[LeetCode] Reverse Bits

阿新 • • 發佈：2017-12-07

time ted res ive this pre color its int

Reverse bits of a given 32 bits unsigned integer.

For example, given input 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?

class Solution {
public:
    uint32_t reverseBits(uint32_t n) {
        uint32_t res  
= 0;
        for (int i = 0; i < 32; i++) 
            res = (res << 1) + (n >> i & 1);
        return res;
    }
};
// 3 ms

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