Given an array of integers, the goal is to find the length of the longest harmonious subsequence where the difference between the maximum and minimum elements is 1.
An efficient approach involves counting the frequency of each number in the array and checking for pairs (num, num + 1) to calculate the length of the harmonious subsequence.
The provided C++, JavaScript, and Python code snippets demonstrate the implementation using hash maps and frequency analysis.
The harmonious subsequence problem is solved using a hash map for frequency tracking and examining adjacent number combinations, resulting in an efficient solution.