Simplify Path | Stack-Based Path Normalization | JavaScript | LeetCode 71

📝 Description:
🔥 Day 95 of my LeetCode Daily Challenge! In this problem, I solve LeetCode 71 - Simplify Path using a stack-based approach in JavaScript.

This is a classic string + stack problem where we are given a Unix-style file path and need to simplify it to its canonical form.

🧠 Key Idea:
We simulate directory navigation using a stack:

. → current directory → ignore
.. → go to parent directory → pop from stack
valid directory name → push to stack

⚡ Approach:
Split the path using '/'
Traverse each part:
Ignore empty strings and .
If .. → pop from stack (if not empty)
Otherwise → push directory name
Build the result from stack

🚀 Why this works:
The stack naturally represents the directory structure:

Push → move forward
Pop → move backward

This makes path normalization clean and efficient.

✅ Complexity:
Time Complexity: O(n)
Space Complexity: O(n)

📚 In this video, you will learn:
How to simplify Unix file paths
How to use stack for path traversal
How to handle edge cases like .., ., and //
Why stack is perfect for undo operations
Common string + stack patterns

🔗 Problem Link:
https://leetcode.com/problems/simplify-path/

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Видео Simplify Path | Stack-Based Path Normalization | JavaScript | LeetCode 71 канала Ashwini Kemshetty