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题目描述 Farmer John's N cows (2≤N≤100), conveniently numbered 1…N as always, happen to have too much time on their hooves. As a result, they have worked 阅读全文
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题目描述 Jim Ratt has just joined a local fitness center. He’s especially excited about a sequence of 10 machines that he cycles through three times for h 阅读全文
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题目描述 很久很久以前,森林里住着一群兔子。有一天,兔子们想要研究自己的 DNA 序列。我们首先选取一个好长好长的 DNA 序列(小兔子是外星生物,DNA 序列可能包含 26 个小写英文字母),然后我们每次选择两个区间,询问如果用两个区间里的 DNA 序列分别生产出来两只兔子,这两个兔子是否一模一样 阅读全文