mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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180 lines
19 KiB
JSON
180 lines
19 KiB
JSON
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"categoryTitle": "Algorithms",
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"title": "Sum of Subarray Minimums",
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"content": "<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>\n\n<p> </p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> arr = [3,1,2,4]\n<strong>Output:</strong> 17\n<strong>Explanation:</strong> \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</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> arr = [11,81,94,43,3]\n<strong>Output:</strong> 444\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= arr.length <= 3 * 10<sup>4</sup></code></li>\n\t<li><code>1 <= arr[i] <= 3 * 10<sup>4</sup></code></li>\n</ul>\n",
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"translatedTitle": "子数组的最小值之和",
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"translatedContent": "<p>给定一个整数数组 <code>arr</code>，找到 <code>min(b)</code> 的总和，其中 <code>b</code> 的范围为 <code>arr</code> 的每个（连续）子数组。</p>\n\n<p>由于答案可能很大，因此<strong> 返回答案模 <code>10^9 + 7</code></strong> 。</p>\n\n<p> </p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre>\n<strong>输入：</strong>arr = [3,1,2,4]\n<strong>输出：</strong>17\n<strong>解释：\n</strong>子数组为<strong> </strong>[3]，[1]，[2]，[4]，[3,1]，[1,2]，[2,4]，[3,1,2]，[1,2,4]，[3,1,2,4]。 \n最小值为 3，1，2，4，1，1，2，1，1，1，和为 17。</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre>\n<strong>输入：</strong>arr = [11,81,94,43,3]\n<strong>输出：</strong>444\n</pre>\n\n<p> </p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 <= arr.length <= 3 * 10<sup>4</sup></code></li>\n\t<li><code>1 <= arr[i] <= 3 * 10<sup>4</sup></code></li>\n</ul>\n\n<p> </p>\n",
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