.argv
-            return await main_async()
+        sys.argv = argv
+        try:
+            rc, out = _capture_stdout(main_async())
+        finally:
+            sys.argv = old_argv
 
-        return asyncio.run(wrapper())
+        json_lines = []
+        for line in (l for l in out.splitlines() if l.strip()):
+            try:
+                json_lines.append(json.loads(line))
+            except json.JSONDecodeError as e:
+                raise AssertionError(
+                    f"Invalid JSON from {scraper_name} {mode}: {line}"
+                ) from e
+        return rc, json_lines
 
     return _run

tests/fixtures/atcoder_abc100_tasks.html

@@ -0,0 +1,519 @@
+<!doctype html>
+<html>
+  <head>
+    <title>Tasks - AtCoder Beginner Contest 100</title>
+    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
+    <meta http-equiv="Content-Language" content="en" />
+    <meta name="viewport" content="width=device-width,initial-scale=1.0" />
+    <meta name="format-detection" content="telephone=no" />
+    <meta
+      name="google-site-verification"
+      content="nXGC_JxO0yoP1qBzMnYD_xgufO6leSLw1kyNo2HZltM"
+    />
+
+    <script
+      async
+      src="https://www.googletagmanager.com/gtag/js?id=G-RC512FD18N"
+    ></script>
+    <script>
+      window.dataLayer = window.dataLayer || []
+      function gtag() {
+        dataLayer.push(arguments)
+      }
+      gtag('js', new Date())
+      gtag('set', 'user_properties', {
+        login_status: 'logged_out'
+      })
+      gtag('config', 'G-RC512FD18N')
+    </script>
+
+    <meta
+      name="description"
+      content="AtCoder is a programming contest site for anyone from beginners to experts. We hold weekly programming contests online."
+    />
+    <meta name="author" content="AtCoder Inc." />
+
+    <meta property="og:site_name" content="AtCoder" />
+
+    <meta property="og:title" content="Tasks - AtCoder Beginner Contest 100" />
+    <meta
+      property="og:description"
+      content="AtCoder is a programming contest site for anyone from beginners to experts. We hold weekly programming contests online."
+    />
+    <meta property="og:type" content="website" />
+    <meta
+      property="og:url"
+      content="https://atcoder.jp/contests/abc100/tasks"
+    />
+    <meta
+      property="og:image"
+      content="https://img.atcoder.jp/assets/atcoder.png"
+    />
+    <meta name="twitter:card" content="summary" />
+    <meta name="twitter:site" content="@atcoder" />
+
+    <meta
+      property="twitter:title"
+      content="Tasks - AtCoder Beginner Contest 100"
+    />
+
+    <link
+      href="//fonts.googleapis.com/css?family=Lato:400,700"
+      rel="stylesheet"
+      type="text/css"
+    />
+    <link
+      rel="stylesheet"
+      type="text/css"
+      href="//img.atcoder.jp/public/6372bb3/css/bootstrap.min.css"
+    />
+    <link
+      rel="stylesheet"
+      type="text/css"
+      href="//img.atcoder.jp/public/6372bb3/css/base.css"
+    />
+    <link
+      rel="shortcut icon"
+      type="image/png"
+      href="//img.atcoder.jp/assets/favicon.png"
+    />
+    <link rel="apple-touch-icon" href="//img.atcoder.jp/assets/atcoder.png" />
+    <script src="//img.atcoder.jp/public/6372bb3/js/lib/jquery-1.9.1.min.js"></script>
+    <script src="//img.atcoder.jp/public/6372bb3/js/lib/bootstrap.min.js"></script>
+    <script src="//img.atcoder.jp/public/6372bb3/js/cdn/js.cookie.min.js"></script>
+    <script src="//img.atcoder.jp/public/6372bb3/js/cdn/moment.min.js"></script>
+    <script src="//img.atcoder.jp/public/6372bb3/js/cdn/moment_js-ja.js"></script>
+    <script>
+      var LANG = 'en'
+      var userScreenName = ''
+      var csrfToken = 'q+4tZ4tLQh/4nobcpVAuiml6OVEZOdZDZURhPenxPbc='
+    </script>
+    <script src="//img.atcoder.jp/public/6372bb3/js/utils.js"></script>
+
+    <script src="//img.atcoder.jp/public/6372bb3/js/contest.js"></script>
+    <link
+      href="//img.atcoder.jp/public/6372bb3/css/contest.css"
+      rel="stylesheet"
+    />
+    <script>
+      var contestScreenName = 'abc100'
+      var remainingText = 'Remaining Time'
+      var countDownText = 'Contest begins in'
+      var startTime = moment('2018-06-16T21:00:00+09:00')
+      var endTime = moment('2018-06-16T22:40:00+09:00')
+    </script>
+    <style></style>
+
+    <script src="//img.atcoder.jp/public/6372bb3/js/base.js"></script>
+  </head>
+
+  <body>
+    <script type="text/javascript">
+      var __pParams = __pParams || []
+      __pParams.push({
+        client_id: '468',
+        c_1: 'atcodercontest',
+        c_2: 'ClientSite'
+      })
+    </script>
+    <script
+      type="text/javascript"
+      src="https://cdn.d2-apps.net/js/tr.js"
+      async
+    ></script>
+
+    <div
+      id="modal-contest-start"
+      class="modal fade"
+      tabindex="-1"
+      role="dialog"
+    >
+      <div class="modal-dialog" role="document">
+        <div class="modal-content">
+          <div class="modal-header">
+            <button
+              type="button"
+              class="close"
+              data-dismiss="modal"
+              aria-label="Close"
+            >
+              <span aria-hidden="true">&times;</span>
+            </button>
+            <h4 class="modal-title">Contest started</h4>
+          </div>
+          <div class="modal-body">
+            <p>AtCoder Beginner Contest 100 has begun.</p>
+          </div>
+          <div class="modal-footer">
+            <button type="button" class="btn btn-default" data-dismiss="modal">
+              Close
+            </button>
+          </div>
+        </div>
+      </div>
+    </div>
+    <div id="modal-contest-end" class="modal fade" tabindex="-1" role="dialog">
+      <div class="modal-dialog" role="document">
+        <div class="modal-content">
+          <div class="modal-header">
+            <button
+              type="button"
+              class="close"
+              data-dismiss="modal"
+              aria-label="Close"
+            >
+              <span aria-hidden="true">&times;</span>
+            </button>
+            <h4 class="modal-title">Contest is over</h4>
+          </div>
+          <div class="modal-body">
+            <p>AtCoder Beginner Contest 100 has ended.</p>
+          </div>
+          <div class="modal-footer">
+            <button type="button" class="btn btn-default" data-dismiss="modal">
+              Close
+            </button>
+          </div>
+        </div>
+      </div>
+    </div>
+    <div id="main-div" class="float-container">
+      <nav class="navbar navbar-inverse navbar-fixed-top">
+        <div class="container-fluid">
+          <div class="navbar-header">
+            <button
+              type="button"
+              class="navbar-toggle collapsed"
+              data-toggle="collapse"
+              data-target="#navbar-collapse"
+              aria-expanded="false"
+            >
+              <span class="icon-bar"></span><span class="icon-bar"></span
+              ><span class="icon-bar"></span>
+            </button>
+            <a class="navbar-brand" href="/home"></a>
+          </div>
+          <div class="collapse navbar-collapse" id="navbar-collapse">
+            <ul class="nav navbar-nav">
+              <li>
+                <a class="contest-title" href="/contests/abc100"
+                  >AtCoder Beginner Contest 100</a
+                >
+              </li>
+            </ul>
+            <ul class="nav navbar-nav navbar-right">
+              <li class="dropdown">
+                <a
+                  class="dropdown-toggle"
+                  data-toggle="dropdown"
+                  href="#"
+                  role="button"
+                  aria-haspopup="true"
+                  aria-expanded="false"
+                >
+                  <img src="//img.atcoder.jp/assets/top/img/flag-lang/en.png" />
+                  English <span class="caret"></span>
+                </a>
+                <ul class="dropdown-menu">
+                  <li>
+                    <a href="/contests/abc100/tasks?lang=ja"
+                      ><img
+                        src="//img.atcoder.jp/assets/top/img/flag-lang/ja.png"
+                      />
+                      日本語</a
+                    >
+                  </li>
+                  <li>
+                    <a href="/contests/abc100/tasks?lang=en"
+                      ><img
+                        src="//img.atcoder.jp/assets/top/img/flag-lang/en.png"
+                      />
+                      English</a
+                    >
+                  </li>
+                </ul>
+              </li>
+
+              <li>
+                <a
+                  href="/register?continue=https%3A%2F%2Fatcoder.jp%2Fcontests%2Fabc100%2Ftasks"
+                  >Sign Up</a
+                >
+              </li>
+              <li>
+                <a
+                  href="/login?continue=https%3A%2F%2Fatcoder.jp%2Fcontests%2Fabc100%2Ftasks"
+                  >Sign In</a
+                >
+              </li>
+            </ul>
+          </div>
+        </div>
+      </nav>
+
+      <form
+        method="POST"
+        name="form_logout"
