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202. Happy Number Write an algorithm to determine if a number is "happy". A happy number is a number defined by the following process: Starting with a 阅读全文
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198. House Robber You are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed, the only cons 阅读全文
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191. Number of 1 Bits Write a function that takes an unsigned integer and returns the number of ’1' bits it has (also known as the Hamming weight). Fo 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 0000001010010100000111 阅读全文