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Maximum AND Value
Medium Accuracy: 44.82% Submissions: 12082 Points: 4

Given an array arr[] of N positive elements. The task is to find the Maximum AND Value generated by any pair of element from the array.
Note: AND is bitwise '&' operator.


Example 1:

Input: 
N = 4
arr[] = {4, 8, 12, 16}
Output: 8
Explanation:
Pair (8,12) has the Maximum AND Value 8.

Example 2:

Input:
N = 4
arr[] = {4, 8, 16, 2}
Output: 0
Explanation: Maximum AND Value is 0.

Your Task: 
You don't need to read input or print anything. Your task is to complete the function maxAND() which takes the array elements and N (size of the array) as input parameters and returns the maximum AND value generated by any pair in the array. 

Expected Time Complexity: O(N * log M), where M is the maximum element of the array.

Expected Auxiliary Space: O(1).

Constraints:

1 <= N <= 105
1 <= arr[i] <= 105

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Maximum AND Value

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