1 files changed, 69 insertions, 0 deletions
diff --git a/works/solutions/acwing/1233.cpp b/works/solutions/acwing/1233.cpp
new file mode 100644
index 0000000..117b2fb
--- /dev/null
+++ b/works/solutions/acwing/1233.cpp
@@ -0,0 +1,69 @@
+#include <iostream>
+#include <utility>
+
+const int M = 1010;
+
+int N;
+char map[M][M];
+bool visited[M][M];
+
+int not_sink_count;
+
+const std::pair<int, int> moves[]{{1, 0}, {0, 1}, {-1, 0}, {0, -1}};
+
+void dfs(int r, int c) {
+  if (visited[r][c])
+    return;
+  if (map[r][c] != '#')
+    return;
+
+  visited[r][c] = true;
+
+  bool sink = false;
+
+  for (const auto &move : moves) {
+    if (map[r + move.first][c + move.second] == '.') {
+      sink = true;
+      break;
+    }
+  }
+
+  if (!sink) {
+    not_sink_count++;
+  }
+
+  for (const auto &move : moves) {
+    dfs(r + move.first, c + move.second);
+  }
+}
+
+int main() {
+  std::ios_base::sync_with_stdio(false);
+  std::cin.tie(nullptr);
+
+  std::cin >> N;
+
+  for (int i = 1; i <= N; i++) {
+    for (int j = 1; j <= N; j++) {
+      std::cin >> map[i][j];
+    }
+  }
+
+  int result = 0;
+
+  for (int i = 1; i <= N; i++) {
+    for (int j = 1; j <= N; j++) {
+      if (map[i][j] == '#' && !visited[i][j]) {
+        dfs(i, j);
+        if (not_sink_count == 0) {
+          result++;
+        }
+        not_sink_count = 0;
+      }
+    }
+  }
+
+  std::cout << result;
+
+  return 0;
+}