@[liu_zimo](/user/581004)
你的扩展判断为什么判断的是脚下的点
```cpp
if(x+dx[i]>=0&&x+dx[i]<=n+1&&y+dy[i]>=0&&y+dy[i]<=n+1&&a[x+dx[i]][y+dy[i]]==0)
```
改成这样就行了
by CE_自动机 @ 2021-11-03 19:51:09
@[CE_自动机](/user/262885) 谢谢dalao
by daydayWA @ 2021-11-03 19:55:43