+        action="/logout?continue=https%3A%2F%2Fatcoder.jp%2Fcontests%2Fabc100%2Ftasks"
+      >
+        <input
+          type="hidden"
+          name="csrf_token"
+          value="q&#43;4tZ4tLQh/4nobcpVAuiml6OVEZOdZDZURhPenxPbc="
+        />
+      </form>
+      <div id="main-container" class="container" style="padding-top: 50px">
+        <div class="row">
+          <div id="contest-nav-tabs" class="col-sm-12 mb-2 cnvtb-fixed">
+            <div>
+              <small class="contest-duration">
+                Contest Duration:
+                <a
+                  href="http://www.timeanddate.com/worldclock/fixedtime.html?iso=20180616T2100&p1=248"
+                  target="blank"
+                  ><time class="fixtime fixtime-full"
+                    >2018-06-16 21:00:00+0900</time
+                  ></a
+                >
+                -
+                <a
+                  href="http://www.timeanddate.com/worldclock/fixedtime.html?iso=20180616T2240&p1=248"
+                  target="blank"
+                  ><time class="fixtime fixtime-full"
+                    >2018-06-16 22:40:00+0900</time
+                  ></a
+                >
+                (local time) (100 minutes)
+              </small>
+              <small class="back-to-home pull-right"
+                ><a href="/home">Back to Home</a></small
+              >
+            </div>
+            <ul class="nav nav-tabs">
+              <li>
+                <a href="/contests/abc100"
+                  ><span
+                    class="glyphicon glyphicon-home"
+                    aria-hidden="true"
+                  ></span>
+                  Top</a
+                >
+              </li>
+
+              <li class="active">
+                <a href="/contests/abc100/tasks"
+                  ><span
+                    class="glyphicon glyphicon-tasks"
+                    aria-hidden="true"
+                  ></span>
+                  Tasks</a
+                >
+              </li>
+
+              <li>
+                <a href="/contests/abc100/clarifications"
+                  ><span
+                    class="glyphicon glyphicon-question-sign"
+                    aria-hidden="true"
+                  ></span>
+                  Clarifications <span id="clar-badge" class="badge"></span
+                ></a>
+              </li>
+
+              <li>
+                <a
+                  class="dropdown-toggle"
+                  data-toggle="dropdown"
+                  href="#"
+                  role="button"
+                  aria-haspopup="true"
+                  aria-expanded="false"
+                  ><span
+                    class="glyphicon glyphicon-list"
+                    aria-hidden="true"
+                  ></span>
+                  Results<span class="caret"></span
+                ></a>
+                <ul class="dropdown-menu">
+                  <li>
+                    <a href="/contests/abc100/submissions"
+                      ><span
+                        class="glyphicon glyphicon-globe"
+                        aria-hidden="true"
+                      ></span>
+                      All Submissions</a
+                    >
+                  </li>
+                </ul>
+              </li>
+
+              <li>
+                <a href="/contests/abc100/standings"
+                  ><span
+                    class="glyphicon glyphicon-sort-by-attributes-alt"
+                    aria-hidden="true"
+                  ></span>
+                  Standings</a
+                >
+              </li>
+
+              <li>
+                <a href="/contests/abc100/standings/virtual"
+                  ><span
+                    class="glyphicon glyphicon-sort-by-attributes-alt"
+                    aria-hidden="true"
+                  ></span>
+                  Virtual Standings</a
+                >
+              </li>
+
+              <li>
+                <a href="/contests/abc100/editorial"
+                  ><span
+                    class="glyphicon glyphicon-book"
+                    aria-hidden="true"
+                  ></span>
+                  Editorial</a
+                >
+              </li>
+
+              <li class="pull-right">
+                <a id="fix-cnvtb" href="javascript:void(0)"
+                  ><span
+                    class="glyphicon glyphicon-pushpin"
+                    aria-hidden="true"
+                  ></span
+                ></a>
+              </li>
+            </ul>
+          </div>
+          <div class="col-sm-12">
+            <h2>Tasks</h2>
+            <hr />
+
+            <div class="panel panel-default table-responsive">
+              <table class="table table-bordered table-striped">
+                <thead>
+                  <tr>
+                    <th width="3%" class="text-center"></th>
+                    <th>Task Name</th>
+                    <th width="10%" class="text-right no-break">Time Limit</th>
+                    <th width="10%" class="text-right no-break">
+                      Memory Limit
+                    </th>
+                  </tr>
+                </thead>
+                <tbody>
+                  <tr>
+                    <td class="text-center no-break">
+                      <a href="/contests/abc100/tasks/abc100_a">A</a>
+                    </td>
+                    <td>
+                      <a href="/contests/abc100/tasks/abc100_a"
+                        >Happy Birthday!</a
+                      >
+                    </td>
+                    <td class="text-right">2 sec</td>
+                    <td class="text-right">976 MiB</td>
+                  </tr>
+
+                  <tr>
+                    <td class="text-center no-break">
+                      <a href="/contests/abc100/tasks/abc100_b">B</a>
+                    </td>
+                    <td>
+                      <a href="/contests/abc100/tasks/abc100_b"
+                        >Ringo&#39;s Favorite Numbers</a
+                      >
+                    </td>
+                    <td class="text-right">2 sec</td>
+                    <td class="text-right">976 MiB</td>
+                  </tr>
+
+                  <tr>
+                    <td class="text-center no-break">
+                      <a href="/contests/abc100/tasks/abc100_c">C</a>
+                    </td>
+                    <td>
+                      <a href="/contests/abc100/tasks/abc100_c">*3 or /2</a>
+                    </td>
+                    <td class="text-right">2 sec</td>
+                    <td class="text-right">976 MiB</td>
+                  </tr>
+
+                  <tr>
+                    <td class="text-center no-break">
+                      <a href="/contests/abc100/tasks/abc100_d">D</a>
+                    </td>
+                    <td>
+                      <a href="/contests/abc100/tasks/abc100_d"
+                        >Patisserie ABC</a
+                      >
+                    </td>
+                    <td class="text-right">2 sec</td>
+                    <td class="text-right">976 MiB</td>
+                  </tr>
+                </tbody>
+              </table>
+            </div>
+
+            <p class="btn-text-group">
+              <a class="btn-text" href="/contests/abc100/tasks_print"
+                >Tasks for printing</a
+              >
+            </p>
+          </div>
+        </div>
+
+        <hr />
+
+        <div
+          class="a2a_kit a2a_kit_size_20 a2a_default_style pull-right"
+          data-a2a-url="https://atcoder.jp/contests/abc100/tasks?lang=en"
+          data-a2a-title="Tasks - AtCoder Beginner Contest 100"
+        >
+          <a class="a2a_button_facebook"></a>
+          <a class="a2a_button_twitter"></a>
+
+          <a class="a2a_button_telegram"></a>
+
+          <a class="a2a_dd" href="https://www.addtoany.com/share"></a>
+        </div>
+
+        <script async src="//static.addtoany.com/menu/page.js"></script>
+      </div>
+      <hr />
+    </div>
+
+    <div class="container" style="margin-bottom: 80px">
+      <footer class="footer">
+        <ul>
+          <li><a href="/contests/abc100/rules">Rule</a></li>
+          <li><a href="/contests/abc100/glossary">Glossary</a></li>
+        </ul>
+
+        <ul>
+          <li><a href="/tos">Terms of service</a></li>
+          <li><a href="/privacy">Privacy Policy</a></li>
+          <li><a href="/personal">Information Protection Policy</a></li>
+          <li><a href="/company">Company</a></li>
+          <li><a href="/faq">FAQ</a></li>
+          <li><a href="/contact">Contact</a></li>
+        </ul>
+        <div class="text-center">
+          <small id="copyright"
+            >Copyright Since 2012 &copy;<a href="http://atcoder.co.jp"
+              >AtCoder Inc.</a
+            >
+            All rights reserved.</small
+          >
+        </div>
+      </footer>
+    </div>
+    <p id="fixed-server-timer" class="contest-timer"></p>
+    <div id="scroll-page-top" style="display: none">
+      <span class="glyphicon glyphicon-arrow-up" aria-hidden="true"></span> Page
+      Top
+    </div>
+  </body>
+</html>

