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Leetcode 1856. Maximum Subarray Min-Product
Find the maximum value of (minimum element of a contiguous subarray) × (sum of that subarray) over all non-empty subarrays and return it mod 1e9+7. Key insight: for each element treated as the subarray minimum, use a monotonic stack to find its maximal span and prefix sums to compute the sum efficiently (n up to 1e5).
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