```
for(int i = 1, s, t; i <= k; i++)
```
中的 `k` 应为 `n-1` ，否则会输入 $k$ 条边
by Y2hlbnlpa2Fp @ 2022-07-22 08:38:55
@[Y2hlbnlpa2Fp](/user/198266) Thank you
by LiuTianyou @ 2022-07-22 08:42:13
@[Y2hlbnlpa2Fp](/user/198266) 已AC，此贴终结
by LiuTianyou @ 2022-07-22 08:43:35
赞美の心
by LiuTianyou @ 2022-07-22 08:43:50