tests/fixtures/atcoder_task_abc100_a.html

@@ -0,0 +1,885 @@
+<!doctype html>
+<html>
+  <head>
+    <title>A - Happy Birthday!</title>
+    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
+    <meta http-equiv="Content-Language" content="en" />
+    <meta name="viewport" content="width=device-width,initial-scale=1.0" />
+    <meta name="format-detection" content="telephone=no" />
+    <meta
+      name="google-site-verification"
+      content="nXGC_JxO0yoP1qBzMnYD_xgufO6leSLw1kyNo2HZltM"
+    />
+
+    <script
+      async
+      src="https://www.googletagmanager.com/gtag/js?id=G-RC512FD18N"
+    ></script>
+    <script>
+      window.dataLayer = window.dataLayer || []
+      function gtag() {
+        dataLayer.push(arguments)
+      }
+      gtag('js', new Date())
+      gtag('set', 'user_properties', {
+        login_status: 'logged_out'
+      })
+      gtag('config', 'G-RC512FD18N')
+    </script>
+
+    <meta
+      name="description"
+      content="AtCoder is a programming contest site for anyone from beginners to experts. We hold weekly programming contests online."
+    />
+    <meta name="author" content="AtCoder Inc." />
+
+    <meta property="og:site_name" content="AtCoder" />
+
+    <meta property="og:title" content="A - Happy Birthday!" />
+    <meta
+      property="og:description"
+      content="AtCoder is a programming contest site for anyone from beginners to experts. We hold weekly programming contests online."
+    />
+    <meta property="og:type" content="website" />
+    <meta
+      property="og:url"
+      content="https://atcoder.jp/contests/abc100/tasks/abc100_a"
+    />
+    <meta
+      property="og:image"
+      content="https://img.atcoder.jp/assets/atcoder.png"
+    />
+    <meta name="twitter:card" content="summary" />
+    <meta name="twitter:site" content="@atcoder" />
+
+    <meta property="twitter:title" content="A - Happy Birthday!" />
+
+    <link
+      href="//fonts.googleapis.com/css?family=Lato:400,700"
+      rel="stylesheet"
+      type="text/css"
+    />
+    <link
+      rel="stylesheet"
+      type="text/css"
+      href="//img.atcoder.jp/public/6372bb3/css/bootstrap.min.css"
+    />
+    <link
+      rel="stylesheet"
+      type="text/css"
+      href="//img.atcoder.jp/public/6372bb3/css/base.css"
+    />
+    <link
+      rel="shortcut icon"
+      type="image/png"
+      href="//img.atcoder.jp/assets/favicon.png"
+    />
+    <link rel="apple-touch-icon" href="//img.atcoder.jp/assets/atcoder.png" />
+    <script src="//img.atcoder.jp/public/6372bb3/js/lib/jquery-1.9.1.min.js"></script>
+    <script src="//img.atcoder.jp/public/6372bb3/js/lib/bootstrap.min.js"></script>
+    <script src="//img.atcoder.jp/public/6372bb3/js/cdn/js.cookie.min.js"></script>
+    <script src="//img.atcoder.jp/public/6372bb3/js/cdn/moment.min.js"></script>
+    <script src="//img.atcoder.jp/public/6372bb3/js/cdn/moment_js-ja.js"></script>
+    <script>
+      var LANG = 'en'
+      var userScreenName = ''
+      var csrfToken = 'IHvNJXcA2LTFdl1UlqkJVdhRBg/6RvcHG1jLWfRmR44='
+    </script>
+    <script src="//img.atcoder.jp/public/6372bb3/js/utils.js"></script>
+
+    <script src="//img.atcoder.jp/public/6372bb3/js/contest.js"></script>
+    <link
+      href="//img.atcoder.jp/public/6372bb3/css/contest.css"
+      rel="stylesheet"
+    />
+    <script>
+      var contestScreenName = 'abc100'
+      var remainingText = 'Remaining Time'
+      var countDownText = 'Contest begins in'
+      var startTime = moment('2018-06-16T21:00:00+09:00')
+      var endTime = moment('2018-06-16T22:40:00+09:00')
+    </script>
+    <style></style>
+
+    <link
+      href="//img.atcoder.jp/public/6372bb3/css/cdn/select2.min.css"
+      rel="stylesheet"
+    />
+    <link
+      href="//img.atcoder.jp/public/6372bb3/css/cdn/select2-bootstrap.min.css"
+      rel="stylesheet"
+    />
+    <script src="//img.atcoder.jp/public/6372bb3/js/lib/select2.min.js"></script>
+
+    <script src="//img.atcoder.jp/public/6372bb3/js/ace/ace.js"></script>
+    <script src="//img.atcoder.jp/public/6372bb3/js/ace/ext-language_tools.js"></script>
+
+    <script src="//img.atcoder.jp/public/6372bb3/js/cdn/run_prettify.js"></script>
+
+    <link
+      rel="stylesheet"
+      href="//img.atcoder.jp/public/6372bb3/css/cdn/katex.min.css"
+    />
+    <script
+      defer
+      src="//img.atcoder.jp/public/6372bb3/js/cdn/katex.min.js"
+    ></script>
+    <script
+      defer
+      src="//img.atcoder.jp/public/6372bb3/js/cdn/auto-render.min.js"
+    ></script>
+    <script>
+      $(function () {
+        $('var').each(function () {
+          var html = $(this)
+            .html()
+            .replace(/<sub>/g, '_{')
+            .replace(/<\/sub>/g, '}')
+          $(this).html('\\(' + html + '\\)')
+        })
+      })
+    </script>
+    <script>
+      var katexOptions = {
+        delimiters: [
+          { left: '$$', right: '$$', display: true },
+
+          { left: '\\(', right: '\\)', display: false },
+          { left: '\\[', right: '\\]', display: true }
+        ],
+        ignoredTags: [
+          'script',
+          'noscript',
+          'style',
+          'textarea',
+          'code',
+          'option'
+        ],
+        ignoredClasses: ['prettyprint', 'source-code-for-copy'],
+        throwOnError: false
+      }
+      document.addEventListener('DOMContentLoaded', function () {
+        renderMathInElement(document.body, katexOptions)
+      })
+    </script>
+
+    <script src="//img.atcoder.jp/public/6372bb3/js/base.js"></script>
+  </head>
+
+  <body>
+    <script type="text/javascript">
+      var __pParams = __pParams || []
+      __pParams.push({
+        client_id: '468',
+        c_1: 'atcodercontest',
+        c_2: 'ClientSite'
+      })
+    </script>
+    <script
+      type="text/javascript"
+      src="https://cdn.d2-apps.net/js/tr.js"
+      async
+    ></script>
+
+    <div
+      id="modal-contest-start"
+      class="modal fade"
+      tabindex="-1"
+      role="dialog"
+    >
+      <div class="modal-dialog" role="document">
+        <div class="modal-content">
+          <div class="modal-header">
+            <button
+              type="button"
+              class="close"
+              data-dismiss="modal"
+              aria-label="Close"
+            >
+              <span aria-hidden="true">&times;</span>
+            </button>
+            <h4 class="modal-title">Contest started</h4>
+          </div>
+          <div class="modal-body">
+            <p>AtCoder Beginner Contest 100 has begun.</p>
+          </div>
+          <div class="modal-footer">
+            <button type="button" class="btn btn-default" data-dismiss="modal">
+              Close
+            </button>
+          </div>
+        </div>
+      </div>
+    </div>
+    <div id="modal-contest-end" class="modal fade" tabindex="-1" role="dialog">
+      <div class="modal-dialog" role="document">
+        <div class="modal-content">
+          <div class="modal-header">
+            <button
+              type="button"
+              class="close"
+              data-dismiss="modal"
+              aria-label="Close"
+            >
+              <span aria-hidden="true">&times;</span>
+            </button>
+            <h4 class="modal-title">Contest is over</h4>
+          </div>
+          <div class="modal-body">
+            <p>AtCoder Beginner Contest 100 has ended.</p>
+          </div>
+          <div class="modal-footer">
+            <button type="button" class="btn btn-default" data-dismiss="modal">
+              Close
+            </button>
+          </div>
+        </div>
+      </div>
+    </div>
+    <div id="main-div" class="float-container">
+      <nav class="navbar navbar-inverse navbar-fixed-top">
+        <div class="container-fluid">
+          <div class="navbar-header">
+            <button
+              type="button"
+              class="navbar-toggle collapsed"
+              data-toggle="collapse"
+              data-target="#navbar-collapse"
+              aria-expanded="false"
+            >
+              <span class="icon-bar"></span><span class="icon-bar"></span
+              ><span class="icon-bar"></span>
+            </button>
+            <a class="navbar-brand" href="/home"></a>
+          </div>
+          <div class="collapse navbar-collapse" id="navbar-collapse">
+            <ul class="nav navbar-nav">
+              <li>
+                <a class="contest-title" href="/contests/abc100"
+                  >AtCoder Beginner Contest 100</a
+                >
+              </li>
+            </ul>
+            <ul class="nav navbar-nav navbar-right">
+              <li class="dropdown">
+                <a
+                  class="dropdown-toggle"
+                  data-toggle="dropdown"
+                  href="#"
+                  role="button"
+                  aria-haspopup="true"
+                  aria-expanded="false"
+                >
+                  <img src="//img.atcoder.jp/assets/top/img/flag-lang/en.png" />
+                  English <span class="caret"></span>
+                </a>
+                <ul class="dropdown-menu">
+                  <li>
+                    <a href="/contests/abc100/tasks/abc100_a?lang=ja"
+                      ><img
+                        src="//img.atcoder.jp/assets/top/img/flag-lang/ja.png"
+                      />
+                      日本語</a
+                    >
+                  </li>
+                  <li>
+                    <a href="/contests/abc100/tasks/abc100_a?lang=en"
+                      ><img
+                        src="//img.atcoder.jp/assets/top/img/flag-lang/en.png"
+                      />
+                      English</a
+                    >
+                  </li>
+                </ul>
+              </li>
+
+              <li>
+                <a
+                  href="/register?continue=https%3A%2F%2Fatcoder.jp%2Fcontests%2Fabc100%2Ftasks%2Fabc100_a"
+                  >Sign Up</a
+                >
+              </li>
+              <li>
+                <a
+                  href="/login?continue=https%3A%2F%2Fatcoder.jp%2Fcontests%2Fabc100%2Ftasks%2Fabc100_a"
+                  >Sign In</a
+                >
+              </li>
+            </ul>
+          </div>
+        </div>
+      </nav>
+
+      <form
+        method="POST"
+        name="form_logout"
+        action="/logout?continue=https%3A%2F%2Fatcoder.jp%2Fcontests%2Fabc100%2Ftasks%2Fabc100_a"
+      >
+        <input
+          type="hidden"
+          name="csrf_token"
+          value="IHvNJXcA2LTFdl1UlqkJVdhRBg/6RvcHG1jLWfRmR44="
+        />
+      </form>
+      <div id="main-container" class="container" style="padding-top: 50px">
+        <div class="row">
+          <div id="contest-nav-tabs" class="col-sm-12 mb-2 cnvtb-fixed">
+            <div>
+              <small class="contest-duration">
+                Contest Duration:
+                <a
+                  href="http://www.timeanddate.com/worldclock/fixedtime.html?iso=20180616T2100&p1=248"
+                  target="blank"
+                  ><time class="fixtime fixtime-full"
+                    >2018-06-16 21:00:00+0900</time
+                  ></a
+                >
+                -
+                <a
+                  href="http://www.timeanddate.com/worldclock/fixedtime.html?iso=20180616T2240&p1=248"
+                  target="blank"
+                  ><time class="fixtime fixtime-full"
+                    >2018-06-16 22:40:00+0900</time
+                  ></a
+                >
+                (local time) (100 minutes)
+              </small>
+              <small class="back-to-home pull-right"
+                ><a href="/home">Back to Home</a></small
+              >
+            </div>
+            <ul class="nav nav-tabs">
+              <li>
+                <a href="/contests/abc100"
+                  ><span
+                    class="glyphicon glyphicon-home"
+                    aria-hidden="true"
+                  ></span>
+                  Top</a
+                >
+              </li>
+
+              <li class="active">
+                <a href="/contests/abc100/tasks"
+                  ><span
+                    class="glyphicon glyphicon-tasks"
+                    aria-hidden="true"
+                  ></span>
+                  Tasks</a
+                >
+              </li>
+
+              <li>
+                <a href="/contests/abc100/clarifications"
+                  ><span
+                    class="glyphicon glyphicon-question-sign"
+                    aria-hidden="true"
+                  ></span>
+                  Clarifications <span id="clar-badge" class="badge"></span
+                ></a>
+              </li>
+
+              <li>
+                <a
+                  class="dropdown-toggle"
+                  data-toggle="dropdown"
+                  href="#"
+                  role="button"
+                  aria-haspopup="true"
+                  aria-expanded="false"
+                  ><span
+                    class="glyphicon glyphicon-list"
+                    aria-hidden="true"
+                  ></span>
+                  Results<span class="caret"></span
+                ></a>
+                <ul class="dropdown-menu">
+                  <li>
+                    <a href="/contests/abc100/submissions"
+                      ><span
+                        class="glyphicon glyphicon-globe"
+                        aria-hidden="true"
+                      ></span>
+                      All Submissions</a
+                    >
+                  </li>
+                </ul>
+              </li>
+
+              <li>
+                <a href="/contests/abc100/standings"
+                  ><span
+                    class="glyphicon glyphicon-sort-by-attributes-alt"
+                    aria-hidden="true"
+                  ></span>
+                  Standings</a
+                >
+              </li>
+
+              <li>
+                <a href="/contests/abc100/standings/virtual"
+                  ><span
+                    class="glyphicon glyphicon-sort-by-attributes-alt"
+                    aria-hidden="true"
+                  ></span>
+                  Virtual Standings</a
+                >
+              </li>
+
+              <li>
+                <a href="/contests/abc100/editorial"
+                  ><span
+                    class="glyphicon glyphicon-book"
+                    aria-hidden="true"
+                  ></span>
+                  Editorial</a
+                >
+              </li>
+
+              <li class="pull-right">
