求调,调了壶关

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
ll n,m,ans=0,xx,yy; 
bool a[505][505];
bool vis[505][505];
ll dx[]={0,1,-1,0};
ll dy[]={1,0,0,-1};
bool check(ll x,ll y){
	return x>=0&& x<=n&&y>=0&&y<=n&&!a[x][y]&& !vis[x][y];
}
void dfs(ll x,ll y){
	vis[x][y]=1;
	for (int i=0;i<4;i++){
		if (check(x+dx[i],y+dy[i])) dfs(x+dx[i],y+dy[i]);
	}
}

int main(){

	ios::sync_with_stdio(false);
	ios_base::sync_with_stdio(false);
	cin.tie(0),cout.tie(0);
	
	cin>>n;
	for (int i=1;i<=n;i++){
		for (int j=1;j<=n;j++){
			char c;
			cin>>c;
			if (c=='0') a[i][j]=0;
			else a[i][j]=1;
			
		}
	}
	dfs(0,0);
	for (int i=1;i<=n;i++){
		for (int j=1;j<=n;j++){
			if (a[i][j]){
				cout<<1<<" ";
			}else{
				if (vis[i][j]){
					cout<<0<<" ";
				}else{
					cout<<2<<" ";
				}
			}
			
		}
		cout<<"\n";
	}
	return 0;
}