Decode String - LeetCode 394 - Stack and Recursion Explained
Learn how to solve the 'Decode String' problem (LeetCode 394) using both Stack and Recursion! 🚀
This is a classic coding interview question that tests your ability to handle nested structures. In this video, we break down the logic step-by-step, showing you exactly how to expand encoded strings like '3[a]2[bc]' into their full form.
What you will learn:
🔹 How to identify nested sub-problems
🔹 Step-by-step visualization of the Stack approach
🔹 How to implement a clean Recursive DFS solution
🔹 Time and Space complexity analysis
Whether you are preparing for technical interviews or just sharpening your algorithm skills, this guide is for you! 💻✨
#coding #leetcode #algorithm #python #java #programming #interviewprep #computerscience #stack #recursion
Chapters:
00:00 - Decode String
00:14 - The Challenge
00:36 - Basic Examples
00:59 - Why is this tricky?
01:19 - Approach 1: Using a Stack
01:37 - Step 1: Building the Stack
01:56 - Step 2: Hit ']' and Pop
02:19 - Approach 2: Recursion
02:38 - Pseudocode Logic
03:01 - Complexity Analysis
03:21 - Summary
03:42 - Outro
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