+                <a id="fix-cnvtb" href="javascript:void(0)"
+                  ><span
+                    class="glyphicon glyphicon-pushpin"
+                    aria-hidden="true"
+                  ></span
+                ></a>
+              </li>
+            </ul>
+          </div>
+          <div class="col-sm-12">
+            <span class="h2">
+              A - Happy Birthday!
+              <a
+                class="btn btn-default btn-sm"
+                href="/contests/abc100/tasks/abc100_a/editorial"
+                >Editorial</a
+              >
+            </span>
+            <span id="task-lang-btn" class="pull-right"
+              ><span data-lang="ja"
+                ><img src="//img.atcoder.jp/assets/top/img/flag-lang/ja.png"
+              /></span>
+              /
+              <span data-lang="en"
+                ><img
+                  src="//img.atcoder.jp/assets/top/img/flag-lang/en.png" /></span
+            ></span>
+            <script>
+              $(function () {
+                var ts = $('#task-statement span.lang')
+                if (ts.children('span').size() <= 1) {
+                  $('#task-lang-btn').hide()
+                  ts.children('span').show()
+                  return
+                }
+
+                var REMEMBER_LB = 5
+                var LS_KEY = 'task_lang'
+                var taskLang = getLS(LS_KEY) || ''
+                function isTaskLangSet(taskLang) {
+                  return taskLang === 'ja' || taskLang === 'en'
+                }
+                if (isTaskLangSet(taskLang)) {
+                  const params = new URLSearchParams(window.location.search)
+                  if (params.get('lang')) {
+                    setLS(LS_KEY, REMEMBER_LB)
+                    taskLang = LANG
+                  }
+                } else {
+                  taskLang = LANG
+                }
+                ts.children('span.lang-' + taskLang).show()
+
+                $('#task-lang-btn span').click(function () {
+                  var l = $(this).data('lang')
+                  ts.children('span').hide()
+                  ts.children('span.lang-' + l).show()
+
+                  taskLang = getLS(LS_KEY) || ''
+                  let changeTimes = 0
+                  if (isTaskLangSet(taskLang)) {
+                    changeTimes = REMEMBER_LB
+                  } else {
+                    changeTimes = parseInt(taskLang, 10)
+                    if (isNaN(changeTimes)) changeTimes = 0
+                    changeTimes++
+                  }
+                  if (changeTimes < REMEMBER_LB) setLS(LS_KEY, changeTimes)
+                  else setLS(LS_KEY, l)
+                })
+              })
+            </script>
+            <hr />
+            <p>Time Limit: 2 sec / Memory Limit: 976 MiB</p>
+
+            <div id="task-statement">
+              <span class="lang">
+                <span class="lang-ja">
+                  <p>配点: <var>100</var> 点</p>
+
+                  <div class="part">
+                    <section>
+                      <h3>問題文</h3>
+                      <p>
+                        もうすぐ E869120 君と square1001 君の
+                        <var>16</var> 才の誕生日が来る.<br />
+                        そこで, AtCoder 王国の高橋君は, 円形のケーキ
+                        <var>1</var> 個に放射状に切れ目を入れ
+                        <var>16</var> 等分したものを, 彼らにプレゼントした.
+                      </p>
+                      <p>
+                        E869120 君はそのうち <var>A</var> 切れ、square1001 君は
+                        <var>B</var> 切れを食べようとした.<br />
+                        しかし, ケーキと一緒についていた紙を見ると,
+                        「同じ人が隣り合う
+                        <var>2</var>
+                        切れのケーキを両方取ってはならない」と書かれていた.
+                      </p>
+                      <p>
+                        さて、彼らは紙に書かれたことを守って、<var>2</var>
+                        人とも食べたい数のケーキを取ることができるだろうか？
+                      </p>
+                    </section>
+                  </div>
+
+                  <div class="part">
+                    <section>
+                      <h3>制約</h3>
+                      <ul>
+                        <li>
+                          <var>A, B</var> は <var>1</var> 以上
+                          <var>16</var> 以下の整数
+                        </li>
+                        <li><var>A+B</var> は <var>16</var> 以下である.</li>
+                      </ul>
+                    </section>
+                  </div>
+
+                  <hr />
+
+                  <div class="io-style">
+                    <div class="part">
+                      <section>
+                        <h3>入力</h3>
+                        <p>入力は以下の形式で標準入力から与えられる.</p>
+                        <pre><var>A</var> <var>B</var>
+</pre>
+                      </section>
+                    </div>
+
+                    <div class="part">
+                      <section>
+                        <h3>出力</h3>
+                        <p>
+                          紙に書かれたことを守って, E869120 君と square1001
+                          君両方が, 食べたい数のケーキを取ることができるならば
+                          <code>Yay!</code>, そうでなければ
+                          <code>:(</code> と出力しなさい.
+                        </p>
+                      </section>
+                    </div>
+                  </div>
+
+                  <hr />
+
+                  <div class="part">
+                    <section>
+                      <h3>入力例 1</h3>
+                      <pre>
+5 4
+</pre
+                      >
+                    </section>
+                  </div>
+
+                  <div class="part">
+                    <section>
+                      <h3>出力例 1</h3>
+                      <pre>
+Yay!
+</pre
+                      >
+
+                      <p>
+                        下の図のようにケーキを取れば、<var>2</var>
+                        人とも目標を達成することができる.<br />
+                        <img
+                          alt=" "
+                          src="https://img.atcoder.jp/abc100/e87fa456a900ac9ae36671ae8bd5eeea.png"
+                        />
+                      </p>
+                    </section>
+                  </div>
+
+                  <hr />
+
+                  <div class="part">
+                    <section>
+                      <h3>入力例 2</h3>
+                      <pre>
+8 8
+</pre
+                      >
+                    </section>
+                  </div>
+
+                  <div class="part">
+                    <section>
+                      <h3>出力例 2</h3>
+                      <pre>
+Yay!
+</pre
+                      >
+
+                      <p>
+                        下の図のようにケーキを取れば、<var>2</var>
+                        人とも目標を達成することができる.<br />
+                        <img
+                          alt=" "
+                          src="https://img.atcoder.jp/abc100/a7989ac033e6ba86e14078864c20d9c5.png"
+                        />
+                      </p>
+                    </section>
+                  </div>
+
+                  <hr />
+
+                  <div class="part">
+                    <section>
+                      <h3>入力例 3</h3>
+                      <pre>
+11 4
+</pre
+                      >
+                    </section>
+                  </div>
+
+                  <div class="part">
+                    <section>
+                      <h3>出力例 3</h3>
+                      <pre>
+:(
+</pre
+                      >
+
+                      <p>
+                        この場合, 残念ながら目標を達成する方法は
+                        <var>1</var> つもない.
+                      </p>
+                    </section>
+                  </div>
+                </span>
+                <span class="lang-en">
+                  <p>Score: <var>100</var> points</p>
+
+                  <div class="part">
+                    <section>
+                      <h3>Problem Statement</h3>
+                      <p>
+                        E869120's and square1001's <var>16</var>-th birthday is
+                        coming soon.<br />
+                        Takahashi from AtCoder Kingdom gave them a round cake
+                        cut into <var>16</var> equal fan-shaped pieces.
+                      </p>
+                      <p>
+                        E869120 and square1001 were just about to eat
+                        <var>A</var> and <var>B</var> of those pieces,
+                        respectively,<br />
+                        when they found a note attached to the cake saying that
+                        "the same person should not take two adjacent pieces of
+                        cake".
+                      </p>
+                      <p>
+                        Can both of them obey the instruction in the note and
+                        take desired numbers of pieces of cake?
+                      </p>
+                    </section>
+                  </div>
+
+                  <div class="part">
+                    <section>
+                      <h3>Constraints</h3>
+                      <ul>
+                        <li>
+                          <var>A</var> and <var>B</var> are integers between
+                          <var>1</var> and <var>16</var> (inclusive).
+                        </li>
+                        <li><var>A+B</var> is at most <var>16</var>.</li>
+                      </ul>
+                    </section>
+                  </div>
+
+                  <hr />
+
+                  <div class="io-style">
+                    <div class="part">
+                      <section>
+                        <h3>Input</h3>
+                        <p>
+                          Input is given from Standard Input in the following
+                          format:
+                        </p>
+                        <pre><var>A</var> <var>B</var>
+</pre>
+                      </section>
+                    </div>
+
+                    <div class="part">
+                      <section>
+                        <h3>Output</h3>
+                        <p>
+                          If both E869120 and square1001 can obey the
+                          instruction in the note and take desired numbers of
+                          pieces of cake, print <code>Yay!</code>; otherwise,
+                          print <code>:(</code>.
+                        </p>
+                      </section>
+                    </div>
+                  </div>
+
+                  <hr />
+
+                  <div class="part">
+                    <section>
+                      <h3>Sample Input 1</h3>
+                      <pre>
+5 4
+</pre
+                      >
+                    </section>
+                  </div>
+
+                  <div class="part">
+                    <section>
+                      <h3>Sample Output 1</h3>
+                      <pre>
+Yay!
+</pre
+                      >
+
+                      <p>
+                        Both of them can take desired number of pieces as
+                        follows:
+                        <img
+                          alt=" "
+                          src="https://img.atcoder.jp/abc100/e87fa456a900ac9ae36671ae8bd5eeea.png"
+                        />
+                      </p>
+                    </section>
+                  </div>
+
+                  <hr />
+
+                  <div class="part">
+                    <section>
+                      <h3>Sample Input 2</h3>
+                      <pre>
+8 8
+</pre
+                      >
+                    </section>
+                  </div>
+
+                  <div class="part">
+                    <section>
+                      <h3>Sample Output 2</h3>
+                      <pre>
+Yay!
+</pre
+                      >
+
+                      <p>
+                        Both of them can take desired number of pieces as
+                        follows:
+                        <img
+                          alt=" "
+                          src="https://img.atcoder.jp/abc100/a7989ac033e6ba86e14078864c20d9c5.png"
+                        />
+                      </p>
+                    </section>
+                  </div>
+
+                  <hr />
+
+                  <div class="part">
+                    <section>
+                      <h3>Sample Input 3</h3>
+                      <pre>
+11 4
+</pre
+                      >
+                    </section>
+                  </div>
+
+                  <div class="part">
+                    <section>
+                      <h3>Sample Output 3</h3>
+                      <pre>
+:(
+</pre
+                      >
+
+                      <p>
+                        In this case, there is no way for them to take desired
+                        number of pieces, unfortunately.
+                      </p>
+                    </section>
+                  </div>
+                </span>
+              </span>
+            </div>
+          </div>
+        </div>
+
+        <hr />
+
+        <div
+          class="a2a_kit a2a_kit_size_20 a2a_default_style pull-right"
+          data-a2a-url="https://atcoder.jp/contests/abc100/tasks/abc100_a?lang=en"
+          data-a2a-title="A - Happy Birthday!"
+        >
+          <a class="a2a_button_facebook"></a>
+          <a class="a2a_button_twitter"></a>
+
+          <a class="a2a_button_telegram"></a>
+
+          <a class="a2a_dd" href="https://www.addtoany.com/share"></a>
+        </div>
+
+        <script async src="//static.addtoany.com/menu/page.js"></script>
+      </div>
+      <hr />
+    </div>
+
+    <div class="container" style="margin-bottom: 80px">
+      <footer class="footer">
+        <ul>
+          <li><a href="/contests/abc100/rules">Rule</a></li>
+          <li><a href="/contests/abc100/glossary">Glossary</a></li>
+        </ul>
+
+        <ul>
+          <li><a href="/tos">Terms of service</a></li>
+          <li><a href="/privacy">Privacy Policy</a></li>
+          <li><a href="/personal">Information Protection Policy</a></li>
+          <li><a href="/company">Company</a></li>
+          <li><a href="/faq">FAQ</a></li>
+          <li><a href="/contact">Contact</a></li>
+        </ul>
+        <div class="text-center">
+          <small id="copyright"
+            >Copyright Since 2012 &copy;<a href="http://atcoder.co.jp"
+              >AtCoder Inc.</a
+            >
+            All rights reserved.</small
+          >
+        </div>
+      </footer>
+    </div>
+    <p id="fixed-server-timer" class="contest-timer"></p>
+    <div id="scroll-page-top" style="display: none">
+      <span class="glyphicon glyphicon-arrow-up" aria-hidden="true"></span> Page
+      Top
+    </div>
+  </body>
+</html>

