length-of-longest-subarray-with-at-most-k-frequency

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Algorithms

You are given an integer array <code>nums</code> and an integer <code>k</code>.

The frequency of an element <code>x</code> is the number of times it occurs in an array.

An array is called good if the frequency of each element in this array is less than or equal to <code>k</code>.

Return the length of the longest good subarray of <code>nums</code>.

A subarray is a contiguous non-empty sequence of elements within an array.

&nbsp;
Example 1:

<pre>
Input: nums = [1,2,3,1,2,3,1,2], k = 2
Output: 6
Explanation: 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.
It can be shown that there are no good subarrays with length more than 6.
</pre>

Example 2:

<pre>
Input: nums = [1,2,1,2,1,2,1,2], k = 1
Output: 2
Explanation: 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.
It can be shown that there are no good subarrays with length more than 2.
</pre>

Example 3:

<pre>
Input: nums = [5,5,5,5,5,5,5], k = 4
Output: 4
Explanation: The longest possible good subarray is [5,5,5,5] since the value 5 occurs 4 times in this subarray.
It can be shown that there are no good subarrays with length more than 4.
</pre>

&nbsp;
Constraints:

<ul>
	<li><code>1 &lt;= nums.length &lt;= 105</code></li>
	<li><code>1 &lt;= nums[i] &lt;= 109</code></li>
	<li><code>1 &lt;= k &lt;= nums.length</code></li>
</ul>

maxSubarrayLength

Length of Longest Subarray With at Most K Frequency

Longest Substring with At Least K Repeating Characters

longest-substring-with-at-least-k-repeating-characters

至少有 K 个重复字符的最长子串

Array

Hash Table

Sliding Window

给你一个整数数组&nbsp;<code>nums</code>&nbsp;和一个整数&nbsp;<code>k</code>&nbsp;。

一个元素 <code>x</code>&nbsp;在数组中的 频率&nbsp;指的是它在数组中的出现次数。

如果一个数组中所有元素的频率都 小于等于&nbsp;<code>k</code>&nbsp;，那么我们称这个数组是 好&nbsp;数组。

请你返回 <code>nums</code>&nbsp;中 最长好&nbsp;子数组的长度。

子数组 指的是一个数组中一段连续非空的元素序列。

&nbsp;

示例 1：

<pre>
输入：nums = [1,2,3,1,2,3,1,2], k = 2
输出：6
解释：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。
最长好子数组的长度为 6 。
</pre>

示例 2：

<pre>
输入：nums = [1,2,1,2,1,2,1,2], k = 1
输出：2
解释：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。
最长好子数组的长度为 2 。
</pre>

示例 3：

<pre>
输入：nums = [5,5,5,5,5,5,5], k = 4
输出：4
解释：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 。
最长好子数组的长度为 4 。
</pre>

&nbsp;

提示：

<ul>
	<li><code>1 &lt;= nums.length &lt;= 105</code></li>
	<li><code>1 &lt;= nums[i] &lt;= 109</code></li>
	<li><code>1 &lt;= k &lt;= nums.length</code></li>
</ul>