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[codeforces 339]E. Three Swaps 试题描述 Xenia the horse breeder has n (n > 1) horses that stand in a row. Each horse has its own unique number. Initially, 阅读全文
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[codeforces 339]D. Xenia and Bit Operations 试题描述 Xenia the beginner programmer has a sequence a, consisting of 2n non-negative integers: a1, a2, ..., 阅读全文
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[codeforces 360]A. Levko and Array Recovery 试题描述 Levko loves array a1, a2, ... , an, consisting of integers, very much. That is why Levko is playing w 阅读全文