tests/fixtures/atcoder_task_abc100_b.html

@@ -0,0 +1,887 @@
+<!doctype html>
+<html>
+  <head>
+    <title>B - Ringo&#39;s Favorite Numbers</title>
+    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
+    <meta http-equiv="Content-Language" content="en" />
+    <meta name="viewport" content="width=device-width,initial-scale=1.0" />
+    <meta name="format-detection" content="telephone=no" />
+    <meta
+      name="google-site-verification"
+      content="nXGC_JxO0yoP1qBzMnYD_xgufO6leSLw1kyNo2HZltM"
+    />
+
+    <script
+      async
+      src="https://www.googletagmanager.com/gtag/js?id=G-RC512FD18N"
+    ></script>
+    <script>
+      window.dataLayer = window.dataLayer || []
+      function gtag() {
+        dataLayer.push(arguments)
+      }
+      gtag('js', new Date())
+      gtag('set', 'user_properties', {
+        login_status: 'logged_out'
+      })
+      gtag('config', 'G-RC512FD18N')
+    </script>
+
+    <meta
+      name="description"
+      content="AtCoder is a programming contest site for anyone from beginners to experts. We hold weekly programming contests online."
+    />
+    <meta name="author" content="AtCoder Inc." />
+
+    <meta property="og:site_name" content="AtCoder" />
+
+    <meta property="og:title" content="B - Ringo&#39;s Favorite Numbers" />
+    <meta
+      property="og:description"
+      content="AtCoder is a programming contest site for anyone from beginners to experts. We hold weekly programming contests online."
+    />
+    <meta property="og:type" content="website" />
+    <meta
+      property="og:url"
+      content="https://atcoder.jp/contests/abc100/tasks/abc100_b"
+    />
+    <meta
+      property="og:image"
+      content="https://img.atcoder.jp/assets/atcoder.png"
+    />
+    <meta name="twitter:card" content="summary" />
+    <meta name="twitter:site" content="@atcoder" />
+
+    <meta property="twitter:title" content="B - Ringo&#39;s Favorite Numbers" />
+
+    <link
+      href="//fonts.googleapis.com/css?family=Lato:400,700"
+      rel="stylesheet"
+      type="text/css"
+    />
+    <link
+      rel="stylesheet"
+      type="text/css"
+      href="//img.atcoder.jp/public/6372bb3/css/bootstrap.min.css"
+    />
+    <link
+      rel="stylesheet"
+      type="text/css"
+      href="//img.atcoder.jp/public/6372bb3/css/base.css"
+    />
+    <link
+      rel="shortcut icon"
+      type="image/png"
+      href="//img.atcoder.jp/assets/favicon.png"
+    />
+    <link rel="apple-touch-icon" href="//img.atcoder.jp/assets/atcoder.png" />
+    <script src="//img.atcoder.jp/public/6372bb3/js/lib/jquery-1.9.1.min.js"></script>
+    <script src="//img.atcoder.jp/public/6372bb3/js/lib/bootstrap.min.js"></script>
+    <script src="//img.atcoder.jp/public/6372bb3/js/cdn/js.cookie.min.js"></script>
+    <script src="//img.atcoder.jp/public/6372bb3/js/cdn/moment.min.js"></script>
+    <script src="//img.atcoder.jp/public/6372bb3/js/cdn/moment_js-ja.js"></script>
+    <script>
+      var LANG = 'en'
+      var userScreenName = ''
+      var csrfToken = 'o2ayF7Lv34NtRIbcb0Ixvog2CrZtUEVLZNKuIuHQKH8='
+    </script>
+    <script src="//img.atcoder.jp/public/6372bb3/js/utils.js"></script>
+
+    <script src="//img.atcoder.jp/public/6372bb3/js/contest.js"></script>
+    <link
+      href="//img.atcoder.jp/public/6372bb3/css/contest.css"
+      rel="stylesheet"
+    />
+    <script>
+      var contestScreenName = 'abc100'
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+                >
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+
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+                <a href="/contests/abc100/standings/virtual"
+                  ><span
+                    class="glyphicon glyphicon-sort-by-attributes-alt"
+                    aria-hidden="true"
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+                  Virtual Standings</a
+                >
+              </li>
+
+              <li>
+                <a href="/contests/abc100/editorial"
+                  ><span
+                    class="glyphicon glyphicon-book"
+                    aria-hidden="true"
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+                  Editorial</a
+                >
+              </li>
+
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+                <a id="fix-cnvtb" href="javascript:void(0)"
+                  ><span
+                    class="glyphicon glyphicon-pushpin"
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+                  ></span
+                ></a>
+              </li>
+            </ul>
+          </div>
+          <div class="col-sm-12">
+            <span class="h2">
+              B - Ringo&#39;s Favorite Numbers
+              <a
+                class="btn btn-default btn-sm"
+                href="/contests/abc100/tasks/abc100_b/editorial"
+                >Editorial</a
+              >
+            </span>
+            <span id="task-lang-btn" class="pull-right"
+              ><span data-lang="ja"
+                ><img src="//img.atcoder.jp/assets/top/img/flag-lang/ja.png"
+              /></span>
+              /
+              <span data-lang="en"
+                ><img
+                  src="//img.atcoder.jp/assets/top/img/flag-lang/en.png" /></span
+            ></span>
+            <script>
+              $(function () {
+                var ts = $('#task-statement span.lang')
+                if (ts.children('span').size() <= 1) {
+                  $('#task-lang-btn').hide()
+                  ts.children('span').show()
+                  return
+                }
+
+                var REMEMBER_LB = 5
+                var LS_KEY = 'task_lang'
+                var taskLang = getLS(LS_KEY) || ''
+                function isTaskLangSet(taskLang) {
+                  return taskLang === 'ja' || taskLang === 'en'
+                }
+                if (isTaskLangSet(taskLang)) {
+                  const params = new URLSearchParams(window.location.search)
+                  if (params.get('lang')) {
+                    setLS(LS_KEY, REMEMBER_LB)
+                    taskLang = LANG
+                  }
+                } else {
+                  taskLang = LANG
+                }
+                ts.children('span.lang-' + taskLang).show()
+
+                $('#task-lang-btn span').click(function () {
+                  var l = $(this).data('lang')
+                  ts.children('span').hide()
+                  ts.children('span.lang-' + l).show()
+
+                  taskLang = getLS(LS_KEY) || ''
+                  let changeTimes = 0
+                  if (isTaskLangSet(taskLang)) {
+                    changeTimes = REMEMBER_LB
+                  } else {
+                    changeTimes = parseInt(taskLang, 10)
+                    if (isNaN(changeTimes)) changeTimes = 0
+                    changeTimes++
+                  }
+                  if (changeTimes < REMEMBER_LB) setLS(LS_KEY, changeTimes)
+                  else setLS(LS_KEY, l)
+                })
+              })
+            </script>
+            <hr />
+            <p>Time Limit: 2 sec / Memory Limit: 976 MiB</p>
+
+            <div id="task-statement">
+              <span class="lang">
+                <span class="lang-ja">
+                  <p>配点: <var>200</var> 点</p>
+
+                  <div class="part">
+                    <section>
+                      <h3>問題文</h3>
+                      <p>
+                        今日は, 記念すべき AtCoder Beginner Contest 100
+                        が開催される. そのため, 高橋君はりんごさんに,
+                        ある整数をプレゼントしようと思った.<br />
+                        今日のコンテストは「AtCoder Beginner Contest
+                        100」なので, りんごさんは <var>100</var> で
+                        <strong>ちょうど</strong>
+                        <var>D</var>
+                        回割りきれる正の整数をプレゼントされると喜ぶ.
+                      </p>
+                      <p>
+                        さて, りんごさんがプレゼントされると喜ぶような整数のうち
+                        <var>N</var> 番目に小さいものを求めなさい.
+                      </p>
+                    </section>
+                  </div>
+
+                  <div class="part">
+                    <section>
+                      <h3>制約</h3>
+                      <ul>
+                        <li>
+                          <var>D</var> は <var>0, 1, 2</var> のいずれかである
+                        </li>
+                        <li>
+                          <var>N</var> は <var>1</var> 以上
+                          <var>100</var> 以下の整数
+                        </li>
+                      </ul>
+                    </section>
+                  </div>
+
+                  <hr />
+
+                  <div class="io-style">
+                    <div class="part">
+                      <section>
+                        <h3>入力</h3>
+                        <p>入力は以下の形式で標準入力から与えられる.</p>
+                        <pre><var>D</var> <var>N</var>
+</pre>
+                      </section>
+                    </div>
+
+                    <div class="part">
+                      <section>
+                        <h3>出力</h3>
+                        <p>
+                          <var>100</var> でちょうど
+                          <var>D</var> 回割りきれる正の整数の中で
+                          <var>N</var> 番目に小さいものを出力しなさい.
+                        </p>
+                      </section>
+                    </div>
+                  </div>
+
+                  <hr />
+
+                  <div class="part">
+                    <section>
+                      <h3>入力例 1</h3>
+                      <pre>
+0 5
+</pre
+                      >
+                    </section>
+                  </div>
+
+                  <div class="part">
+                    <section>
+                      <h3>出力例 1</h3>
+                      <pre>
+5
+</pre
+                      >
