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31. Next Permutation Implement next permutation, which rearranges numbers into the lexicographically next greater permutation of numbers. If such arra 阅读全文
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30. Substring with Concatenation of All Words You are given a string, s, and a list of words, words, that are all of the same length. Find all startin 阅读全文
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29. Divide Two Integers Divide two integers without using multiplication, division and mod operator. If it is overflow, return MAX_INT. 这题真的无能为力，js写法一 阅读全文