Given a list of integers, return a list containing only the values that appear more than once. Each duplicate value should appear exactly once in the result, sorted in ascending order. If no duplicates exist, return an empty list.
Examples:
Input: numbers = [1, 2, 3, 2, 4, 3, 5]
Output: [2, 3]
Explanation: Both 2 and 3 appear twice, so they are included in the result sorted in ascending order
Input: numbers = [1, 1, 1, 2, 2, 3]
Output: [1, 2]
Explanation: Both 1 and 2 appear more than once, result is sorted
Input: numbers = [1, 2, 3, 4, 5]
Output: []
Explanation: No duplicates exist, return empty list
Apex Code Editor
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 accountHow 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 Feb 2026
Contest runs February 1 - 28. Complete challenges to climb the leaderboard!
Points are calculated for challenges completed during the contest period.