feat(cf): update with 957.f

codeforces/957/e.cc

@@ -0,0 +1,116 @@
+//  {{{
+#include <bits/stdc++.h>
+
+// https://codeforces.com/blog/entry/96344
+
+#pragma GCC optimize("O2,unroll-loops")
+#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
+
+using namespace std;
+
+template <typename T>
+constexpr T MIN = std::numeric_limits<T>::min();
+
+template <typename T>
+constexpr T MAX = std::numeric_limits<T>::max();
+
+template <typename T>
+[[nodiscard]] static T sc(auto&& x) {
+  return static_cast<T>(x);
+}
+
+template <typename T>
+[[nodiscard]] static T sz(auto&& x) {
+  return static_cast<T>(x.size());
+}
+
+template <typename... Args>
+void pr(std::format_string<Args...> fmt, Args&&... args) {
+  std::print(fmt, std::forward<Args>(args)...);
+}
+
+template <typename... Args>
+void pr(std::format_string<Args...> fmt) {
+  std::print(fmt);
+}
+
+template <typename... Args>
+void prln(std::format_string<Args...> fmt, Args&&... args) {
+  std::println(fmt, std::forward<Args>(args)...);
+}
+
+template <typename... Args>
+void prln(std::format_string<Args...> fmt) {
+  std::println(fmt);
+}
+
+void prln() {
+  std::println();
+}
+
+void prln(auto const& t) {
+  std::println("{}", t);
+}
+
+using ll = long long;
+using ld = long double;
+template <typename T>
+using vec = std::vector<T>;
+
+#define ff first
+#define ss second
+#define eb emplace_back
+#define pb push_back
+#define all(x) (x).begin(), (x).end()
+#define rall(x) (x).rbegin(), (x).rend()
+//  }}}
+
+void solve() {
+  int n;
+  cin >> n;
+
+  string strn = to_string(n);
+  int lenn = sz<int>(strn);
+
+  vec<pair<int, int>> ans;
+
+  for (int a = 1; a <= 100000; ++a) {
+    // s =|n|a-b; na-b
+
+    // 1<=|n|a-b<=5
+    // b<=|n|a-1    |n|a-5<=b
+    int lo = max(1, lenn * a - 5);
+    int hi = min(10000, lenn * a - 1);
+
+    for (int b = lo; b <= hi; ++b) {
+      int cmp = 0;
+      for (int i = 0; i < lenn * a - b; ++i) {
+        cmp *= 10;
+        cmp += strn[i % lenn] - '0';
+      }
+      if (cmp == n * a - b) {
+        ans.eb(a, b);
+      }
+    }
+  }
+
+  prln("{}", sz<int>(ans));
+  for (auto& [a, b] : ans) {
+    prln("{} {}", a, b);
+  }
+}
+
+// {{{
+int main() {
+  cin.tie(nullptr)->sync_with_stdio(false);
+
+  int t = 1;
+  cin >> t;
+
+  while (t--) {
+    solve();
+  }
+
+  return 0;
+}
+// }}}