feat(codeforces/937): a-f

codeforces/937/b.cc

@@ -0,0 +1,54 @@
+#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;
+//  }}}
+
+void solve() {
+  u32 n;
+  cin >> n;
+
+  vector<vector<char>> board(2 * n, vector<char>(2 * n, '.'));
+  for (u32 i = 0; i < n; ++i) {
+    for (u32 j = 0; j < n; ++j) {
+      if ((i & 1) == (j & 1)) {
+        board[2 * i][2 * j] = '#';
+        board[2 * i + 1][2 * j] = '#';
+        board[2 * i + 1][2 * j + 1] = '#';
+        board[2 * i][2 * j + 1] = '#';
+      }
+    }
+  }
+  for (auto& r : board) {
+    for (auto& c : r) {
+      cout << c;
+    }
+    cout << '\n';
+  }
+}
+
+int main() {  // {{{
+  cin.tie(nullptr)->sync_with_stdio(false);
+  cin.exceptions(cin.failbit);
+
+  int tc = 1;
+  cin >> tc;
+
+  for (int t = 0; t < tc; ++t) {
+    solve();
+  }
+
+  return 0;
+}
+// }}}