为何错了

P3367 【模板】并查集

pre[sch(kk)]=sch(dr)@[PTC06](/space/show?uid=12613) 怎么新手都爱犯这种错误
by Ghost_lzy @ 2016-10-21 08:12:29


@[Ghost\_lzy](/space/show?uid=14410) 感谢
by PTC06 @ 2016-10-21 11:14:16


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