20. Valid Parentheses | LeetCode | Python

Published: 22 May 2024
on channel: Abdul Rahman

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Welcome back to our coding interview prep series! In today's video, we'll tackle the popular LeetCode problem "Valid Parentheses". This is a classic question often asked in coding interviews to test your understanding of data structures and your problem-solving skills. We'll break down the problem, discuss the approach, and implement the solution in Python.

🔍 Problem Description:

The "Valid Parentheses" problem asks us to determine if a given string of parentheses (which may include '()', '{}', and '[]') is valid. A string is considered valid if:

Open brackets are closed by the same type of brackets.
Open brackets are closed in the correct order.

🧩 Key Concepts Covered:

Stack Data Structure: We'll use a stack to keep track of the opening brackets and ensure they are closed in the correct order.
String Traversal: We'll iterate through the string to process each character.
Condition Checking: We'll check for matching pairs and ensure the stack is appropriately managed.

💻 Python Implementation:

We'll write a clean and efficient Python function to solve the problem. Here's a quick overview of the steps:

Initialize an empty stack.
Create a dictionary to map closing brackets to their corresponding opening brackets.
Iterate through the string:
If it's an opening bracket, push it onto the stack.
If it's a closing bracket, check if it matches the top of the stack.
After processing the string, check if the stack is empty.

📘 Chapters:

00:00 - Problem Statement
01:50 - Explaining Approach
05:50 - Writing Code
13:02 - Running & Submitting
13:35 - Conclusion

🏷️Tags:

#LeetCode #ValidParentheses #Python #CodingInterview #Programming #TechInterview #DataStructures #Algorithms #Coding

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