Remove_Element.cpp

class Solution {
public:
    int removeElement(int A[], int n, int elem) {
        int i = 0;
        int j = 0;
        
        while(j < n){
            if(A[j] == elem){
                j++;
            }else{
                A[i++] = A[j++];
            }
        }
        return i;
    }
};