LeetCode 1876: Easy Guide to Substrings of Size Three with Unique Characters in Python

🔠 LeetCode 1876: Substrings of Size Three with Distinct Characters – Python Tutorial
In this beginner-friendly tutorial, we break down LeetCode 1876 step by step using the sliding window technique. You’ll learn how to move a window across a string, check character uniqueness with a set, and count all valid substrings of length three.

📌 You’ll Learn:
✅ How sliding window works for substrings
✅ Using sets to check uniqueness
✅ Step-by-step Python explanation
✅ Time and space complexity
✅ Key takeaways for string problems

🎯 Perfect For:
Python beginners 🐍
String and substring problems learners 🔤
Coding interview prep 💻
Anyone struggling with sliding window 😅

🔗 Problem Link:
https://leetcode.com/problems/substrings-of-size-three-with-distinct-characters/

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