摘要：
题目链接: http://poj.org/problem?id=1679 Description Given a connected undirected graph, tell if its minimum spanning tree is unique. Definition 1 (Spanni 阅读全文
摘要：
题目链接: http://acm.zju.edu.cn/onlinejudge/showProblem.do?problemCode=1610 Description Painting some colored segments on a line, some previously painted 阅读全文