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    1. class Solution {
    2. public:
    3.     int NumberOf1(int n) {
    4.         unsigned num = n;
    5.         int count = 0;
    6.         while(num){
    7.             if((num&1) == 1) count++;
    8.             num >>= 1;
    9.         }
    10.         return count;
    11.     }
    12. };