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kattis/25-2-2025/quite-a-problem.cc

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+#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());
+}
+
+using ll = long long;
+using ld = long double;
+template <typename t>
+using vec = std::vector<t>;
+template <typename t, size_t n>
+using arr = std::array<t, n>;
+
+#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() {
+  string s;
+  string problem = "problem";
+  while (getline(cin, s)) {
+    transform(all(s), s.begin(), [](char c) {
+      return std::tolower(c);
+    });
+
+    cout << (s.find(problem) != string::npos ? "yes" : "no") << endl;
+  }
+}
+
+int main() {  // {{{
+  cin.tie(nullptr)->sync_with_stdio(false);
+
+  int t = 1;
+  // cin >> t;
+
+  while (t--) {
+    solve();
+  }
+
+  return 0;
+}
+// }}}