+
+                      <p>
+                        <var>100</var> でちょうど
+                        <var>0</var> 回割り切れる（すなわち,
+                        <var>100</var> で割り切れない）整数は, <var>1</var>,
+                        <var>2</var>, <var>3</var>, <var>4</var>, <var>5</var>,
+                        <var>6</var>, <var>7</var>, ... と続く.<br />
+                        よって, <var>5</var> 番目に小さいりんごさんが喜ぶ整数は
+                        <var>5</var> である.
+                      </p>
+                    </section>
+                  </div>
+
+                  <hr />
+
+                  <div class="part">
+                    <section>
+                      <h3>入力例 2</h3>
+                      <pre>
+1 11
+</pre
+                      >
+                    </section>
+                  </div>
+
+                  <div class="part">
+                    <section>
+                      <h3>出力例 2</h3>
+                      <pre>
+1100
+</pre
+                      >
+
+                      <p>
+                        <var>100</var> でちょうど
+                        <var>1</var> 回割り切れる整数は, <var>100</var>,
+                        <var>200</var>, <var>300</var>, <var>400</var>,
+                        <var>500</var>, <var>600</var>, <var>700</var>,
+                        <var>800</var>, <var>900</var>, <var>1 \ 000</var>,
+                        <var>1 \ 100</var>, ... と続く.<br />
+                        よって, 求めたい整数は <var>1 \ 100</var> である.
+                      </p>
+                    </section>
+                  </div>
+
+                  <hr />
+
+                  <div class="part">
+                    <section>
+                      <h3>入力例 3</h3>
+                      <pre>
+2 85
+</pre
+                      >
+                    </section>
+                  </div>
+
+                  <div class="part">
+                    <section>
+                      <h3>出力例 3</h3>
+                      <pre>
+850000
+</pre
+                      >
+
+                      <p>
+                        <var>100</var> でちょうど
+                        <var>2</var> 回割り切れる整数は, <var>10 \ 000</var>,
+                        <var>20 \ 000</var>, <var>30 \ 000</var>, ... と続く.<br />
+                        よって, 求めたい整数は <var>850 \ 000</var> である.
+                      </p>
+                    </section>
+                  </div>
+                </span>
+                <span class="lang-en">
+                  <p>Score: <var>200</var> points</p>
+
+                  <div class="part">
+                    <section>
+                      <h3>Problem Statement</h3>
+                      <p>
+                        Today, the memorable AtCoder Beginner Contest 100 takes
+                        place. On this occasion, Takahashi would like to give an
+                        integer to Ringo.<br />
+                        As the name of the contest is AtCoder Beginner Contest
+                        100, Ringo would be happy if he is given a positive
+                        integer that can be divided by <var>100</var>
+                        <strong>exactly</strong> <var>D</var> times.
+                      </p>
+                      <p>
+                        Find the <var>N</var>-th smallest integer that would
+                        make Ringo happy.
+                      </p>
+                    </section>
+                  </div>
+
+                  <div class="part">
+                    <section>
+                      <h3>Constraints</h3>
+                      <ul>
+                        <li>
+                          <var>D</var> is <var>0</var>, <var>1</var> or
+                          <var>2</var>.
+                        </li>
+                        <li>
+                          <var>N</var> is an integer between <var>1</var> and
+                          <var>100</var> (inclusive).
+                        </li>
+                      </ul>
+                    </section>
+                  </div>
+
+                  <hr />
+
+                  <div class="io-style">
+                    <div class="part">
+                      <section>
+                        <h3>Input</h3>
+                        <p>
+                          Input is given from Standard Input in the following
+                          format:
+                        </p>
+                        <pre><var>D</var> <var>N</var>
+</pre>
+                      </section>
+                    </div>
+
+                    <div class="part">
+                      <section>
+                        <h3>Output</h3>
+                        <p>
+                          Print the <var>N</var>-th smallest integer that can be
+                          divided by <var>100</var> exactly <var>D</var> times.
+                        </p>
+                      </section>
+                    </div>
+                  </div>
+
+                  <hr />
+
+                  <div class="part">
+                    <section>
+                      <h3>Sample Input 1</h3>
+                      <pre>
+0 5
+</pre
+                      >
+                    </section>
+                  </div>
+
+                  <div class="part">
+                    <section>
+                      <h3>Sample Output 1</h3>
+                      <pre>
+5
+</pre
+                      >
+
+                      <p>
+                        The integers that can be divided by
+                        <var>100</var> exactly <var>0</var> times (that is, not
+                        divisible by <var>100</var>) are as follows:
+                        <var>1</var>, <var>2</var>, <var>3</var>, <var>4</var>,
+                        <var>5</var>, <var>6</var>, <var>7</var>, ...<br />
+                        Thus, the <var>5</var>-th smallest integer that would
+                        make Ringo happy is <var>5</var>.
+                      </p>
+                    </section>
+                  </div>
+
+                  <hr />
+
+                  <div class="part">
+                    <section>
+                      <h3>Sample Input 2</h3>
+                      <pre>
+1 11
+</pre
+                      >
+                    </section>
+                  </div>
+
+                  <div class="part">
+                    <section>
+                      <h3>Sample Output 2</h3>
+                      <pre>
+1100
+</pre
+                      >
+
+                      <p>
+                        The integers that can be divided by
+                        <var>100</var> exactly once are as follows:
+                        <var>100</var>, <var>200</var>, <var>300</var>,
+                        <var>400</var>, <var>500</var>, <var>600</var>,
+                        <var>700</var>, <var>800</var>, <var>900</var>,
+                        <var>1 \ 000</var>, <var>1 \ 100</var>, ...<br />
+                        Thus, the integer we are seeking is <var>1 \ 100</var>.
+                      </p>
+                    </section>
+                  </div>
+
+                  <hr />
+
+                  <div class="part">
+                    <section>
+                      <h3>Sample Input 3</h3>
+                      <pre>
+2 85
+</pre
+                      >
+                    </section>
+                  </div>
+
+                  <div class="part">
+                    <section>
+                      <h3>Sample Output 3</h3>
+                      <pre>
+850000
+</pre
+                      >
+
+                      <p>
+                        The integers that can be divided by
+                        <var>100</var> exactly twice are as follows:
+                        <var>10 \ 000</var>, <var>20 \ 000</var>,
+                        <var>30 \ 000</var>, ...<br />
+                        Thus, the integer we are seeking is
+                        <var>850 \ 000</var>.
+                      </p>
+                    </section>
+                  </div>
+                </span>
+              </span>
+            </div>
+          </div>
+        </div>
+
+        <hr />
+
+        <div
+          class="a2a_kit a2a_kit_size_20 a2a_default_style pull-right"
+          data-a2a-url="https://atcoder.jp/contests/abc100/tasks/abc100_b?lang=en"
+          data-a2a-title="B - Ringo&#39;s Favorite Numbers"
+        >
+          <a class="a2a_button_facebook"></a>
+          <a class="a2a_button_twitter"></a>
+
+          <a class="a2a_button_telegram"></a>
+
+          <a class="a2a_dd" href="https://www.addtoany.com/share"></a>
+        </div>
+
+        <script async src="//static.addtoany.com/menu/page.js"></script>
+      </div>
+      <hr />
+    </div>
+
+    <div class="container" style="margin-bottom: 80px">
+      <footer class="footer">
+        <ul>
+          <li><a href="/contests/abc100/rules">Rule</a></li>
+          <li><a href="/contests/abc100/glossary">Glossary</a></li>
+        </ul>
+
+        <ul>
+          <li><a href="/tos">Terms of service</a></li>
+          <li><a href="/privacy">Privacy Policy</a></li>
+          <li><a href="/personal">Information Protection Policy</a></li>
+          <li><a href="/company">Company</a></li>
+          <li><a href="/faq">FAQ</a></li>
+          <li><a href="/contact">Contact</a></li>
+        </ul>
+        <div class="text-center">
+          <small id="copyright"
+            >Copyright Since 2012 &copy;<a href="http://atcoder.co.jp"
+              >AtCoder Inc.</a
+            >
+            All rights reserved.</small
+          >
+        </div>
+      </footer>
+    </div>
+    <p id="fixed-server-timer" class="contest-timer"></p>
+    <div id="scroll-page-top" style="display: none">
+      <span class="glyphicon glyphicon-arrow-up" aria-hidden="true"></span> Page
+      Top
+    </div>
+  </body>
+</html>

