Maximum XOR Suffix

Problem Overview

• Given an integer array, you may repeatedly pick an index, compute the XOR of the suffix (index to end), append it, and seek the highest achievable value in the array.
• Input: arr[n]; Output: the maximum possible value; Constraints: 1 ≤ n ≤ 1e5, 0 ≤ arr[i] < 2^30.
• Domain: arrays and bitwise XOR; sequence extension via allowed operations.
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