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D. Array GCD 题目连接: http://codeforces.com/contest/624/problem/D Description You are given array ai of length n. You may consecutively apply two operati 阅读全文
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C. Graph and String 题目连接: http://codeforces.com/contest/624/problem/C Description One day student Vasya was sitting on a lecture and mentioned a strin 阅读全文
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B. Making a String 题目连接: http://codeforces.com/contest/624/problem/B Description You are given an alphabet consisting of n letters, your task is to ma 阅读全文
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A. Save Luke 题目连接: http://codeforces.com/contest/624/problem/A Description Luke Skywalker got locked up in a rubbish shredder between two presses. R2D 阅读全文