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Leetcode 2913. Subarrays Distinct Element Sum of Squares I
Return the sum, over all non-empty contiguous subarrays of nums, of the square of the number of distinct values in each subarray. The core challenge is counting distinct elements per subarray; with n ≤ 100 (values ≤ 100) brute-force enumeration of subarrays is acceptable.
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