meeting(类似树的直径问题,两次bfs或树形dp)
链接:https://ac.nowcoder.com/acm/contest/884/A来源:牛客网时间限制:C/C++ 1秒,其他语言2秒空间限制:C/C++ 524288K,其他语言1048576K64bit IO Format: %lld题目描述A new city has just been built. There'rennninteresting places...