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Reverse Bits

2015-08-16 14:41 288 查看

Description:


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?


Solution:

class Solution {
public:
uint32_t reverseBits(uint32_t n) {
n = (n & 0xffff0000) >> 16 | (n & 0x0000ffff) << 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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