LeetCode 0190 - Reverse Bits

Reck Zhang

发布于 2021-08-11 14:54:39

2020

发布于 2021-08-11 14:54:39

文章被收录于专栏：Reck Zhang

Reverse Bits

Desicription

Reverse bits of a given 32 bits unsigned integer.

Example:

Input: 43261596
Output: 964176192
Explanation: 43261596 represented in binary as 00000010100101000001111010011100, 
             return 964176192 represented in binary as 00111001011110000010100101000000.

Follow up:

If this function is called many times, how would you optimize it?

Solution

class Solution {
public:
    uint32_t reverseBits(uint32_t n) {
        n = (n >> 16) | (n << 16);
        n = ((n & 0xff00ff00) >> 8) | ((n & 0x00ff00ff) << 8);
        n = ((n & 0xf0f0f0f0) >> 4) | ((n & 0x0f0f0f0f) << 4);
        n = ((n & 0xcccccccc) >> 2) | ((n & 0x33333333) << 2);
        n = ((n & 0xaaaaaaaa) >> 1) | ((n & 0x55555555) << 1);
        return n;
    }
};

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原始发表：2018-06-11，如有侵权请联系 cloudcommunity@tencent.com 删除

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