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NEValid Parentheses 🔥 The Stack Trick Every Coding Interview Uses
This is one of the most asked coding interview questions.
Given a string containing (), {}, [], you must determine if the parentheses are valid and correctly ordered.
The trick interviewers expect is using a Stack.
✔ Push opening brackets
✔ When you see a closing bracket, check the top of the stack
✔ If it matches → pop it
✔ If not → invalid
If the stack is empty at the end → the string is valid.
⏱ Time Complexity: O(n)
📦 Space Complexity: O(n)
This problem teaches a fundamental stack pattern used in many coding interviews.
📌 Save this reel for your DSA preparation
💬 Comment “STACK” if you want more stack interview problems.
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#datastructures
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![#Valid Parentheses Reel by @the_david_jiang (verified account) - LeetCode 20. Valid Parentheses
Given a string s containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is vali](https://image.pictame.com/img/503092724_9007022239400402_3636583292213707674_n.jpg?hash=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)
