{ "data": { "question": { "questionId": "943", "questionFrontendId": "907", "boundTopicId": null, "title": "Sum of Subarray Minimums", "titleSlug": "sum-of-subarray-minimums", "content": "

Given an array of integers arr, find the sum of min(b), where b ranges over every (contiguous) subarray of arr. Since the answer may be large, return the answer modulo 109 + 7.

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Example 1:

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\nInput: arr = [3,1,2,4]\nOutput: 17\nExplanation: \nSubarrays are [3], [1], [2], [4], [3,1], [1,2], [2,4], [3,1,2], [1,2,4], [3,1,2,4]. \nMinimums are 3, 1, 2, 4, 1, 1, 2, 1, 1, 1.\nSum is 17.\n
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Example 2:

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\nInput: arr = [11,81,94,43,3]\nOutput: 444\n
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Constraints:

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