Web Reference: Jul 12, 2025 · 21. Valid Parentheses - Neetcode 150 - YouTube About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday... In a valid parenthesis expression, every opening bracket must have a corresponding closing bracket. The stack is used to process the valid string, and it should be empty after the entire process. Oct 27, 2025 · Problem Given a string s containing just the characters ' (', ')', ' {', '}', ' [' and ']', determine if the input string is valid. An input string is valid if:
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