tests/fixtures/cses_task_1068.html

@@ -0,0 +1,156 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width,initial-scale=1" />
+    <link rel="stylesheet " type="text/css" href="/cses.css?0" id="styles" />
+    <link
+      rel="stylesheet alternate"
+      type="text/css"
+      href="/cses-dark.css?0"
+      id="styles-dark"
+    />
+    <meta name="theme-color" content="white" id="theme-color" />
+    <script type="application/json" id="darkmode-enabled">
+      false
+    </script>
+    <script src="/ui.js"></script>
+    <link
+      rel="stylesheet"
+      type="text/css"
+      href="/lib/fontawesome/css/all.min.css"
+    />
+  </head>
+  <body class="with-sidebar">
+    <div class="header">
+      <div>
+        <a href="/" class="logo"><img src="/logo.png?1" alt="CSES" /></a>
+        <a
+          class="menu-toggle"
+          onclick="document.body.classList.toggle('menu-open');"
+        >
+          <i class="fas fa-bars"></i>
+        </a>
+        <div class="controls">
+          <a class="account" href="/login">Login</a>
+          <span>&mdash;</span>
+          <a
+            href="/darkmode"
+            title="Toggle dark mode"
+            onclick="return toggle_theme()"
+            ><i aria-label="Dark mode" class="fas fa-adjust"></i
+            ><span>Dark mode</span></a
+          >
+        </div>
+      </div>
+    </div>
+    <div class="skeleton">
+      <div class="navigation">
+        <div class="title-block">
+          <h3><a href="/problemset/list/">CSES Problem Set</a></h3>
+          <h1>Weird Algorithm</h1>
+          <ul class="nav">
+            <li><a href="/problemset/task/1068/" class="current">Task</a></li>
+            <li><a href="/problemset/stats/1068/">Statistics</a></li>
+          </ul>
+        </div>
+      </div>
+
+      <div class="content-wrapper">
+        <div class="content">
+          <title>CSES - Weird Algorithm</title
+          ><link rel="stylesheet" href="/lib/katex/katex.min.css" />
+          <script defer src="/lib/katex/katex.min.js"></script>
+          <script defer src="/lib/katex/contrib/copy-tex.min.js"></script>
+          <script
+            defer
+            src="/lib/google-code-prettify/run_prettify.js"
+          ></script>
+          <script>
+            addEventListener('DOMContentLoaded', function (e) {
+              const mathElements = document.getElementsByClassName('math')
+              const macros = {}
+              for (let element of mathElements) {
+                katex.render(element.textContent, element, {
+                  displayMode: element.classList.contains('math-display'),
+                  throwOnError: false,
+                  globalGroup: true,
+                  macros
+                })
+              }
+            })
+          </script>
+          <ul class="task-constraints">
+            <li><b>Time limit:</b> 1.00 s</li>
+            <li><b>Memory limit:</b> 512 MB</li>
+          </ul>
+          <div class="md">
+            <p>
+              Consider an algorithm that takes as input a positive integer
+              <span class="math math-inline">n</span>. If
+              <span class="math math-inline">n</span> is even, the algorithm
+              divides it by two, and if
+              <span class="math math-inline">n</span> is odd, the algorithm
+              multiplies it by three and adds one. The algorithm repeats this,
+              until <span class="math math-inline">n</span> is one. For example,
+              the sequence for <span class="math math-inline">n=3</span> is as
+              follows:
+              <span class="math math-display">
+                3 \rightarrow 10 \rightarrow 5 \rightarrow 16 \rightarrow 8
+                \rightarrow 4 \rightarrow 2 \rightarrow 1</span
+              >
+              Your task is to simulate the execution of the algorithm for a
+              given value of <span class="math math-inline">n</span>.
+            </p>
+            <h1 id="input">Input</h1>
+            <p>
+              The only input line contains an integer
+              <span class="math math-inline">n</span>.
+            </p>
+            <h1 id="output">Output</h1>
+            <p>
+              Print a line that contains all values of
+              <span class="math math-inline">n</span> during the algorithm.
+            </p>
+            <h1 id="constraints">Constraints</h1>
+            <ul>
+              <li><span class="math math-inline">1 \le n \le 10^6</span></li>
+            </ul>
+            <h1 id="example">Example</h1>
+            <p>Input:</p>
+            <pre>
+3
+</pre
+            >
+            <p>Output:</p>
+            <pre>
+3 10 5 16 8 4 2 1
+</pre
+            >
+          </div>
+        </div>
+        <div class="nav sidebar">
+          <h4>Introductory Problems</h4>
+          <a class="current" href="/problemset/task/1068"
+            >Weird Algorithm<span class="task-score icon"></span></a
+          ><a href="/problemset/task/1083"
+            >Missing Number<span class="task-score icon"></span></a
+          ><a href="/problemset/task/1069"
+            >Repetitions<span class="task-score icon"></span></a
+          ><a href="/problemset/task/1094"
+            >Increasing Array<span class="task-score icon"></span></a
+          ><a href="/problemset/task/1070"
+            >Permutations<span class="task-score icon"></span></a
+          ><a href="/problemset/task/1071"
+            >Number Spiral<span class="task-score icon"></span></a
+          ><a href="/problemset/task/1072"
+            >Two Knights<span class="task-score icon"></span></a
+          ><a href="/problemset/task/1092"
+            >Two Sets<span class="task-score icon"></span></a
+          >...
+          <hr />
+        </div>
+      </div>
+    </div>
+  </body>
+</html>

