题目比较简单. 注意看测试用例2,给的提示 Please note that this is the largest possible return value: whenever there is a solution, there is a solution that uses at most two moves. 最多只有两步 #include <vector> #include <string> #include <list> #include <map&…
周赛时遇到的一道比较有意思的题目: Problem Statement There are N rooms in Maki's new house. The rooms are numbered from 0 to N-1. Some pairs of rooms are connected by bidirectional passages. The passages have the topology of a tree. That is, there are exactly N-…