Browse LeetCode problems frequently asked by Athenahealth. Filter by difficulty and timeframe to focus your interview prep.
Last updated: 20 Feb 2026
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30 days
3 months
6 months
More than 6 months
All
Easy
Medium
Hard
All
Problem
Difficulty
Frequency
Topics
The Number of Rich Customers
EASY
100%
Database
Best Time to Buy and Sell Stock
EASY
62.5%
ArrayDynamic Programming
First Missing Positive
HARD
62.5%
ArrayHash Table
Group Anagrams
MEDIUM
87.5%
ArrayHash TableStringSorting
Longest Substring Without Repeating Characters
MEDIUM
75%
Hash TableStringSliding Window
Exclusive Time of Functions
MEDIUM
62.5%
ArrayStack
Merge Intervals
MEDIUM
75%
ArraySorting
Longest Palindromic Substring
MEDIUM
62.5%
Two PointersStringDynamic Programming
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