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#268. Missing Number Given an array containing n distinct numbers taken from 0, 1, 2, ..., n, find the one that is missing from the array. For example 阅读全文
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#7. Reverse Integer Reverse digits of an integer. Example1: x = 123, return 321Example2: x = -123, return -321 题解：暴力做，注意边界： 阅读全文
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#190. Reverse Bits Reverse bits of a given 32 bits unsigned integer. For example, given input 43261596 (represented in binary as 000000101001010000011 阅读全文