@[silencer468](/user/1104397) ```c
#include<iostream>
#include<cstring>
#include<cstdio>
using namespace std;
int fx[5]={-1,0,0,1},fy[5]={0,-1,1,0},ans[100005];
bool mp[1050][1050];
int visited[1050][1050];
int s,n,m;
void f(int x,int y,int sign,int v)
{
//cout<<x<<' '<<y<<' '<<sign<<endl;
if(x<0||x>=n||y<0||y>=n) return;
if(mp[x][y]==sign||visited[x][y]) return;
s++;
visited[x][y]=v;
for(int i=0;i<4;i++)
{
f(x+fx[i],y+fy[i],mp[x][y],v);
}
return;
}
int main()
{
cin>>n>>m;
for(int i=0;i<n;i++)
{
for(int j=0;j<n;j++)
{
char t;
cin>>t;
// cout<<"aa "<<t<<endl;
mp[i][j]=t-'0';
}
}
for(int i=0;i<m;i++)
{
int x,y;
cin>>x>>y;
if(visited[x-1][y-1])
{
cout<<ans[visited[x-1][y-1]]<<endl;
}else
{
s=0;
f(x-1,y-1,!mp[x-1][y-1],i+1);
ans[i+1]=s;
cout<<s<<endl;
}
}
return 0;
}
```
by xxc123 @ 2024-03-15 20:59:47
@[xxc123](/user/787732) 佬，你的代码思路和我差不多，那我是错在哪里呢？
by silencer468 @ 2024-03-15 23:53:06