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I’m out of stories. For years I’ve been writing stories, some rather silly, just to make simple problems look difficult and complex problems look easy 阅读全文
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E - Parentheses Balance You are given a string consisting of parentheses () and []. A string of this type is said to be correct: (a) if it is the empt 阅读全文
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题目: Ugly numbers are numbers whose only prime factors are 2, 3 or 5 . The sequence 1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, ... shows the first 11 ugly num 阅读全文
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I have a very simple problem for you. Given two integers A and B, your job is to calculate the Sum of A + B. Input The first line of the input contain 阅读全文