#include<stdio.h>
#include<iostream>
#include<queue>
using namespace std;
const int N = 1010;
char mp[N][N];
int vis[N][N];
int d[4][2] = {{0,1}, {0,-1}, {1,0}, {-1,0}}; //四个方向
int flag;
void bfs(int x, int y) {
queue<pair<int, int>> q;
q.push({x, y});
vis[x][y] = 1; //标记这个'#'被搜过
while (q.size()) {
pair<int, int> t = q.front();
q.pop();
int tx = t.first, ty = t.second;
if( mp[tx][ty+1]=='#' && mp[tx][ty-1]=='#' &&
mp[tx+1][ty]=='#' && mp[tx-1][ty]=='#' )
flag = 1; //上下左右都是陆地，不会淹没
for (int i = 0; i < 4; i++) { //扩展(tx,ty)的4个邻居
int nx = tx + d[i][0], ny = ty + d[i][1];
if(vis[nx][ny]==0 && mp[nx][ny]=='#'){ //把陆地放进队列
vis[nx][ny] = 1; //注意：这一句必不可少
q.push({nx, ny});
}
}
}
}
int main() {
int n; cin >> n;
for (int i = 0; i < n; i++) cin >> mp[i];
int ans = 0;
for (int i = 0; i < n; i++)
for (int j = 0; j < n; j++)
if (mp[i][j] == '#' && vis[i][j]==0) {
flag = 0;
bfs(i, j);
if(flag == 0) ans++; //这个岛全部被淹，统计岛的数量
}
cout << ans << endl;
return 0;
}
全球变暖的BFS解法用vc6.0报错
提示错误如上图片，应该怎么修改能在vc6.0运行呢
