leetcode-problemset/leetcode-cn/originData/count-the-number-of-good-subarrays.json

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        "question": {
            "questionId": "2626",
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            "title": "Count the Number of Good Subarrays",
            "titleSlug": "count-the-number-of-good-subarrays",
            "content": "<p>Given an integer array <code>nums</code> and an integer <code>k</code>, return <em>the number of <strong>good</strong> subarrays of</em> <code>nums</code>.</p>\n\n<p>A subarray <code>arr</code> is <strong>good</strong> if it there are <strong>at least </strong><code>k</code> pairs of indices <code>(i, j)</code> such that <code>i &lt; j</code> and <code>arr[i] == arr[j]</code>.</p>\n\n<p>A <strong>subarray</strong> is a contiguous <strong>non-empty</strong> sequence of elements within an array.</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> nums = [1,1,1,1,1], k = 10\n<strong>Output:</strong> 1\n<strong>Explanation:</strong> The only good subarray is the array nums itself.\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> nums = [3,1,4,3,2,2,4], k = 2\n<strong>Output:</strong> 4\n<strong>Explanation:</strong> There are 4 different good subarrays:\n- [3,1,4,3,2,2] that has 2 pairs.\n- [3,1,4,3,2,2,4] that has 3 pairs.\n- [1,4,3,2,2,4] that has 2 pairs.\n- [4,3,2,2,4] that has 2 pairs.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= nums.length &lt;= 10<sup>5</sup></code></li>\n\t<li><code>1 &lt;= nums[i], k &lt;= 10<sup>9</sup></code></li>\n</ul>\n",
            "translatedTitle": "统计好子数组的数目",
            "translatedContent": "<p>给你一个整数数组 <code>nums</code>&nbsp;和一个整数 <code>k</code>&nbsp;，请你返回 <code>nums</code>&nbsp;中 <strong>好</strong>&nbsp;子数组的数目。</p>\n\n<p>一个子数组 <code>arr</code>&nbsp;如果有 <strong>至少</strong>&nbsp;<code>k</code>&nbsp;对下标 <code>(i, j)</code>&nbsp;满足 <code>i &lt; j</code>&nbsp;且 <code>arr[i] == arr[j]</code>&nbsp;，那么称它是一个 <strong>好</strong>&nbsp;子数组。</p>\n\n<p><strong>子数组</strong>&nbsp;是原数组中一段连续 <strong>非空</strong>&nbsp;的元素序列。</p>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre><b>输入：</b>nums = [1,1,1,1,1], k = 10\n<b>输出：</b>1\n<b>解释：</b>唯一的好子数组是这个数组本身。\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre><b>输入：</b>nums = [3,1,4,3,2,2,4], k = 2\n<b>输出：</b>4\n<b>解释：</b>总共有 4 个不同的好子数组：\n- [3,1,4,3,2,2] 有 2 对。\n- [3,1,4,3,2,2,4] 有 3 对。\n- [1,4,3,2,2,4] 有 2 对。\n- [4,3,2,2,4] 有 2 对。\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= nums.length &lt;= 10<sup>5</sup></code></li>\n\t<li><code>1 &lt;= nums[i], k &lt;= 10<sup>9</sup></code></li>\n</ul>\n",
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                "For a fixed index l, try to find the minimum value of index r, such that the subarray is not good",
                "When a number is added to a subarray, it increases the number of pairs by its previous appearances.",
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