feat: usaco

usaco/bronze/complete-search/balancing.cc

@@ -0,0 +1,100 @@
+#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() {
+  u32 n, B;
+  cin >> n >> B;
+
+  vector<pair<u32, u32>> pts(n);
+  vector<u32> horiz_placements, vert_placements;
+
+  for (u32 i = 0; i < n; ++i) {
+    cin >> pts[i].ff >> pts[i].ss;
+    vert_placements.emplace_back(pts[i].ff + 1);
+    horiz_placements.emplace_back(pts[i].ss + 1);
+  }
+
+  u64 ans = numeric_limits<u64>::max();
+  for (auto vp : vert_placements) {
+    for (auto hp : horiz_placements) {
+      u64 tl = 0, tr = 0, bl = 0, br = 0;
+      for (auto &[x, y] : pts) {
+        if (x < vp && y > hp)
+          ++tl;
+        if (x > vp && y > hp)
+          ++tr;
+        if (x < vp && y < hp)
+          ++bl;
+        if (x > vp && y < hp)
+          ++br;
+      }
+      ans = min(ans, max({tl, tr, bl, br}));
+    }
+  }
+  cout << ans << '\n';
+}
+
+int main() { // {{{
+  cin.tie(nullptr)->sync_with_stdio(false);
+  cin.exceptions(cin.failbit);
+
+#define PROBLEM_NAME "balancing"
+
+#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;
+}
+// }}}