求割点 一种显然的n^2做法: 枚举每个点,去掉该点连出的边,然后判断整个图是否联通 用tarjan求割点: 分情况讨论 如果是root的话,其为割点当且仅当下方有两棵及以上的子树 其他情况 设当前节点为u,一个儿子节点为v 存在low[v]>=dfn[u],也就是说其儿子节点v能连到的最前面的点都在u的下面 也就是当u断开的时候,u之前的点与以v为根的子树必然分成两个独立的块 那么这个时候u就是割点 Network A Telephone Line Company (TLC) is estab…
Network Time Limit: 1000MS Memory Limit: 10000K Total Submissions: 11378 Accepted: 5285 Description A Telephone Line Company (TLC) is establishing a new telephone cable network. They are connecting several places numbered by integers from 1 to N…
Network Time Limit: 1000MS Memory Limit: 10000K Total Submissions: 11914 Accepted: 5519 Description A Telephone Line Company (TLC) is establishing a new telephone cable network. They are connecting several places numbered by integers from 1 to N…
Network Time Limit: 1000MS Memory Limit: 10000K Total Submissions: 12521 Accepted: 5760 Description A Telephone Line Company (TLC) is establishing a new telephone cable network. They are connecting several places numbered by integers from 1 to N…
Network Time Limit: 1000MS Memory Limit: 10000K Total Submissions: 12551 Accepted: 5771 Description A Telephone Line Company (TLC) is establishing a new telephone cable network. They are connecting several places numbered by integers from 1 to N…