tests/fixtures/cses_task_1621.html

@@ -0,0 +1,150 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width,initial-scale=1" />
+    <link rel="stylesheet " type="text/css" href="/cses.css?0" id="styles" />
+    <link
+      rel="stylesheet alternate"
+      type="text/css"
+      href="/cses-dark.css?0"
+      id="styles-dark"
+    />
+    <meta name="theme-color" content="white" id="theme-color" />
+    <script type="application/json" id="darkmode-enabled">
+      false
+    </script>
+    <script src="/ui.js"></script>
+    <link
+      rel="stylesheet"
+      type="text/css"
+      href="/lib/fontawesome/css/all.min.css"
+    />
+  </head>
+  <body class="with-sidebar">
+    <div class="header">
+      <div>
+        <a href="/" class="logo"><img src="/logo.png?1" alt="CSES" /></a>
+        <a
+          class="menu-toggle"
+          onclick="document.body.classList.toggle('menu-open');"
+        >
+          <i class="fas fa-bars"></i>
+        </a>
+        <div class="controls">
+          <a class="account" href="/login">Login</a>
+          <span>&mdash;</span>
+          <a
+            href="/darkmode"
+            title="Toggle dark mode"
+            onclick="return toggle_theme()"
+            ><i aria-label="Dark mode" class="fas fa-adjust"></i
+            ><span>Dark mode</span></a
+          >
+        </div>
+      </div>
+    </div>
+    <div class="skeleton">
+      <div class="navigation">
+        <div class="title-block">
+          <h3><a href="/problemset/list/">CSES Problem Set</a></h3>
+          <h1>Distinct Numbers</h1>
+          <ul class="nav">
+            <li><a href="/problemset/task/1621/" class="current">Task</a></li>
+            <li><a href="/problemset/stats/1621/">Statistics</a></li>
+          </ul>
+        </div>
+      </div>
+
+      <div class="content-wrapper">
+        <div class="content">
+          <title>CSES - Distinct Numbers</title
+          ><link rel="stylesheet" href="/lib/katex/katex.min.css" />
+          <script defer src="/lib/katex/katex.min.js"></script>
+          <script defer src="/lib/katex/contrib/copy-tex.min.js"></script>
+          <script
+            defer
+            src="/lib/google-code-prettify/run_prettify.js"
+          ></script>
+          <script>
+            addEventListener('DOMContentLoaded', function (e) {
+              const mathElements = document.getElementsByClassName('math')
+              const macros = {}
+              for (let element of mathElements) {
+                katex.render(element.textContent, element, {
+                  displayMode: element.classList.contains('math-display'),
+                  throwOnError: false,
+                  globalGroup: true,
+                  macros
+                })
+              }
+            })
+          </script>
+          <ul class="task-constraints">
+            <li><b>Time limit:</b> 1.00 s</li>
+            <li><b>Memory limit:</b> 512 MB</li>
+          </ul>
+          <div class="md">
+            <p>
+              You are given a list of
+              <span class="math math-inline">n</span> integers, and your task is
+              to calculate the number of <em>distinct</em> values in the list.
+            </p>
+            <h1 id="input">Input</h1>
+            <p>
+              The first input line has an integer
+              <span class="math math-inline">n</span>: the number of values.
+            </p>
+            <p>
+              The second line has
+              <span class="math math-inline">n</span> integers
+              <span class="math math-inline">x_1,x_2,\dots,x_n</span>.
+            </p>
+            <h1 id="output">Output</h1>
+            <p>Print one integers: the number of distinct values.</p>
+            <h1 id="constraints">Constraints</h1>
+            <ul>
+              <li>
+                <span class="math math-inline">1 \le n \le 2 \cdot 10^5</span>
+              </li>
+              <li><span class="math math-inline">1 \le x_i \le 10^9</span></li>
+            </ul>
+            <h1 id="example">Example</h1>
+            <p>Input:</p>
+            <pre>
+5
+2 3 2 2 3
+</pre
+            >
+            <p>Output:</p>
+            <pre>
+2
+</pre
+            >
+          </div>
+        </div>
+        <div class="nav sidebar">
+          <h4>Sorting and Searching</h4>
+          <a class="current" href="/problemset/task/1621"
+            >Distinct Numbers<span class="task-score icon"></span></a
+          ><a href="/problemset/task/1084"
+            >Apartments<span class="task-score icon"></span></a
+          ><a href="/problemset/task/1090"
+            >Ferris Wheel<span class="task-score icon"></span></a
+          ><a href="/problemset/task/1091"
+            >Concert Tickets<span class="task-score icon"></span></a
+          ><a href="/problemset/task/1619"
+            >Restaurant Customers<span class="task-score icon"></span></a
+          ><a href="/problemset/task/1629"
+            >Movie Festival<span class="task-score icon"></span></a
+          ><a href="/problemset/task/1640"
+            >Sum of Two Values<span class="task-score icon"></span></a
+          ><a href="/problemset/task/1643"
+            >Maximum Subarray Sum<span class="task-score icon"></span></a
+          >...
+          <hr />
+        </div>
+      </div>
+    </div>
+  </body>
+</html>

tests/scrapers/test_filler.py

@@ -1,2 +0,0 @@
-def test():
-    assert 5 == 5

tests/test_scrapers.py

@@ -0,0 +1,69 @@
+import pytest
+
+from scrapers.models import (
+    ContestListResult,
+    MetadataResult,
+    TestsResult,
+)
+
+MODEL_FOR_MODE = {
+    "metadata": MetadataResult,
+    "contests": ContestListResult,
+}
+
+MATRIX = {
+    "cses": {
+        "metadata": ("introductory_problems",),
+        "tests": ("introductory_problems",),
+        "contests": tuple(),
+    },
+    "atcoder": {
+        "metadata": ("abc100",),
+        "tests": ("abc100",),
+        "contests": tuple(),
+    },
+    "codeforces": {
+        "metadata": ("1550",),
+        "tests": ("1550",),
+        "contests": tuple(),
+    },
+}
+
+
+@pytest.mark.parametrize("scraper", MATRIX.keys())
+@pytest.mark.parametrize("mode", ["metadata", "tests", "contests"])
+def test_scraper_offline_fixture_matrix(run_scraper_offline, scraper, mode):
+    args = MATRIX[scraper][mode]
+    rc, objs = run_scraper_offline(scraper, mode, *args)
+    assert rc in (0, 1), f"Bad exit code {rc}"
+    assert objs, f"No JSON output for {scraper}:{mode}"
+
+    if mode in ("metadata", "contests"):
+        Model = MODEL_FOR_MODE[mode]
+        model = Model.model_validate(objs[-1])
+        assert model is not None
+        if mode == "metadata":
+            assert model.success in (True, False)
+            if model.success:
+                assert len(model.problems) >= 1
+                assert all(isinstance(p.id, str) and p.id for p in model.problems)
+        else:
+            assert model.success in (True, False)
+            if model.success:
+                assert len(model.contests) >= 1
+    else:
+        validated_any = False
+        for obj in objs:
+            if "success" in obj and "tests" in obj and "problem_id" in obj:
+                tr = TestsResult.model_validate(obj)
+                assert tr.problem_id != ""
+                assert isinstance(tr.tests, list)
+                validated_any = True
+            else:
+                assert "problem_id" in obj
+                assert "tests" in obj and isinstance(obj["tests"], list)
+                assert (
+                    "timeout_ms" in obj and "memory_mb" in obj and "interactive" in obj
+                )
+                validated_any = True
+        assert validated_any, "No valid tests payloads validated"

uv.lock

@@ -92,6 +92,15 @@ wheels = [
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 ]
 
+[[package]]
+name = "annotated-types"
+version = "0.7.0"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/ee/67/531ea369ba64dcff5ec9c3402f9f51bf748cec26dde048a2f973a4eea7f5/annotated_types-0.7.0.tar.gz", hash = "sha256:aff07c09a53a08bc8cfccb9c85b05f1aa9a2a6f23728d790723543408344ce89", size = 16081, upload-time = "2024-05-20T21:33:25.928Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/78/b6/6307fbef88d9b5ee7421e68d78a9f162e0da4900bc5f5793f6d3d0e34fb8/annotated_types-0.7.0-py3-none-any.whl", hash = "sha256:1f02e8b43a8fbbc3f3e0d4f0f4bfc8131bcb4eebe8849b8e5c773f3a1c582a53", size = 13643, upload-time = "2024-05-20T21:33:24.1Z" },
+]
+
 [[package]]
 name = "anyio"
 version = "4.11.0"
@@ -1299,6 +1308,86 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/a0/e3/59cd50310fc9b59512193629e1984c1f95e5c8ae6e5d8c69532ccc65a7fe/pycparser-2.23-py3-none-any.whl", hash = "sha256:e5c6e8d3fbad53479cab09ac03729e0a9faf2bee3db8208a550daf5af81a5934", size = 118140, upload-time = "2025-09-09T13:23:46.651Z" },
 ]
 
+[[package]]
+name = "pydantic"
+version = "2.11.10"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "annotated-types" },
+    { name = "pydantic-core" },
+    { name = "typing-extensions" },
+    { name = "typing-inspection" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/ae/54/ecab642b3bed45f7d5f59b38443dcb36ef50f85af192e6ece103dbfe9587/pydantic-2.11.10.tar.gz", hash = "sha256:dc280f0982fbda6c38fada4e476dc0a4f3aeaf9c6ad4c28df68a666ec3c61423", size = 788494, upload-time = "2025-10-04T10:40:41.338Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/bd/1f/73c53fcbfb0b5a78f91176df41945ca466e71e9d9d836e5c522abda39ee7/pydantic-2.11.10-py3-none-any.whl", hash = "sha256:802a655709d49bd004c31e865ef37da30b540786a46bfce02333e0e24b5fe29a", size = 444823, upload-time = "2025-10-04T10:40:39.055Z" },
+]
+
+[[package]]
+name = "pydantic-core"
+version = "2.33.2"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "typing-extensions" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/ad/88/5f2260bdfae97aabf98f1778d43f69574390ad787afb646292a638c923d4/pydantic_core-2.33.2.tar.gz", hash = "sha256:7cb8bc3605c29176e1b105350d2e6474142d7c1bd1d9327c4a9bdb46bf827acc", size = 435195, upload-time = "2025-04-23T18:33:52.104Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/3f/8d/71db63483d518cbbf290261a1fc2839d17ff89fce7089e08cad07ccfce67/pydantic_core-2.33.2-cp311-cp311-macosx_10_12_x86_64.whl", hash = "sha256:4c5b0a576fb381edd6d27f0a85915c6daf2f8138dc5c267a57c08a62900758c7", size = 2028584, upload-time = "2025-04-23T18:31:03.106Z" },
+    { url = "https://files.pythonhosted.org/packages/24/2f/3cfa7244ae292dd850989f328722d2aef313f74ffc471184dc509e1e4e5a/pydantic_core-2.33.2-cp311-cp311-macosx_11_0_arm64.whl", hash = "sha256:e799c050df38a639db758c617ec771fd8fb7a5f8eaaa4b27b101f266b216a246", size = 1855071, upload-time = "2025-04-23T18:31:04.621Z" },
+    { url = "https://files.pythonhosted.org/packages/b3/d3/4ae42d33f5e3f50dd467761304be2fa0a9417fbf09735bc2cce003480f2a/pydantic_core-2.33.2-cp311-cp311-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:dc46a01bf8d62f227d5ecee74178ffc448ff4e5197c756331f71efcc66dc980f", size = 1897823, upload-time = "2025-04-23T18:31:06.377Z" },
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+]
+
 [[package]]
 name = "pyee"
 version = "13.0.0"
@@ -1460,6 +1549,7 @@ dependencies = [
     { name = "curl-cffi" },
     { name = "httpx" },
     { name = "ndjson" },
+    { name = "pydantic" },
     { name = "requests" },
     { name = "scrapling", extra = ["fetchers"] },
 ]
@@ -1482,6 +1572,7 @@ requires-dist = [
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     { name = "httpx", specifier = ">=0.28.1" },
     { name = "ndjson", specifier = ">=0.3.1" },
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     { name = "requests", specifier = ">=2.32.5" },
     { name = "scrapling", extras = ["fetchers"], specifier = ">=0.3.5" },
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 ]
 
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+version = "0.4.2"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "typing-extensions" },
+]
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+wheels = [
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+]
+
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 name = "ua-parser"
 version = "1.0.1"