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Problem DescriptionThere are two strings A and B with equal length. Both strings are made up of lower case letters. Now you have a pow... 阅读全文
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DescriptionThe cows are trying to become better athletes, so Bessie is running on a track for exactly N (1 ≤ N ≤ 10,000) minutes. Duri... 阅读全文
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DescriptionGappu has a very busy weekend ahead of him. Because, next weekend is Halloween, and he is planning to attend as many partie... 阅读全文
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DescriptionThe multiplication puzzle is played with a row of cards, each containing a single positive integer. During the move player ... 阅读全文
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DescriptionKeeping track of all the cows can be a tricky task so Farmer John has installed a system to automate it. He has installed o... 阅读全文
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Problem DescriptionT. E. Lawrence was a controversial figure during World War I. He was a British officer who served in the Arabian th... 阅读全文
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描述 暑假来了，hrdv 又要留学校在参加ACM集训了，集训的生活非常Happy（ps：你懂得），可是他最近遇到了一个难题，让他百思不得其解，他非常郁闷。。亲爱的你能帮帮他吗？ 问题是我们经常见到的整数划分，给出两个整数 n , m ,要求在 n... 阅读全文
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DescriptionLet us define a regular brackets sequence in the following way: 1. Empty sequence is a regular sequence. 2. If S is a regul... 阅读全文
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DescriptionWe give the following inductive definition of a “regular brackets” sequence:the empty sequence is a regular brackets sequen... 阅读全文
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Problem DescriptionCRB has two strings s and t.In each step, CRB can select arbitrary character c of s and insert any character d (d ≠... 阅读全文