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Maximum Unique Subarray

Given an array of integers, find the maximum sum of a subarray that contains all unique elements. If the array is empty, return 0. Input: - A single line containing n (1 <= n <= 100,000) integers. Output: - Print the maximum sum of subarrays with unique elements. Example: Input: 4 5 6 4 2 5 1 Output: 18

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