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Leetcode 20. Valid Parentheses

Check whether a string of parentheses/brackets is valid by ensuring every closing bracket matches the most recent unmatched opening bracket and the types and nesting order are correct. This is typically solved by tracking openings (e.g., with a stack) and verifying matching pairs.

Asked at:

Meta

Amazon

Google

Apple

Question Timeline

See when this question was last asked and where, including any notes left by other candidates.

Company

Level

Region

Mid October, 2025

Meta

Senior

Early October, 2025

M

Moloco

Staff

Early October, 2025

Meta

Manager

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