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Problem Description Given a positive integer N, your task is to calculate the sum of the positive integers less than N which are not coprime to N. A i 阅读全文
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Problem Description "Well, it seems the first problem is too easy. I will let you know how foolish you are later." feng5166 says. "The second problem 阅读全文
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Problem Description Many years ago , in Teddy’s hometown there was a man who was called “Bone Collector”. This man like to collect varies of bones , s 阅读全文
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Problem Description Given a positive integer N, you should output the leftmost digit of N^N. Input The input contains several test cases. The first li 阅读全文
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Problem Description Give you two numbers A and B, if A is equal to B, you should print "YES", or print "NO". Input 这道题目,刚开始做的时候我只考虑开头的时候有+这种情况,想错了,这道题 阅读全文
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Problem Description XX星有许多城市,城市之间通过一种奇怪的高速公路SARS(Super Air Roam Structure 超级空中漫游结构)进行交流,每条SARS都对行驶在上面的Flycar限制了固定的Speed,同时XX星人对 Flycar的“舒适度”有特殊要求,即乘坐过 阅读全文
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Problem Description Here is a game for two players. The rule of the game is described below: ● In the beginning of the game, there are a lot of piles 阅读全文