feat(cses): range queries

;

cses/range-queries/forest-queries.cc

@@ -0,0 +1,93 @@
+#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());
+}
+
+#define prln(...) std::println(__VA_ARGS__)
+#define pr(...) std::print(__VA_ARGS__)
+
+#ifdef LOCAL
+#define dbgln(...) std::println(__VA_ARGS__)
+#define dbg(...) std::print(__VA_ARGS__)
+#endif
+
+using ll = long long;
+using ld = long double;
+template <typename T>
+using v = std::vector<T>;
+template <typename T, size_t N>
+using r = std::array<T, N>;
+template <typename T1, typename T2>
+using p = std::pair<T1, T2>;
+
+#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, q;
+  cin >> n >> q;
+  v<string> grid(n);
+  for (int i = 0; i < n; ++i) {
+    cin >> grid[i];
+  }
+
+  v<v<int>> prefix(n + 1, v<int>(n + 1, 0));
+
+  for (int i = 0; i < n; ++i) {
+    prefix[1][i + 1] = prefix[1][i] + (grid[0][i] == '*');
+  }
+
+  for (int i = 1; i < n; ++i) {
+    prefix[i + 1][1] = prefix[i][1] + (grid[i][0] == '*');
+    for (int j = 1; j < n; ++j) {
+      prefix[i + 1][j + 1] = prefix[i + 1][j] + prefix[i][j + 1] -
+                             prefix[i][j] + (grid[i][j] == '*');
+    }
+  }
+
+  while (q--) {
+    int y1, x1, y2, x2;
+    cin >> y1 >> x1 >> y2 >> x2;
+    cout << prefix[y2][x2] - prefix[y2][x1 - 1] - prefix[y1 - 1][x2] +
+                prefix[y1 - 1][x1 - 1]
+         << endl;
+  }
+}
+
+int main() {  // {{{
+  cin.tie(nullptr)->sync_with_stdio(false);
+
+  int t = 1;
+  // cin >> t;
+  while (t--) {
+    solve();
+  }
+
+  return 0;
+}
+// }}}