LeetCode Question #8:String to Integer(atoi)|java|

Publicado el: 28 junio 2026
en el canal de: Engineering Ah Therinjiko

LeetCode Question #8: String to Integer (atoi) | Java Solution Explained

In this video, we'll solve LeetCode Problem #8 – String to Integer (atoi) using Java with a clear, step-by-step explanation. This is one of the most frequently asked string parsing problems in coding interviews and helps you understand input processing, overflow handling, and edge cases.

📖 Problem Statement

Implement the myAtoi(String s) function that converts a string into a 32-bit signed integer.

The algorithm should:

Ignore leading whitespaces.
Determine the sign (+ or -).
Read digits until a non-digit character is encountered.
Ignore leading zeros.
Handle integer overflow by returning:
Integer.MAX_VALUE (2³¹ - 1) if overflow occurs.
Integer.MIN_VALUE (-2³¹) if underflow occurs.
📌 In this video, you'll learn:

✅ Understanding the atoi algorithm
✅ Handling leading whitespaces
✅ Processing positive & negative numbers
✅ Ignoring leading zeros
✅ Detecting invalid input
✅ Overflow & Underflow handling
✅ Java Implementation Explained
✅ Time & Space Complexity Analysis
✅ Interview Tips & Common Mistakes

📚 Examples Covered
"42" → 42
" -042" → -42
"1337c0d3" → 1337
"0-1" → 0
"words and 987" → 0
⏱ Complexity
Time Complexity: O(n)
Space Complexity: O(1)

This problem is commonly asked in interviews at top product-based companies like Amazon, Google, Microsoft, Adobe, Uber, Walmart, Oracle, and Flipkart.

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