Leetcode#80 Remove Duplicates from Sorted Array II

 1 int removeDuplicates(int A[], int n) {
 2         if (n == 0) return n;
 3         
 4         int len = 1;
 5         int dupSum = 1;
 6         
 7         for (int i = 1; i < n; i++) {
 8             if (A[i] == A[i - 1]) {
 9                 dupSum++;
10             }
11             else
12                 dupSum = 1;
13             if (dupSum <= 2) {
14                 A[len] = A[i];
15                 len++;
16             }
17         }
18         
19         return len;
20 }