Reverse Bits

<-E 190> Reverse Bits

class Solution {
public:
    uint32_t reverseBits(uint32_t n) {
        uint32_t ret = 0;
        for(int i = 31; i >= 0; i--) {
            ret |= ((1 & n) << i);
            n = n >> 1;
        }
        return ret;
    }
};