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79. Word Search Given a 2D board and a word, find if the word exists in the grid. The word can be constructed from letters of sequentially adjacent ce 阅读全文
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78. Subsets Given a set of distinct integers, nums, return all possible subsets (the power set). Note: The solution set must not contain duplicate sub 阅读全文
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77. Combinations Given two integers n and k, return all possible combinations of k numbers out of 1 ... n. Example: 阅读全文
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76. Minimum Window Substring Given a string S and a string T, find the minimum window in S which will contain all the characters in T in complexity O( 阅读全文
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75. Sort Colors Given an array with n objects colored red, white or blue, sort them in-place so that objects of the same color are adjacent, with the 阅读全文
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74. Search a 2D Matrix Write an efficient algorithm that searches for a value in an m x n matrix. This matrix has the following properties: Integers i 阅读全文