Reverse BitsReverse bits of a given 32 bits unsigned integer.

For example, given input 43261596 (represented in binary as

00000010100101000001111010011100), return 964176192 (represented in binary as00111001011110000010100101000000).

Follow up:

If this function is called many times, how would you optimize it?Related problem: Reverse Integer

Credits:

Special thanks to @ts for adding this problem and creating all test cases.

Reverse the bits sequence.

class Solution { public: uint32_t reverseBits(uint32_t n) { uint32_t ans = 0; for(size_t i = 0; i < 32; i++){ uint32_t bit = ((0x00000001 << i) & n) >> i; ans = ans | (bit << (31 - i)); } return ans; } };

Use lookup table to speed up this program.