题目没说没环就有可能有环
@[JiuZhE66666](/user/1049051)
by yhdxg @ 2024-02-24 13:36:09
@[JiuZhE66666](/user/1049051) 考虑到一条边只会往东连，所以不会有环
by MspAInt @ 2024-02-24 14:14:07
@[MspAInt](/user/736801) 感谢！
by JiuZhE66666 @ 2024-02-25 23:03:49
@[yhdxg](/user/1050431) 好的，感谢！
by JiuZhE66666 @ 2024-02-25 23:04:07