{ "data": { "question": { "questionId": "594", "questionFrontendId": "594", "categoryTitle": "Algorithms", "boundTopicId": 1772, "title": "Longest Harmonious Subsequence", "titleSlug": "longest-harmonious-subsequence", "content": "

We define a harmonious array as an array where the difference between its maximum value and its minimum value is exactly 1.

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Given an integer array nums, return the length of its longest harmonious subsequence among all its possible subsequences.

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A subsequence of array is a sequence that can be derived from the array by deleting some or no elements without changing the order of the remaining elements.

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Example 1:

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\r\nInput: nums = [1,3,2,2,5,2,3,7]\r\nOutput: 5\r\nExplanation: The longest harmonious subsequence is [3,2,2,2,3].\r\n
\r\n\r\n

Example 2:

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\r\nInput: nums = [1,2,3,4]\r\nOutput: 2\r\n
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Example 3:

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\r\nInput: nums = [1,1,1,1]\r\nOutput: 0\r\n
\r\n\r\n

 

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Constraints:

\r\n\r\n", "translatedTitle": "最长和谐子序列", "translatedContent": "

和谐数组是指一个数组里元素的最大值和最小值之间的差别 正好是 1 。

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现在，给你一个整数数组 nums ，请你在所有可能的子序列中找到最长的和谐子序列的长度。

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数组的子序列是一个由数组派生出来的序列，它可以通过删除一些元素或不删除元素、且不改变其余元素的顺序而得到。

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示例 1：

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\n输入：nums = [1,3,2,2,5,2,3,7]\n输出：5\n解释：最长的和谐子序列是 [3,2,2,2,3]\n
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示例 2：

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\n输入：nums = [1,2,3,4]\n输出：2\n
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示例 3：

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\n输入：nums = [1,1,1,1]\n输出：0\n
\n\n

 

\n\n

提示：

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