Leetcode 1415 | The k-th Lexicographical String of All Happy Strings of Length n

In this video, we solve Leetcode 1415 – The k-th Lexicographical String of All Happy Strings of Length n step by step.

A happy string is a string consisting only of characters ‘a’, ‘b’, and ‘c’ where no two adjacent characters are the same. The goal of this problem is to generate all such strings of length n, sort them in lexicographical order, and find the k-th string.

In this tutorial, I explain:

• The concept of Happy Strings
• How lexicographical ordering works
• The backtracking approach to generate valid strings
• Efficiently finding the k-th string
• Complete Java implementation with explanation

This explanation is beginner-friendly and perfect for coding interview preparation and DSA practice.

If you’re preparing for coding interviews, LeetCode, or improving your Data Structures & Algorithms, this problem is a great example of recursion and backtracking.

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Видео Leetcode 1415 | The k-th Lexicographical String of All Happy Strings of Length n канала ManiacCoder