Initial commit

test99-3-5.cpp

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+// lanqiao178 全球变暖
+#include<bits/stdc++.h>
+using namespace std;
+const int N = 1e3 + 10;
+char mp[N][N];
+int n, scc, col[N][N];
+bool vis[N*N];
+// 移动向量
+int dx[] = {0, 0, 1, -1};
+int dy[] = {1, -1, 0, 0};
+
+void dfs(int x, int y){
+    col[x][y] = scc;
+    for(int i = 0; i < 4; i++){ 
+        int nx = x + dx[i], ny = y + dy[i];
+        if( col[nx][ny] || mp[nx][ny] == '.') continue; // 不需要判断nx, ny是否在地图里面，因为地图边缘都是海洋
+        dfs(nx ,ny);
+    }
+}
+
+int main(){
+    ios::sync_with_stdio, cin.tie(0), cout.tie(0);
+    cin >> n;
+    for(int i = 1; i <= n; i++) cin >> mp[i] + 1;
+    for(int i = 1; i <= n; i++){
+        for(int j = 1; j <= n; j++){
+            if(col[i][j] || mp[i][j] == '.') continue;
+            scc++;  // scc表示当前颜色编号
+            dfs(i, j);
+        }
+    }
+    int ans = 0;
+    for(int i = 1; i <= n; i++){
+        for(int j = 1; j <= n; j++){
+            if(mp[i][j] == '.') continue;
+            bool tag = true;
+            for(int k = 0; k < 4; k++){
+                int x = i + dx[k], y = j + dy[k];
+                if(mp[x][y] == '.') tag = false;
+            }
+            if(tag){
+                if(!vis[col[i][j]]) ans++;
+                vis[col[i][j]] = true;
+            }
+        }
+    }
+    cout << scc - ans << '\n';
+    return 0;
+}
+/* test samples
+7
+.......
+.##....
+.##....
+....##.
+..####.
+...###.
+.......
+*/