@[kikis](/user/1340633) 你的没看懂
深搜：
```
/*
1、P1162 填涂颜色
*/
#include<bits/stdc++.h>
using namespace std;
int a[40][40],n,b[40][40];
int xp[5]={0,1,0,-1,0};
int yp[5]={0,0,1,0,-1};
void dfs(int x,int y){
if(x<0 || x>n+1 || y<0 || y>n+1 || b[x][y]!=0)return ;
b[x][y]=1;
for(int i=1;i<=4;i++)dfs(x+xp[i],y+yp[i]);
}
int main(){
cin>>n;
for(int i=1;i<=n;i++){
for(int j=1;j<=n;j++){
cin>>a[i][j];
if(a[i][j]==0)b[i][j]=0;
else b[i][j]=2;
}
}
dfs(0,0);
for(int i=1;i<=n;i++){
for(int j=1;j<=n;j++){
if(b[i][j]==0)cout<<2<<" ";
else cout<<a[i][j]<<" ";
}
cout<<endl;
}
return 0;
}
```
by haimingbei @ 2024-08-20 22:52:13
@[haimingbei](/user/1235026) 我的是简单染色。在1外圈染成3，最后分别输出。
by kikis @ 2024-08-21 09:32:06
@[kikis](/user/1340633) 只考虑四个角是不行的，外层一圈都要考虑
```c
#include <bits/stdc++.h>
using namespace std;
const int N=35;
int n,mp[N][N];
int dir[4][2]={{1,0},{0,1},{-1,0},{0,-1}};
bool check(int x,int y){
return x>0 && x<=n && y>0 && y<=n && mp[x][y]==0;
}
void dfs(int x,int y){
if (mp[x][y]==1) return;
for (int i=0;i<=4;i++){
int dx=x+dir[i][0];
int dy=y+dir[i][1];
if (check(dx,dy)){
mp[dx][dy]=-1;
dfs(dx,dy);
}
}
}
int main (){
cin >> n;
for (int i=1;i<=n;i++)
for (int j=1;j<=n;j++)
cin >> mp[i][j];
for (int i=1;i<=n;i++){
if (mp[i][n]==0) dfs(i,n);
if (mp[i][1]==0) dfs(i,1);
if (mp[1][i]==0) dfs(1,i);
if (mp[n][i]==0) dfs(n,i);
}
for (int i=1;i<=n;i++){
for (int j=1;j<=n;j++){
if (mp[i][j]==-1)
cout << 0 << " ";
else if (mp[i][j]==1)
cout << 1 << " ";
else cout << 2 << " ";
}
cout << endl;
}
return 0;
}
```
看30到35行
by dyh_120 @ 2024-08-21 22:36:48
@[dyh_120](/user/1033610) 谢谢谢谢
by kikis @ 2024-08-24 15:46:43
@[kikis](/user/1340633) 不谢，求关QWQ
by dyh_120 @ 2024-08-24 16:12:36