Given a positive integer, output its complement number. The complement strategy is to flip the bits of its binary representation.

Note:

1. The given integer is guaranteed to fit within the range of a 32-bit signed integer.
2. You could assume no leading zero bit in the integer’s binary representation.

Example 1:

Input: 5Output: 2Explanation: The binary representation of 5 is 101 (no leading zero bits), and its complement is 010. So you need to output 2.

Example 2:

Input: 1Output: 0Explanation: The binary representation of 1 is 1 (no leading zero bits), and its complement is 0. So you need to output 0.

这两个数相加是 2^n - 1 这种形式的所以可以这个么做

class Solution {public:    int findComplement(int num) {        int n = 0;        while (n < num) {            n = (n<<1)|1;        }        return n - num;    }};

476. Number Complement