老规矩，抄一波QSC，自己的写在后面   E. Bear and Forgotten Tree 2 题目连接： http://www.codeforces.com/contest/653/problem/E Description A tree is a connected undirected graph consisting of n vertices and n  -  1 edges.

更多ruoyi-nbcio功能请看演示系统 gitee源代码地址 前后端代码： https://gitee.com/nbacheng/ruoyi-nbcio 演示地址：RuoYi-Nbcio后台管理系统 更多nbcio-boot功能请看演示系统 gitee源代码地址 后端代码： https://gitee.com/nbacheng/nbcio-boot 前端代码：https://gi

题目链接：http://codeforces.com/problemset/problem/657/A Bear and Forgotten Tree 3 time limit per test: 2 seconds memory limit per test: 256 megabytes input: standard input output: sta

Bear and Forgotten Tree 3 time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output A tree is a connected undirected graph cons