🔥 LeetCode 08: String to Integer (atoi) in Python | Day 08 🚀

Published: 20 August 2026
on channel: Black Dot Origin

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🚀 𝗗𝗔𝗬 𝟬𝟴: 𝗟𝗲𝗲𝘁𝗖𝗼𝗱𝗲 𝟬𝟴 - 𝗦𝘁𝗿𝗶𝗻𝗴 𝘁𝗼 𝗜𝗻𝘁𝗲𝗴𝗲𝗿 (𝗮𝘁𝗼𝗶) | 𝗙𝗔𝗔𝗡𝗚 𝗣𝗹𝗮𝗰𝗲𝗺𝗲𝗻𝘁 𝗦𝗲𝗿𝗶𝗲𝘀

Welcome to Day 08 of our Complete Data Structures & Algorithms (DSA) Roadmap! 💡

In this episode, we tackle LeetCode 08: String to Integer (atoi), an essential Medium-level string parsing problem frequently asked in technical interviews at top tech giants like Amazon, Microsoft, Meta, and Bloomberg.

We break down the raw state machine intuition step-by-step, manage tricky edge cases like leading whitespaces, optional signs, non-digit characters, and clamp the result strictly within the 32-bit signed integer range $[-2^{31}, 2^{31} - 1]$ using clean Python code. 🐍

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📌 𝗪𝗛𝗔𝗧 𝗬𝗢𝗨'𝗟𝗟 𝗟𝗘𝗔𝗥𝗡 𝗜𝗡 𝗧𝗛𝗜𝗦 𝗩𝗜𝗗𝗘𝗢:
• Problem Breakdown: Step-by-step state parsing logic and handling sequential character rules
• Whitespace & Sign Handling: Skipping leading spaces and detecting explicit positive/negative signs
• Digit Conversion & Clamping: Building the integer value iteratively while handling 32-bit overflow limits
• Non-Digit Break Conditions: Stopping parsing instantly when encountering invalid characters
• Clean Python Implementation: Step-by-step coding walkthrough and edge-case dry run

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💻 𝗖𝗢𝗗𝗘 & 𝗥𝗘𝗦𝗢𝗨𝗥𝗖𝗘𝗦:
🔗 Problem Link: [https://leetcode.com/problems/string-...]
📁 Source Code: [https://github.com/blackdotorigin/FAA...]
▶️ Complete DSA Playlist: [ • FAANG DSA ]

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💬 𝗝𝗢𝗜𝗡 𝗧𝗛𝗘 𝗖𝗢𝗠𝗠𝗨𝗡𝗜𝗧𝗬:
If this video helped you master string parsing and overflow handling, hit Like, Subscribe, and turn on the Notification Bell 🔔 so you don't miss Day 09!

Have questions or an alternate approach? Drop them in the comments below—I reply to every single comment! 👇

#DSA #LeetCode #Python #ATOI #StringToInteger #Strings #FAANG #CodingInterview #SoftwareEngineering #DataStructures

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