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Find Transition Point
Easy Accuracy: 53.15% Submissions: 56473 Points: 2

Given a sorted array containing only 0s and 1s, find the transition point. 

Example 1:

N = 5
arr[] = {0,0,0,1,1}
Output: 3
Explanation: index 3 is the transition 
point where 1 begins.

Example 2:

N = 4
arr[] = {0,0,0,0}
Output: -1
Explanation: Since, there is no "1",
the answer is -1.

Your Task:
You don't need to read input or print anything. The task is to complete the function transitionPoint() that takes array and N as input parameters and returns the 0 based index of the position where "0" ends and "1" begins. If array does not have any 1s, return -1. If array does not have any 0s, return 0.

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

1 ≤ N ≤ 500000
0 ≤ arr[i] ≤ 1

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