Problem database last updated: June 20, 2025
10 problems · 3 Easy, 6 Medium, 1 Hard · Ranked #141 of 458
3 Easy
30% · avg 23%
6 Medium
60% · avg 59%
1 Hard
10% · avg 18%
Based on 10 reported problems, athenahealth interviews are in line with industry averages - 10% Hard vs 18% overall. The majority (60%) of questions are Medium difficulty, which is typical for companies that want to see solid fundamentals without excessive trick questions.
Compared to the industry average, athenahealth puts unusual emphasis on sorting (30% of problems, 2.1x the industry average), dynamic-programming (30% of problems, 1.5x the industry average), two-pointers (20% of problems, 1.5x the industry average). If you're short on time, these are the categories to double down on.
The most common topics are array (80%), hash-table (30%), string (30%), sorting (30%). Problems below are sorted by frequency, the ones at the top are asked most often.
| Problem | Difficulty | Frequency | Topics | |
|---|---|---|---|---|
Group Anagrams Given an array of strings strs, group the anagrams together. You can return the answer in any order. | Medium | Very Likely | arrayhash-tablestring | Solve |
Merge Intervals Given an array of intervals where intervals[i] = [starti, endi], merge all overlapping intervals, and return an array of the non-overlapping intervals that cove... | Medium | Likely | arraysorting | Solve |
Best Time to Buy and Sell Stock You are given an array prices where prices[i] is the price of a given stock on the ith day. | Easy | Likely | arraydynamic-programming | Solve |
Merge Sorted Array You are given two integer arrays nums1 and nums2, sorted in non-decreasing order, and two integers m and n, representing the number of elements in nums1 and num... | Easy | Likely | arraytwo-pointerssorting | Solve |
First Missing Positive Given an unsorted integer array nums. Return the smallest positive integer that is not present in nums. | Hard | Likely | arrayhash-table | Solve |
Unique Paths II You are given an m x n integer array grid. There is a robot initially located at the top-left corner (i.e., grid[0][0]). The robot tries to move to the bottom-r... | Medium | Likely | arraydynamic-programmingmatrix | Solve |
Two Sum Given an array of integers nums and an integer target, return the indices of the two numbers that add up to target. | Easy | Likely | arrayhash-map | Solve |
Exclusive Time of Functions On a single-threaded CPU, we execute a program containing n functions. Each function has a unique ID between 0 and n-1. | Medium | Likely | arraystack | Solve |
Longest Substring Without Repeating Characters Given a string s, find the length of the longest substring without duplicate characters. | Medium | Likely | hash-tablestringsliding-window | Solve |
Longest Palindromic Substring Given a string s, return the longest palindromic substring in s. | Medium | Likely | two-pointersstringdynamic-programming | Solve |
Group Anagrams
SolveGiven an array of strings strs, group the anagrams together. You can return the answer in any order.
Merge Intervals
SolveGiven an array of intervals where intervals[i] = [starti, endi], merge all overlapping intervals, and return an array of the non-overlapping intervals that cove...
Best Time to Buy and Sell Stock
SolveYou are given an array prices where prices[i] is the price of a given stock on the ith day.
Merge Sorted Array
SolveYou are given two integer arrays nums1 and nums2, sorted in non-decreasing order, and two integers m and n, representing the number of elements in nums1 and num...
First Missing Positive
SolveGiven an unsorted integer array nums. Return the smallest positive integer that is not present in nums.
Unique Paths II
SolveYou are given an m x n integer array grid. There is a robot initially located at the top-left corner (i.e., grid[0][0]). The robot tries to move to the bottom-r...
Two Sum
SolveGiven an array of integers nums and an integer target, return the indices of the two numbers that add up to target.
Exclusive Time of Functions
SolveOn a single-threaded CPU, we execute a program containing n functions. Each function has a unique ID between 0 and n-1.
Longest Substring Without Repeating Characters
SolveGiven a string s, find the length of the longest substring without duplicate characters.
Longest Palindromic Substring
SolveGiven a string s, return the longest palindromic substring in s.
Frequency scores are based on crowdsourced interview reports. A higher score means the problem has been reported more often in recent athenahealth interviews.
Very Likely
75-100%
Likely
50-74%
Sometimes
25-49%
Rare
0-24%
athenahealth interviews focus heavily on array, hash-table, string problems. If you're short on time, these are the categories to prioritize. The problems on this page are sorted by frequency, so start from the top and work your way down.
Beyond solving problems, practice explaining your approach. athenahealth interviewers care about your thought process - how you break down a problem, consider edge cases, and evaluate tradeoffs between solutions. A clean O(n) solution you can explain clearly beats an O(log n) solution you can't articulate.
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athenahealth has been reported to ask 10 distinct coding problems. The most common topics are array, hash-table, string. 3 are Easy difficulty, 6 are Medium, and 1 are Hard. Problems are sorted by frequency - the ones at the top are asked most often.
Based on 10 reported problems, athenahealth interviews are in line with industry averages - 10% Hard vs 18% overall. 60% of questions are Medium difficulty. Focus on the high-frequency Medium problems first, then work through the Hard ones.
Start with the highest-frequency problems listed on this page. Focus on the core topics: array, hash-table, string. Practice solving them under time pressure and explaining your approach out loud. Mock interviews with AI can simulate the real experience.
Simulate a real athenahealth coding interview with an AI interviewer. Get a scorecard with specific feedback on your problem-solving, code quality, and communication.
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