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DescriptionBefore the invention of book-printing, it was very hard to make a copy of a book. All the contents had to be re-written by hand by so calle... 阅读全文
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DescriptionOnce Bob took a paper stripe ofnsquares (the height of the stripe is 1 square). In each square he wrote an integer number, possibly negativ... 阅读全文
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DescriptionVanya walks late at night along a straight street of lengthl, lit bynlanterns. Consider the coordinate system with the beginning of the str... 阅读全文
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题意： bobo has a sequence a1,a2,…,an. He is allowed to swap twoadjacentnumbers for no more than k times.Find the minimum number of inversions after his ... 阅读全文