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题目: Problem Description Ignatius has just come back school from the 30th ACM/ICPC. Now he has a lot of homework to do. Every teacher gives him a deadl 阅读全文
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题目: Problem Description Coco has a tree, whose vertices are conveniently labeled by 1,2,…,n.There are m chain on the tree, Each chain has a certain we 阅读全文
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题目: Problem Description It is well known that a human gene can be considered as a sequence, consisting of four nucleotides, which are simply denoted b 阅读全文