Longest Balanced Subarray II โ€” Algorithm Visualization & Coding Challenge

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Understanding Longest Balanced Subarray II
Detailed explanation and reference materials
Problem Overview

๐ŸŸฃ Longest Balanced Subarray II

Difficulty: Hard


๐Ÿง  Problem Statement

You are given an integer array nums.

A subarray is called balanced if:

Number of distinct even elements

Number of distinct odd elements

๐Ÿ” Your task is to return the length of the longest balanced subarray.


๐Ÿงช Examples

Example 1

Input

[2, 5, 4, 3]

Explanation

  • Distinct evens โ†’ [2, 4]
  • Distinct odds โ†’ [5, 3]
  • Counts are equal โ†’ โœ… balanced

Output

4

Example 2

Input

[3, 2, 2, 5, 4]

Explanation

  • Distinct evens โ†’ [2, 4]
  • Distinct odds โ†’ [3, 5]
  • Balanced subarray = whole array

Output

5

Example 3

Input

[1, 2, 3, 2]

Explanation

  • Best balanced subarray โ†’ [2, 3, 2]
  • Distinct even = 1, distinct odd = 1

Output

3

Happy coding! ๐Ÿ˜Š

โ€” Written by Saurabh Patil โ€ข B.Tech CSE โ€ข Software Developer

Categories
segment-trees
leetcode-problem-of-the-day
Lazy Propagation
HashMap
java
Reference Link
https://leetcode.com/problems/longest-balanced-subarray-ii/

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