Solution: Longest Harmonious Subsequence
C# solution for the Longest Harmonious Subsequence problem using the Hash Maps pattern.
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Statement
Given an integer array nums, return the length of the longest harmonious subsequence of nums.
A subsequence is formed by deleting zero or more elements from nums without changing the relative order of the remaining elements. A subsequence is called harmonious if the difference between its maximum value and minimum value is exactly
If no harmonious subsequence exists, return