leetcode 283. Move Zeroes

class Solution {
public:
    void moveZeroes(vector<int>& nums) {
        int flag = 0;
        int i = 0;
        while(i < nums.size()){
            if(nums[i] != 0)
                nums[flag++] = nums[i];
            i++;
        }
        while(flag < i)
            nums[flag++] = 0;
    }
};