数的补数 Number Complement
问题: Given a positive integer, output its complement number. T he complement strategy is to flip the bits of its binary representation.(输出每个数的补码,实际上根据示例是要求实现按位取反) Note: The given integer is guaranteed to fit within the range of a 32-bit signed integer. You could assume no leading zero bit in the integer’s binary representation. Example 1: Input: 5 Output: 2 Explanation: 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: 1 Output: 0 Explanation: The binary representation of 1 is 1 (no leading zero bits), and its