feat: interactive problem finer-tuning

lua/cp/cache.lua

@@ -20,6 +20,7 @@
 ---@field test_cases_cached_at? number
 ---@field timeout_ms? number
 ---@field memory_mb? number
+---@field interactive? boolean
 
 ---@class Problem
 ---@field id string
@@ -164,7 +165,16 @@ end
 ---@param test_cases CachedTestCase[]
 ---@param timeout_ms? number
 ---@param memory_mb? number
-function M.set_test_cases(platform, contest_id, problem_id, test_cases, timeout_ms, memory_mb)
+---@param interactive? boolean
+function M.set_test_cases(
+  platform,
+  contest_id,
+  problem_id,
+  test_cases,
+  timeout_ms,
+  memory_mb,
+  interactive
+)
   vim.validate({
     platform = { platform, 'string' },
     contest_id = { contest_id, 'string' },
@@ -172,6 +182,7 @@ function M.set_test_cases(platform, contest_id, problem_id, test_cases, timeout_
     test_cases = { test_cases, 'table' },
     timeout_ms = { timeout_ms, { 'number', 'nil' }, true },
     memory_mb = { memory_mb, { 'number', 'nil' }, true },
+    interactive = { interactive, { 'boolean', 'nil' }, true },
   })
 
   local problem_key = problem_id and (contest_id .. '_' .. problem_id) or contest_id

lua/cp/ui/panel.lua

@@ -32,6 +32,44 @@ function M.toggle_interactive()
     return
   end
 
+  local platform, contest_id = state.get_platform(), state.get_contest_id()
+
+  if not platform then
+    logger.log(
+      'No platform %s configured. Use :CP <platform> <contest> [...] first.',
+      vim.log.levels.ERROR
+    )
+    return
+  end
+
+  if not contest_id then
+    logger.log(
+      ('No contest %s configured for platform %s. Use :CP <platform> <contest> <problem> to set up first.'):format(
+        contest_id,
+        platform
+      ),
+      vim.log.levels.ERROR
+    )
+    return
+  end
+
+  local problem_id = state.get_problem_id()
+  if not problem_id then
+    logger.log(('No problem found for the current problem id %s'):format(problem_id))
+    return
+  end
+
+  local cache = require('cp.cache')
+  cache.load()
+  local contest_data = cache.get_contest_data(platform, contest_id)
+  if contest_data and not contest_data.interactive then
+    logger.log(
+      'This is NOT an interactive problem. Use :CP run instead - aborting.',
+      vim.log.levels.WARN
+    )
+    return
+  end
+
   state.saved_interactive_session = vim.fn.tempname()
   vim.cmd(('mksession! %s'):format(state.saved_interactive_session))
   vim.cmd('silent only')
@@ -89,9 +127,22 @@ function M.toggle_run_panel(is_debug)
     return
   end
 
-  if not state.get_platform() then
+  local platform, contest_id = state.get_platform(), state.get_contest_id()
+
+  if not platform then
     logger.log(
-      'No contest configured. Use :CP <platform> <contest> <problem> to set up first.',
+      'No platform %s configured. Use :CP <platform> <contest> [...] first.',
+      vim.log.levels.ERROR
+    )
+    return
+  end
+
+  if not contest_id then
+    logger.log(
+      ('No contest %s configured for platform %s. Use :CP <platform> <contest> <problem> to set up first.'):format(
+        contest_id,
+        platform
+      ),
       vim.log.levels.ERROR
     )
     return
@@ -99,11 +150,20 @@ function M.toggle_run_panel(is_debug)
 
   local problem_id = state.get_problem_id()
   if not problem_id then
+    logger.log(('No problem found for the current problem id %s'):format(problem_id))
     return
   end
 
-  local platform = state.get_platform()
+  local cache = require('cp.cache')
-  local contest_id = state.get_contest_id()
+  cache.load()
+  local contest_data = cache.get_contest_data(platform, contest_id)
+  if contest_data and contest_data.interactive then
+    logger.log(
+      'This is an interactive problem. Use :CP interact instead - aborting.',
+      vim.log.levels.WARN
+    )
+    return
+  end
 
   logger.log(
     ('run panel: platform=%s, contest=%s, problem=%s'):format(

scrapers/codeforces.py

@@ -199,10 +199,10 @@ def scrape_contest_problems(contest_id: str) -> list[ProblemSummary]:
                 problem_letter: str = href.split("/")[-1].lower()
                 problem_name: str = link.get_text(strip=True)
 
-                if problem_letter and problem_name:
+                if not (problem_letter and problem_name):
-                    problems.append(
+                    continue
-                        ProblemSummary(id=problem_letter, name=problem_name)
+
-                    )
+                problems.append(ProblemSummary(id=problem_letter, name=problem_name))
 
         seen: set[str] = set()
         unique_problems: list[ProblemSummary] = []
@@ -283,6 +283,12 @@ class CodeforcesScraper(BaseScraper):
         soup = BeautifulSoup(response.text, "html.parser")
         timeout_ms, memory_mb = extract_problem_limits(soup)
 
+        problem_statement_div = soup.find("div", class_="problem-statement")
+        interactive = bool(
+            problem_statement_div
+            and "This is an interactive problem" in problem_statement_div.get_text()
+        )
+
         if not tests:
             return self._create_tests_error(
                 f"No tests found for {contest_id} {problem_letter}", problem_id, url
@@ -296,6 +302,7 @@ class CodeforcesScraper(BaseScraper):
             tests=tests,
             timeout_ms=timeout_ms,
             memory_mb=memory_mb,
+            interactive=interactive,
         )
 
     def _scrape_contest_list_impl(self) -> ContestListResult:

scrapers/models.py

@@ -45,3 +45,4 @@ class TestsResult(ScrapingResult):
     tests: list[TestCase]
     timeout_ms: int
     memory_mb: float
+    interactive: bool = False

uv.lock

@@ -282,11 +282,11 @@ wheels = [
 
 [[package]]
 name = "pyparsing"
-version = "3.2.3"
+version = "3.2.5"
 source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/bb/22/f1129e69d94ffff626bdb5c835506b3a5b4f3d070f17ea295e12c2c6f60f/pyparsing-3.2.3.tar.gz", hash = "sha256:b9c13f1ab8b3b542f72e28f634bad4de758ab3ce4546e4301970ad6fa77c38be", size = 1088608, upload-time = "2025-03-25T05:01:28.114Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/f2/a5/181488fc2b9d093e3972d2a472855aae8a03f000592dbfce716a512b3359/pyparsing-3.2.5.tar.gz", hash = "sha256:2df8d5b7b2802ef88e8d016a2eb9c7aeaa923529cd251ed0fe4608275d4105b6", size = 1099274, upload-time = "2025-09-21T04:11:06.277Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/05/e7/df2285f3d08fee213f2d041540fa4fc9ca6c2d44cf36d3a035bf2a8d2bcc/pyparsing-3.2.3-py3-none-any.whl", hash = "sha256:a749938e02d6fd0b59b356ca504a24982314bb090c383e3cf201c95ef7e2bfcf", size = 111120, upload-time = "2025-03-25T05:01:24.908Z" },
+    { url = "https://files.pythonhosted.org/packages/10/5e/1aa9a93198c6b64513c9d7752de7422c06402de6600a8767da1524f9570b/pyparsing-3.2.5-py3-none-any.whl", hash = "sha256:e38a4f02064cf41fe6593d328d0512495ad1f3d8a91c4f73fc401b3079a59a5e", size = 113890, upload-time = "2025-09-21T04:11:04.117Z" },
 ]
 
 [[package]]