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29 lines
885 B
HTML
29 lines
885 B
HTML
<p>Given an array of integers arr, find the sum of <code>min(b)</code>, where <code>b</code> ranges over every (contiguous) subarray of <code>arr</code>. Since the answer may be large, return the answer <strong>modulo</strong> <code>10<sup>9</sup> + 7</code>.</p>
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<p> </p>
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<p><strong>Example 1:</strong></p>
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<pre>
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<strong>Input:</strong> arr = [3,1,2,4]
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<strong>Output:</strong> 17
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<strong>Explanation:</strong>
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Subarrays are [3], [1], [2], [4], [3,1], [1,2], [2,4], [3,1,2], [1,2,4], [3,1,2,4].
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Minimums are 3, 1, 2, 4, 1, 1, 2, 1, 1, 1.
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Sum is 17.
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</pre>
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<p><strong>Example 2:</strong></p>
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<pre>
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<strong>Input:</strong> arr = [11,81,94,43,3]
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<strong>Output:</strong> 444
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</pre>
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<p> </p>
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<p><strong>Constraints:</strong></p>
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<ul>
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<li><code>1 <= arr.length <= 3 * 10<sup>4</sup></code></li>
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<li><code>1 <= arr[i] <= 3 * 10<sup>4</sup></code></li>
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</ul>
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