Remove Duplicates from Sorted Array II

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