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Havel定理描述给定一个非负整数序列{d1,d2,...dn}，若存在一个无向图使得图中各点的度与此序列一一对应，则称此序列可图化。进一步，若图为简单图，则称此序列可简单图化。可图化的判定比较简单：d1+d2+...dn=0(mod2)。关于具体图的构造，我们可以简单地把奇数度的点配对，剩下的全部搞成自环。可简单图化的判定，有一个Havel定理，是说: 我们把序列排成

题目：Frogs' NeighborhoodTime Limit: 5000MS Memory Limit: 10000KTotal Submissions: 9932 Accepted: 4152 Special JudgeDescription未名湖附近共有N个大小湖泊L1, L2,

Problem Description Your platoon of wandering lizards has entered a strange room in the labyrinth you are exploring. As you are looking around for hidden treasures, one of the rookies steps