Stacks And Queues

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* Problem Link and Solution in Video Description

Valid Parentheses

https://www.youtube.com/watch?v=01hoOxLzMv8

Easy | ** | actually simple but need to handle all kinds of parentheses with bunch of conditionals

Min Stack

https://www.youtube.com/watch?v=e9SPZqYmUdc&t=1s

Medium | ** | Easy Straightforward trick

Valid Parentheses String

https://www.youtube.com/watch?v=dCqLl7cXkV0

Medium | *** | Much easier without * (just a * problem !)