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A Serval and Bus It is raining heavily. But this is the first day for Serval, who just became 3 years old, to go to the kindergarten. Unfortunately, h 阅读全文
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A Game 23 Polycarp plays "Game 23". Initially he has a number n and his goal is to transform it to m. In one move, he can multiply n by 2 or multiply 阅读全文
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Max Sum Given a sequence a[1],a[2],a[3]......a[n], your job is to calculate the max sum of a sub sequence. For example, given (6, 1,5,4, 7), the max s 阅读全文
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A Diverse Strings A string is called diverse if it contains consecutive (adjacent) letters of the Latin alphabet and each letter occurs exactly once. 阅读全文