LeetCode – Refresh – Remove Duplicates from Sorted Array

class Solution {
public:
    int removeDuplicates(int A[], int n) {
        if (n < 2) return n;
        int rec = A[0], index = 1;
        for (int i = 1; i < n; i++) {
            if (A[i] != rec) {
                A[index++] = A[i];
                rec = A[i];
            }
        }
        return index;
    }
};