LeetCode 476. Number Complement

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

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 complement is 0. So you need to output 0.
class Solution {
public:
    int findComplement(int num) {
        int temp=0, i=0;
        while(num!=0){
            if(num%2==0)
               temp+=pow(2,i);
            num/=2;
            i++;
        }
        return temp;
    }
};
posted @ 2018-12-04 21:45  A-Little-Nut  阅读(140)  评论(0编辑  收藏  举报