public:
    int removeElement(vector<int>& nums, int val) {
        int freq = 0;
        for (int i=0; i< nums.size(); i++){
            if (nums[i] == val){
                freq++;
            } else{
                nums[i - freq] = nums[i];
            }
        }
    return (nums.size() -freq);
    }
};