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Valid Parentheses - LeetCode 20 - Python - Visually Explained
LeetCode 20 — Valid Parentheses. Given a string containing only brackets, determine if it's valid. The key is a stack: push opening brackets, and for each closing bracket check if the top of the stack is the matching opener — if yes, pop it; if not, return false. After scanning the full string, return true only if the stack is empty. Time ...
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