Uppercase to lowercase… Using Just ONE Simple Trick | LeetCode 709
In this video, we solve the "To Lower Case" problem step by step and explore how uppercase characters can be converted into lowercase efficiently using ASCII logic.
We’ll cover:
• Problem understanding
• Basic approach using built-in functions
• ASCII character mapping
• Optimized lowercase conversion
• Clean and interview-ready code explanation
This problem is a great example of how understanding character encoding can simplify string manipulation problems.
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Additional Insight:
In ASCII, uppercase and lowercase letters have a fixed difference of 32. This allows us to directly convert characters without relying entirely on built-in functions, making the logic both simple and efficient.
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Source Code:
GitHub: https://github.com/PalDPathak404/leet...
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Problem Summary:
Given a string s, return the string after replacing every uppercase letter with the same lowercase letter.
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Key Takeaway:
Sometimes understanding the underlying representation of characters is more powerful than memorizing library functions.
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Connect with me:
LinkedIn: / paldpathak
GitHub: https://github.com/PalDPathak404
Twitter/X: https://x.com/PalDPathak
Instagram: / pal_pathak.911
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Topics Covered:
Strings, ASCII, Character Manipulation, Optimization, DSA
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Timestamps:
00:00 Introduction
00:42 Problem Explanation
01:02 Optimal Solution
03:40 Another way to solve
04:19 Outro
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