'commit'

TangDou/Bfs/1381_bfs.cpp

@@ -0,0 +1,48 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+#define x first
+#define y second
+typedef pair<int, int> PII;
+const int N = 110;
+int g[N][N];
+int n, m;
+
+int dx[] = {-1, 0, 1, 0}; //上右下左
+int dy[] = {0, 1, 0, -1}; //上右下左
+
+int ans;
+queue<PII> q;
+
+void bfs() {
+    while (q.size()) {
+        auto u = q.front();
+        q.pop();
+        for (int i = 0; i < 4; i++) {
+            int tx = u.x + dx[i], ty = u.y + dy[i];
+            if (g[tx][ty]) {
+                g[tx][ty] = 0;
+                q.push({tx, ty});
+            }
+        }
+    }
+}
+int main() {
+    cin >> n >> m;
+    for (int i = 1; i <= n; i++)
+        for (int j = 1; j <= m; j++)
+            cin >> g[i][j];
+
+    for (int i = 1; i <= n; i++) {
+        for (int j = 1; j <= m; j++) {
+            if (g[i][j]) {
+                ans++;
+                g[i][j] = 0;
+                q.push({i, j});
+                bfs();
+            }
+        }
+    }
+    printf("%d", ans);
+    return 0;
+}