class Solution{
    public: 
        int removeELement(vector<int>& nums, int val){
            int k = 0;
            for(int i = 0;i<nums.size();i++){
                if(nums[i]!=val)
                    nums[k++] = nums[i];
                
            }
            return k;
        }
};
// i-> scans every element
// k-> stores only valid(!=val) elements