LeetCode – Refresh – Remove Duplicates from Sorted Array

 1 class Solution {
 2 public:
 3     int removeDuplicates(int A[], int n) {
 4         if (n < 2) return n;
 5         int rec = A[0], index = 1;
 6         for (int i = 1; i < n; i++) {
 7             if (A[i] != rec) {
 8                 A[index++] = A[i];
 9                 rec = A[i];
10             }
11         }
12         return index;
13     }
14 };