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https://gitee.com/coder-xiaomo/leetcode-problemset
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192 lines
27 KiB
JSON
192 lines
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"title": "Find the Number of Subarrays Where Boundary Elements Are Maximum",
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"content": "<p>You are given an array of <strong>positive</strong> integers <code>nums</code>.</p>\n\n<p>Return the number of <span data-keyword=\"subarray-nonempty\">subarrays</span> of <code>nums</code>, where the <strong>first</strong> and the <strong>last</strong> elements of the subarray are <em>equal</em> to the <strong>largest</strong> element in the subarray.</p>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">nums = [1,4,3,3,2]</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">6</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p>There are 6 subarrays which have the first and the last elements equal to the largest element of the subarray:</p>\n\n<ul>\n\t<li>subarray <code>[<strong><u>1</u></strong>,4,3,3,2]</code>, with its largest element 1. The first element is 1 and the last element is also 1.</li>\n\t<li>subarray <code>[1,<u><strong>4</strong></u>,3,3,2]</code>, with its largest element 4. The first element is 4 and the last element is also 4.</li>\n\t<li>subarray <code>[1,4,<u><strong>3</strong></u>,3,2]</code>, with its largest element 3. The first element is 3 and the last element is also 3.</li>\n\t<li>subarray <code>[1,4,3,<u><strong>3</strong></u>,2]</code>, with its largest element 3. The first element is 3 and the last element is also 3.</li>\n\t<li>subarray <code>[1,4,3,3,<u><strong>2</strong></u>]</code>, with its largest element 2. The first element is 2 and the last element is also 2.</li>\n\t<li>subarray <code>[1,4,<u><strong>3,3</strong></u>,2]</code>, with its largest element 3. The first element is 3 and the last element is also 3.</li>\n</ul>\n\n<p>Hence, we return 6.</p>\n</div>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">nums = [3,3,3]</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">6</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p>There are 6 subarrays which have the first and the last elements equal to the largest element of the subarray:</p>\n\n<ul>\n\t<li>subarray <code>[<u><strong>3</strong></u>,3,3]</code>, with its largest element 3. The first element is 3 and the last element is also 3.</li>\n\t<li>subarray <code>[3,<strong><u>3</u></strong>,3]</code>, with its largest element 3. The first element is 3 and the last element is also 3.</li>\n\t<li>subarray <code>[3,3,<u><strong>3</strong></u>]</code>, with its largest element 3. The first element is 3 and the last element is also 3.</li>\n\t<li>subarray <code>[<strong><u>3,3</u></strong>,3]</code>, with its largest element 3. The first element is 3 and the last element is also 3.</li>\n\t<li>subarray <code>[3,<u><strong>3,3</strong></u>]</code>, with its largest element 3. The first element is 3 and the last element is also 3.</li>\n\t<li>subarray <code>[<u><strong>3,3,3</strong></u>]</code>, with its largest element 3. The first element is 3 and the last element is also 3.</li>\n</ul>\n\n<p>Hence, we return 6.