🔥 LeetCode Hard: Integer to English Words (
🔢 LeetCode Hard - Integer to English Words (#273) 🔢
In this video, I tackle the LeetCode Hard problem "Integer to English Words" (LeetCode #273). This problem is frequently asked in FAANG interviews, and I break it down step by step so you can understand the logic behind it.
🚀 Problem Statement:
Given an integer num, convert it to its English words representation.
🔗 LeetCode Problem: https://leetcode.com/problems/integer...
🔗 Code on GitHub: https://github.com/jsherbert95/LeetCo...
🧠 Code Walkthrough & Approach
We break down the number into groups of three digits (thousands grouping) and convert them into English words while keeping track of their magnitude (Thousand, Million, Billion).
1️⃣ Edge Case Handling:
If num == 0, return "Zero".
2️⃣ Mapping Numbers to Words:
ones[] array handles numbers 1-19.
tens[] array handles multiples of ten (20, 30, ... 90).
thousands[] array provides scale suffixes (Thousand, Million, Billion).
3️⃣ Processing in Chunks of Three Digits:
Extract the last three digits using num % 1000.
-Convert this chunk into English words:
Extract hundreds (x Hundred).
Extract tens (twenty, thirty, etc.).
Extract ones (one, two, ..., nineteen).
Append the appropriate scale (Thousand, Million, Billion).
-Insert this group at the beginning of the result string.
-Repeat the process until num == 0.
4️⃣ Final Formatting:
Trim extra spaces and return the correctly formatted English phrase.
💡 Time Complexity & Space Complexity:
✅ Time Complexity: O(log n) (Processing num in groups of three digits).
✅ Space Complexity: O(1) (Uses fixed arrays and StringBuilder).
📚 Topics Covered in This Video:
✅ String Manipulation
✅ Number Parsing
✅ Algorithm Design
✅ Edge Cases Handling
✅ Space & Time Complexity Optimization
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Happy coding! 🚀