Given an array of size N containing only 0s, 1s, and 2s; sort the array in ascending order.

Example 1:

Input: 
N = 5
arr[]= {0 2 1 2 0}
Output: 0 0 1 2 2
Explanation: 0s 1s and 2s are segregated 
into ascending order.

Example 2:

Input: 
N = 3
arr[] = {0 1 0}
Output: 0 0 1
Explanation: 0s 1s and 2s are segregated 
into ascending order.

Your Task:
You don't need to read input or print anything. Your task is to complete the function sort012() that takes array and n as input parameters and sorts the array in-place. 

Expected Time Complexity: O(n)
Expected Auxiliary Space: O(1)

Constraints:
1 <= N <= 10^5
0 <= A[i] <= 2