老哥双向边
by D_C_Z @ 2024-03-28 18:13:34
加个 ```add(j,i)``` 并且 $M$ 开 $2 \times 10^5$
by D_C_Z @ 2024-03-28 18:15:13
@[yushen6474](/user/647347)
by D_C_Z @ 2024-03-28 18:15:43
哦对不起看错了
by D_C_Z @ 2024-03-28 18:17:27
不需要加 ```add(j,i)``` 。看急了对不起（
by D_C_Z @ 2024-03-28 18:18:11
@[yushen6474](/user/647347)
by D_C_Z @ 2024-03-28 18:19:07
@[D_C_Z](/user/652972) 懂了,感谢
by yushen6474 @ 2024-03-29 08:50:51