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题 题意 n个表示abc三个字符的点，所有a和b是相连的，所有b和c是相连的，所有相同的是相连的，现在给你n个点和他们之间的m条边，判断是否存在这样的字符串，存在则给出一个符合条件的。 分析 我的做法是找出所有的b，因为b是只和自己本身没有连接，所以有n-1个连线，然后找出第一个不是b的，然后所有和 阅读全文
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题 Today, Wet Shark is given n integers. Using any of these integers no more than once, Wet Shark wants to get maximum possible even (divisible by 2) s 阅读全文
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题 There are 2N white balls on a table in two rows, making a nice 2-by-N rectangle. Jon has a big paint bucketfull of black paint. (Don’t ask why.) He 阅读全文
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题 There are n sharks who grow flowers for Wet Shark. They are all sitting around the table, such that sharks i andi + 1 are neighbours for all i from 阅读全文
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题 You are given array ai of length n. You may consecutively apply two operations to this array: remove some subsegment (continuous subsequence) of len 阅读全文