String to Integer (atoi) - LeetCode 8 - Solution Explained & Java Code Walkthrough
Learn how to solve the classic "String to Integer (atoi)" coding interview problem efficiently! 🚀
In this video, we break down the logic required to parse a string into a 32-bit signed integer, handling all the tricky edge cases like leading whitespace, optional signs, garbage characters, and integer overflow. This is a must-know problem for anyone preparing for technical interviews at FAANG and other top tech companies.
We will cover:
1. ✅ Understanding the requirements (whitespace, signs, digits).
2. 🛑 How to handle non-digit characters stopping the parsing.
3. ⚠️ The math behind detecting 32-bit integer overflow/underflow before it happens.
4. 💻 A complete step-by-step code walkthrough in Java.
5. ⏱️ Time and Space complexity analysis.
Whether you are a beginner or looking to refresh your parsing logic, this guide has you covered. Mastering input validation and edge-case handling is crucial for software engineering roles.
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#leetcode #programming #java #codinginterview #algorithms #softwareengineering #atoi #stringmanipulation #tutorial
Chapters:
00:00 - String to Integer (atoi)
00:14 - What is atoi?
00:33 - The Challenge: Varied Inputs
00:56 - Rules: Whitespace & Signs
01:19 - Rule 3: Conversion & Stopping
01:39 - Edge Case: 32-bit Integer Overflow
02:00 - Algorithm Flow
02:21 - Code Walkthrough: Setup
02:38 - Code Walkthrough: Signs
02:55 - Code Walkthrough: Digits & Overflow
03:22 - Complexity Analysis
03:41 - Key Takeaways
04:01 - Outro
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