fea: more contests

usaco/bronze/sorting/angry.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;
+
+using i32 = int32_t;
+using u32 = uint32_t;
+using i64 = int64_t;
+using u64 = uint64_t;
+using f64 = double;
+using f128 = long double;
+
+#if __cplusplus >= 202002L
+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());
+}
+#endif
+
+static void NO() { std::cout << "NO\n"; }
+
+static void YES() { std::cout << "YES\n"; }
+
+#define all(x) (x).begin(), (x).end()
+#define rall(x) (x).rbegin(), (x).rend()
+#define ff first
+#define ss second
+
+#ifdef LOCAL
+#define db(...) std::print(__VA_ARGS__)
+#define dbln(...) std::println(__VA_ARGS__)
+#else
+#define db(...)
+#define dbln(...)
+#endif
+//  }}}
+
+void solve() {
+  i32 n;
+  cin >> n;
+  vector<i32> a(n);
+  for (auto &e : a)
+    cin >> e;
+  sort(all(a));
+
+  i32 ans = 1;
+  for (u32 i = 0; i < n; ++i) {
+    i32 l = i;
+    i32 radius = 1;
+
+    while (l >= 0) {
+      i32 j = l;
+      while (j >= 0 && a[j] >= a[l] - radius) {
+        --j;
+      }
+      ++j;
+      if (j == l) {
+        break;
+      }
+      l = j;
+      ++radius;
+    }
+
+    i32 r = i;
+    radius = 1;
+    while (r < n) {
+      i32 j = r;
+      while (j < n && a[j] <= a[r] + radius) {
+        ++j;
+      }
+      --j;
+      if (j == r) {
+        break;
+      }
+      ++radius;
+      r = j;
+    }
+
+    ans = max(ans, r - l + 1);
+  }
+  cout << ans << '\n';
+}
+
+int main() { // {{{
+  cin.tie(nullptr)->sync_with_stdio(false);
+  cin.exceptions(cin.failbit);
+
+#define PROBLEM_NAME "angry"
+
+#ifdef LOCAL
+  freopen("io/" PROBLEM_NAME ".in", "r", stdin);
+  freopen("io/" PROBLEM_NAME ".out", "w", stdout);
+#else
+  freopen(PROBLEM_NAME ".in", "r", stdin);
+  freopen(PROBLEM_NAME ".out", "w", stdout);
+#endif
+
+  solve();
+
+  return 0;
+}
+// }}}