</p>\n</div>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">nums = [1]</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">1</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p>There is a single subarray of <code>nums</code> which is <code>[<strong><u>1</u></strong>]</code>, with its largest element 1. The first element is 1 and the last element is also 1.</p>\n\n<p>Hence, we return 1.</p>\n</div>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= nums.length <= 10<sup>5</sup></code></li>\n\t<li><code>1 <= nums[i] <= 10<sup>9</sup></code></li>\n</ul>\n",
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"translatedTitle": "边界元素是最大值的子数组数目",
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"translatedContent": "<p>给你一个 <strong>正</strong> 整数数组 <code>nums</code> 。</p>\n\n<p>请你求出 <code>nums</code> 中有多少个子数组,满足子数组中 <strong>第一个</strong> 和 <strong>最后一个</strong> 元素都是这个子数组中的 <strong>最大</strong> 值。</p>\n\n<p> </p>\n\n<p><strong class=\"example\">示例 1:</strong></p>\n\n<div class=\"example-block\">\n<p><span class=\"example-io\"><b>输入:</b>nums = [1,4,3,3,2]</span></p>\n\n<p><span class=\"example-io\"><b>输出:</b>6</span></p>\n\n<p><strong>解释:</strong></p>\n\n<p>总共有 6 个子数组满足第一个元素和最后一个元素都是子数组中的最大值:</p>\n\n<ul>\n\t<li>子数组 <code>[<u><em><strong>1</strong></em></u>,4,3,3,2]</code> ,最大元素为 1 ,第一个和最后一个元素都是 1 。</li>\n\t<li>子数组 <code>[1,<u><em><strong>4</strong></em></u>,3,3,2]</code> ,最大元素为 4 ,第一个和最后一个元素都是 4 。</li>\n\t<li>子数组 <code>[1,4,<u><em><strong>3</strong></em></u>,3,2]</code> ,最大元素为 3 ,第一个和最后一个元素都是 3 。</li>\n\t<li>子数组 <code>[1,4,3,<u><em><strong>3</strong></em></u>,2]</code> ,最大元素为 3 ,第一个和最后一个元素都是 3 。</li>\n\t<li>子数组 <code>[1,4,3,3,<u><em><strong>2</strong></em></u>]</code> ,最大元素为 2 ,第一个和最后一个元素都是 2 。</li>\n\t<li>子数组 <code>[1,4,<u><em><strong>3,3</strong></em></u>,2]</code> ,最大元素为 3 ,第一个和最后一个元素都是 3 。</li>\n</ul>\n\n<p>所以我们返回 6 。</p>\n</div>\n\n<p><strong class=\"example\">示例 2:</strong></p>\n\n<div class=\"example-block\">\n<p><span class=\"example-io\"><b>输入:</b>nums = [3,3,3]</span></p>\n\n<p><span class=\"example-io\"><b>输出:</b>6</span></p>\n\n<p><strong>解释:</strong></p>\n\n<p>总共有 6 个子数组满足第一个元素和最后一个元素都是子数组中的最大值:</p>\n\n<ul>\n\t<li>子数组 <code>[<u><em><strong>3</strong></em></u>,3,3]</code> ,最大元素为 3 ,第一个和最后一个元素都是 3 。</li>\n\t<li>子数组 <code>[3,<u><em><strong>3</strong></em></u>,3]</code> ,最大元素为 3 ,第一个和最后一个元素都是 3 。</li>\n\t<li>子数组 <code>[3,3,<u><em><strong>3</strong></em></u>]</code> ,最大元素为 3 ,第一个和最后一个元素都是 3 。</li>\n\t<li>子数组 <code>[<u><em><strong>3,3</strong></em></u>,3]</code> ,最大元素为 3 ,第一个和最后一个元素都是 3 。</li>\n\t<li>子数组 <code>[3,<u><em><strong>3,3</strong></em></u>]</code> ,最大元素为 3 ,第一个和最后一个元素都是 3 。</li>\n\t<li>子数组 <code>[<u><em><strong>3,3,3</strong></em></u>]</code> ,最大元素为 3 ,第一个和最后一个元素都是 3 。</li>\n</ul>\n\n<p>所以我们返回 6 。</p>\n</div>\n\n<p><strong class=\"example\">示例 3:</strong></p>\n\n<div class=\"example-block\">\n<p><span class=\"example-io\"><b>输入:</b>nums = [1]</span></p>\n\n<p><span class=\"example-io\"><b>输出:</b>1</span></p>\n\n<p><strong>解释:</strong></p>\n\n<p><code>nums</code> 中只有一个子数组 <code>[<em><strong>1</strong></em>]</code> ,最大元素为 1 ,第一个和最后一个元素都是 1 。</p>\n\n<p>所以我们返回 1 。</p>\n</div>\n\n<p> </p>\n\n<p><strong>提示:</strong></p>\n\n<ul>\n\t<li><code>1 <= nums.length <= 10<sup>5</sup></code></li>\n\t<li><code>1 <= nums[i] <= 10<sup>9</sup></code></li>\n</ul>\n",
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