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A message containing letters fromA-Zis being encoded to numbers using the following mapping:'A' -> 1'B' -> 2...'Z' -> 26Given an encoded message conta... 阅读全文
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1.The Art of Computer Programming 这部书被誉为20世纪最重要的20部著作之一,与Einstein的>并列,是计算机科学领域的权威著作.全书共分7卷,目前已经出版了3卷,被誉为"计算机程序设计理论的荷马史诗","可与牛顿的>媲美的巨著".作者数学方面的功底造就了本书严... 阅读全文
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Givennpairs of parentheses, write a function to generate all combinations of well-formed parentheses.For example, givenn= 3, a solution set is:"((()))... 阅读全文
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Givennnon-negative integersa1,a2, ...,an, where each represents a point at coordinate (i,ai).nvertical lines are drawn such that the two endpoints of ... 阅读全文