Given a string containing only bracket characters '(', ')', '{', '}', '[', ']', determine if the input string has balanced brackets. An input string is valid if open brackets are closed by the same type in the correct order. Each closing bracket must match the most recent unmatched opening bracket.

Examples:

Input: brackets = '()[]{}' Output: true Explanation: All brackets are properly matched and in correct order Input: brackets = '([{}])' Output: true Explanation: Brackets are nested correctly with proper matching pairs Input: brackets = '(]' Output: false Explanation: Opening '(' does not match closing ']' Input: brackets = '([)]' Output: false Explanation: Brackets are not in correct order - ']' closes before ')' Input: brackets = null Output: false Explanation: Null input is considered invalid
Apex Code Editor
Sign in to Submit

Welcome to Lightning Challenge!

Create an Account

Sign up to track your progress, earn points, and compete with others. Your solutions will be saved automatically.

Create account

How It Works

  • • Write your solution in the code editor
  • • Connect your Salesforce org to test
  • • Submit to check if your solution passes
  • • Use hints if you get stuck

Contest Alert

🏆 #CodeEveryDay Mar 2026

Contest runs March 3 - 31. Complete challenges to climb the leaderboard!

Points are calculated for challenges completed during the contest period.