1 class Solution { 2 public: 3     int removeElement(int A[], int n, int elem) { 4         int index = 0; 5         for (int i = 0; i < n; i++) { 6             if (A[i] != elem) { 7                 A[index++] = A[i]; 8             } 9         }10         return index;11     }12 };