递归深度超限。
```
1 2 2
1 2
2 1
```
by ppip @ 2022-09-16 23:11:37
@[Along_Dog](/user/403145)
by ppip @ 2022-09-16 23:11:45
递归栈空间爆了。
by yukari1735 @ 2022-09-16 23:31:25
谢谢，请问递归怎么写，感觉bfs好像也过不了
by Along_Dog @ 2022-09-17 08:15:47