leetcode-problemset/leetcode-cn/originData/length-of-longest-subarray-with-at-most-k-frequency.json

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            "title": "Length of Longest Subarray With at Most K Frequency",
            "titleSlug": "length-of-longest-subarray-with-at-most-k-frequency",
            "content": "<p>You are given an integer array <code>nums</code> and an integer <code>k</code>.</p>\n\n<p>The <strong>frequency</strong> of an element <code>x</code> is the number of times it occurs in an array.</p>\n\n<p>An array is called <strong>good</strong> if the frequency of each element in this array is <strong>less than or equal</strong> to <code>k</code>.</p>\n\n<p>Return <em>the length of the <strong>longest</strong> <strong>good</strong> subarray of</em> <code>nums</code><em>.</em></p>\n\n<p>A <strong>subarray</strong> is a contiguous non-empty 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 = [1,2,3,1,2,3,1,2], k = 2\n<strong>Output:</strong> 6\n<strong>Explanation:</strong> The longest possible good subarray is [1,2,3,1,2,3] since the values 1, 2, and 3 occur at most twice in this subarray. Note that the subarrays [2,3,1,2,3,1] and [3,1,2,3,1,2] are also good.\nIt can be shown that there are no good subarrays with length more than 6.\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> nums = [1,2,1,2,1,2,1,2], k = 1\n<strong>Output:</strong> 2\n<strong>Explanation:</strong> The longest possible good subarray is [1,2] since the values 1 and 2 occur at most once in this subarray. Note that the subarray [2,1] is also good.\nIt can be shown that there are no good subarrays with length more than 2.\n</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> nums = [5,5,5,5,5,5,5], k = 4\n<strong>Output:</strong> 4\n<strong>Explanation:</strong> The longest possible good subarray is [5,5,5,5] since the value 5 occurs 4 times in this subarray.\nIt can be shown that there are no good subarrays with length more than 4.\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] &lt;= 10<sup>9</sup></code></li>\n\t<li><code>1 &lt;= k &lt;= nums.length</code></li>\n</ul>\n",
            "translatedTitle": "最多 K 个重复元素的最长子数组",
            "translatedContent": "<p>给你一个整数数组&nbsp;<code>nums</code>&nbsp;和一个整数&nbsp;<code>k</code>&nbsp;。</p>\n\n<p>一个元素 <code>x</code>&nbsp;在数组中的 <strong>频率</strong>&nbsp;指的是它在数组中的出现次数。</p>\n\n<p>如果一个数组中所有元素的频率都 <strong>小于等于&nbsp;</strong><code>k</code>&nbsp;，那么我们称这个数组是 <strong>好</strong>&nbsp;数组。</p>\n\n<p>请你返回 <code>nums</code>&nbsp;中 <strong>最长好</strong>&nbsp;子数组的长度。</p>\n\n<p><strong>子数组</strong> 指的是一个数组中一段连续非空的元素序列。</p>\n\n<p>&nbsp;</p>\n\n<p><strong class=\"example\">示例 1：</strong></p>\n\n<pre>\n<b>输入：</b>nums = [1,2,3,1,2,3,1,2], k = 2\n<b>输出：</b>6\n<strong>解释：</strong>最长好子数组是 [1,2,3,1,2,3] ，值 1 ，2 和 3 在子数组中的频率都没有超过 k = 2 。[2,3,1,2,3,1] 和 [3,1,2,3,1,2] 也是好子数组。\n最长好子数组的长度为 6 。\n</pre>\n\n<p><strong class=\"example\">示例 2：</strong></p>\n\n<pre>\n<strong>输入：</strong>nums = [1,2,1,2,1,2,1,2], k = 1\n<b>输出：</b>2\n<b>解释：</b>最长好子数组是 [1,2] ，值 1 和 2 在子数组中的频率都没有超过 k = 1 。[2,1] 也是好子数组。\n最长好子数组的长度为 2 。\n</pre>\n\n<p><strong class=\"example\">示例 3：</strong></p>\n\n<pre>\n<b>输入：</b>nums = [5,5,5,5,5,5,5], k = 4\n<b>输出：</b>4\n<b>解释：</b>最长好子数组是 [5,5,5,5] ，值 5 在子数组中的频率没有超过 k = 4 。\n最长好子数组的长度为 4 。\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] &lt;= 10<sup>9</sup></code></li>\n\t<li><code>1 &lt;= k &lt;= nums.length</code></li>\n</ul>\n",
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                "For each index <code>i</code>, find the rightmost index <code>j >= i</code> such that the frequency of each element in the subarray <code>[i, j]</code> is at most <code>k</code>.",
                "We can use 2 pointers / sliding window to achieve it."
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