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12.03 The Doors http://poj.org/problem?id=1556
12.04 Border http://acm.sgu.ru/problem.php?contest=0&problem=133
12.05 Centroid 题目大意:给定一棵树(N个节点,N-1条边)。对每个结点k,定义一个值value(k),表示把结点k从树中删除后,剩余的最大连通分量的结点数目。找出所有的value最小的结点。
链接:http://acm.sgu.ru/problem.php?contest=0&problem=134