bblss123的博客

Description 自从zkysb出了可持久化并查集后…… hzwer:乱写能AC，暴力踩标程 KuribohG：我不路径压缩就过了！ ndsf：暴力就可以轻松虐！ zky:…… n个集合 m个操作 操作： 1 a b 合并a,b所在集合 2 k 回到第k次操作之后的状态(查询算作操作) 3 a b 询问a,b是否属于同一集合，是则输出1否则输出0 请注意本题采用强制在线,

Description A long time ago in a galaxy far, far away, there were N planets. There were also N − 1 interplanetary paths that connected all the planets (directly or indirectly). In other words, the net