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