Minimum XOR Pair Difference

Given an array of integers, find the two distinct elements in the array that produce the minimum XOR value and return that value. Your solution must run in O(n log n) time. Input format: The first line contains integer 'n' (2 <= n <= 1000). The second line contains 'n' space-separated integers. Output format: A single integer representing the minimum XOR value. Example: For input '4 4 1 2 3', the minimum XOR is obtained from pairs (2, 3) or (3, 2), both yielding '1'. So the output is '1'.