class Solution {
public:
    int removeElement(vector<int> &nums) {
        if(nums.size() == 0) {
            return 0;
        }
        int slow = 0,fast = 0;
        while(fast < nums.size()) {
            if(nums[fast] != 0) {
                nums[slow] = nums[fast];
                slow++;
            }
            fast++;
        }
        return slow;
    }
    void moveZeroes(vector<int>& nums) {
       int p = removeElement(nums);
       while(p<nums.size()){
           nums[p] = 0;
           p++;
       }
    }
};