Add 06080.cpp

06xxx/06080.cpp

@@ -0,0 +1,37 @@
+#include <iostream>
+#include <vector>
+using namespace std;
+
+int dy[8] = {1, 1, 1, 0, 0, -1, -1, -1};
+int dx[8] = {1, 0, -1, 1, -1, 1, 0, -1};
+
+void dfs(int r, int c, vector<vector<int>> &v, int y, int x) {
+  v[y][x] = 0;
+  for (int i=0; i<8; i++) {
+    int ny = y + dy[i], nx = x + dx[i];
+    if (ny < 0 || ny >= r || nx < 0 || nx >= c) continue;
+    if (v[ny][nx]) dfs(r, c, v, ny, nx);
+  }
+}
+
+void solve(void) {
+  int r, c; cin >> r >> c;
+  vector<vector<int>> v(r, vector<int>(c));
+  for (int i=0; i<r; i++) for (int j=0; j<c; j++) cin >> v[i][j];
+
+  int ans = 0;
+  for (int i=0; i<r; i++) for (int j=0; j<c; j++) {
+    if (!v[i][j]) continue;
+    dfs(r, c, v, i, j);
+    ans++;
+  }
+  cout << ans;
+}
+
+int main(void) {
+  ios::sync_with_stdio(false);
+  cin.tie(nullptr);
+
+  solve();
+  return 0;
+}