Coding rounds

Amazon coding rounds

5 timed coding challenges drawn from real loops. Submit a solution to see your test pass rate and AI feedback.

beginner 30:00+50 XP

Valid Parentheses

Given a string `s` containing only the characters `()[]{}`, determine if the input string is valid. Brackets must close in the correct order and every opening bracket has a matching closing bracket of the same type. Use a stack.

Examples

all matched
in: s="()[]{}"
out: true
mismatched types
in: s="(]"
out: false

javascript

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