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题目: There are two strings A and B with equal length. Both strings are made up of lower case letters.Now you have a powerful string painter. With the h 阅读全文
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D. Substringtime limit per test3 secondsYou are given a graph with n nodes and m directed edges. One lowercase letter is assigned to each node. We def 阅读全文
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For example, when she see a number, she would think whether the digits of a number are strictly increasing. If you consider the number as a string and 阅读全文