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2:52
YouTube
CodeCraft
LeetCode 20: Valid Parentheses - Python Solution in 3 Minutes
We need to check if a string made up of brackets — (), {}, [] — is valid. A string is valid if: Every opening bracket has a matching closing bracket Brackets close in the correct order We can solve this easily using a stack: Push opening brackets onto the stack When a closing bracket appears, pop the last one and check if it matches If ...
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