LeetCode 20: Valid Parentheses – complete explanation in C++ using stack.
In this video, I explain how to solve the Valid Parentheses problem step by step using a stack in C++, focusing on interview thinking and edge cases.
You’ll learn:
- How stack helps in matching parentheses
- Step-by-step dry run with examples
- Common mistakes candidates make
- Complete C++ implementation
- Time and space complexity analysis
TimeStamps:
00:00 Introduction
00:46 Problem Explanation
02:59 Example Walkthrough
06:11 Stack Logic (Core Idea)
09:20 C++ Implementation
11:52 Code Execution & Output
Problem Link:
https://leetcode.com/problems/valid-parentheses/description/
Approach:
- Stack-based solution
Time Complexity: O(n)
Space Complexity: O(n)
This problem is commonly asked in coding interviews and is a must-know stack problem.
This video is useful for:
- LeetCode beginners
- Stack data structure problems
- DSA interview preparation
- C++ coding interviews
- FAANG interview preparation
Subscribe for clear explanations of LeetCode problems and interview-focused C++ solutions.
#leetcode #leetcode20 #validparentheses #stack #c++
