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D. Swaps in Permutation 题目连接: http://www.codeforces.com/contest/691/problem/D Description You are given a permutation of the numbers 1, 2, ..., n and 阅读全文
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C. Exponential notation 题目连接: http://www.codeforces.com/contest/691/problem/C Description You are given a positive decimal number x. Your task is to c 阅读全文
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B. s palindrome 题目连接: http://www.codeforces.com/contest/691/problem/B Description Let's call a string "s palindrome" if it is symmetric about the midd 阅读全文