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Problem Definition：Implement next permutation, which rearranges numbers into the lexicographically next greater permutation of numbers.If such arrange... 阅读全文
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Problem Definition:Divide two integers without using multiplication, division and mod operator.If it is overflow, return MAX_INT.Solution：就是要用加减和位操作之类... 阅读全文
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Problem Definition:Given a linked list, swap every two adjacent nodes and return its head. For example,Given 1->2->3->4, you should return the list as... 阅读全文
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Problem Definition:Given n pairs of parentheses, write a function to generate all combinations of well-formed parentheses.For example, given n = 3, a ... 阅读全文
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Problem Definition:Given an array S of n integers, are there elements a, b, c, and d in S such that a + b + c + d = target? Find all unique quadruplet... 阅读全文