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题目链接： C. Nearest vectors You are given the set of vectors on the plane, each of them starting at the origin. Your task is to find a pair of vectors wi 阅读全文
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题目链接： E. Chocolate Bar You have a rectangular chocolate bar consisting of n × m single squares. You want to eat exactly k squares, so you may need to 阅读全文
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题目链接： C. Bear and Up-Down The life goes up and down, just like nice sequences. Sequence t1, t2, ..., tn is called nice if the following two conditions 阅读全文