Remove Duplicates from Sorted Array

Given a sorted array, remove the duplicates in place such that each element appear only once and return the new length.

Do not allocate extra space for another array, you must do this in place with constant memory.

For example,
Given input array A = [1,1,2],

Your function should return length = 2, and A is now [1,2].

Solution:

Simply implementaiton with two pointers. But one is used in the for loop, so only one other pointer is needed. 

Code:

    int removeDuplicates(int A[], int n) {

            int cval;  // current compare value

    int cnt;

    if (n==0 || n==1) return n;

    cval = A[0];

    cnt=1;

    for(int i=1; i

    {

        if(A[i]!=cval)

        {

             A[cnt]=A[i];

             cnt++;

            cval=A[i];

        }

    }

    return cnt;

    }