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g0501_0600.s0594_longest_harmonious_subsequence.readme.md Maven / Gradle / Ivy

594\. Longest Harmonious Subsequence

Easy

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

Given an integer array `nums`, return _the length of its longest harmonious subsequence among all its possible subsequences_.

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.

**Example 1:**

**Input:** nums = [1,3,2,2,5,2,3,7]

**Output:** 5

**Explanation:** The longest harmonious subsequence is [3,2,2,2,3]. 

**Example 2:**

**Input:** nums = [1,2,3,4]

**Output:** 2 

**Example 3:**

**Input:** nums = [1,1,1,1]

**Output:** 0 

**Constraints:**

*   1 <= nums.length <= 2 * 104
*   -109 <= nums[i] <= 109