见后文注释
------------
```cpp
#include<bits/stdc++.h>
using namespace std;
struct node{
int x,y;
}z;
node dlt;
int yx[4]={1,-1,2,-2};
int yy[4]={1,-1,2,-2};
bool vis[405][405];
int a[405][405];
int n,m,xg,yg;
queue <node> q;//十二行
void bfs(int x,int y,int step){
a[x][y]=step;
vis[x][y]=false;
//queue<node> q;//与第十二行重复
z.x=x;
z.y=y;
q.push(z);
while(!q.empty()){
dlt=q.front();
q.pop();
for(int i=0;i<4;i++){
for(int j=0;j<4;j++){
if(abs(yx[i])!=abs(yy[j])){
int newx=dlt.x+yx[i];
int newy=dlt.y+yy[j];
if(newx<1 || newx>n || newy<1 || newy>m) continue;
if(vis[newx][newy]){
z.x=newx;
z.y=newy;//z,y???改为z.y
q.push(z);
vis[newx][newy]=false;
a[newx][newy]=a[dlt.x][dlt.y]+1;
}
}
}
}
}
}
int main(){
memset(vis,true,sizeof(vis));
memset(a,-1,sizeof(a));
cin>>n>>m>>xg>>yg;
bfs(xg,yg,0);
for(int i=1;i<=n;i++){
for(int j=1;j<=m;j++){
printf("%-5d",a[i][j]);
}
cout<<endl;
}
return 0;
}
```
by Lmh20101128 @ 2023-11-11 00:06:52
最后厚颜无耻的求关注。（下次一定也不是不行）
by Lmh20101128 @ 2023-11-11 00:09:16
为什么把
```
printf("%-5d",a[i][j]);
```
改为
```
printf("%d ",a[i][j]);
```
也能AC ? ? ?
by xwx123456 @ 2023-11-17 22:17:10
@[xwx123456](/user/917301) 因为题目没要求场宽，不设置场宽也对
by Puntus @ 2023-11-19 17:47:54