Problem database last updated: June 20, 2025
11 problems · 3 Easy, 8 Medium, 0 Hard · Ranked #132 of 458
3 Easy
27% · avg 23%
8 Medium
73% · avg 59%
0 Hard
0% · avg 18%
Based on 11 reported problems, Epic Systems interviews are easier than average - only 0% Hard compared to 18% across all companies. The majority (73%) 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, Epic Systems puts unusual emphasis on backtracking (27.3% of problems, 5.2x the industry average), string (63.6% of problems, 2.3x the industry average), matrix (18.2% of problems, 2.1x the industry average). If you're short on time, these are the categories to double down on.
The most common topics are string (63.6%), backtracking (27.3%), hash-table (27.3%), array (27.3%). Problems below are sorted by frequency, the ones at the top are asked most often.
| Problem | Difficulty | Frequency | Topics | |
|---|---|---|---|---|
Additive Number An additive number is a string whose digits can form an additive sequence. | Medium | Very Likely | stringbacktracking | Solve |
Letter Combinations of a Phone Number Given a string containing digits from 2-9 inclusive, return all possible letter combinations that the number could represent. Return the answer in any order. | Medium | Very Likely | hash-tablestringbacktracking | Solve |
Self Dividing Numbers A self-dividing number is a number that is divisible by every digit it contains. | Easy | Very Likely | math | Solve |
Spiral Matrix Given an m x n matrix, return all elements of the matrix in spiral order. | Medium | Very Likely | arraymatrixsimulation | Solve |
Valid Parentheses Given a string s containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. | Easy | Very Likely | stringstack | Solve |
Word Search Given an m x n grid of characters board and a string word, return true if word exists in the grid. | Medium | Likely | arraystringbacktracking | Solve |
Angle Between Hands of a Clock Given two numbers, hour and minutes, return the smaller angle (in degrees) formed between the hour and the minute hand. | Medium | Likely | math | 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 |
Bulls and Cows You are playing the Bulls and Cows game with your friend. | Medium | Likely | hash-tablestringcounting | Solve |
Palindromic Substrings Given a string s, return the number of palindromic substrings in it. | Medium | Likely | two-pointersstringdynamic-programming | 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 |
Additive Number
SolveAn additive number is a string whose digits can form an additive sequence.
Letter Combinations of a Phone Number
SolveGiven a string containing digits from 2-9 inclusive, return all possible letter combinations that the number could represent. Return the answer in any order.
Self Dividing Numbers
SolveA self-dividing number is a number that is divisible by every digit it contains.
Spiral Matrix
SolveGiven an m x n matrix, return all elements of the matrix in spiral order.
Valid Parentheses
SolveGiven a string s containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid.
Word Search
SolveGiven an m x n grid of characters board and a string word, return true if word exists in the grid.
Angle Between Hands of a Clock
SolveGiven two numbers, hour and minutes, return the smaller angle (in degrees) formed between the hour and the minute hand.
Two Sum
SolveGiven an array of integers nums and an integer target, return the indices of the two numbers that add up to target.
Bulls and Cows
SolveYou are playing the Bulls and Cows game with your friend.
Palindromic Substrings
SolveGiven a string s, return the number of palindromic substrings in it.
Longest Substring Without Repeating Characters
SolveGiven a string s, find the length of the longest substring without duplicate characters.
Frequency scores are based on crowdsourced interview reports. A higher score means the problem has been reported more often in recent Epic Systems interviews.
Very Likely
75-100%
Likely
50-74%
Sometimes
25-49%
Rare
0-24%
Epic Systems interviews focus heavily on string, backtracking, hash-table 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. Epic Systems 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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Epic Systems has been reported to ask 11 distinct coding problems. The most common topics are string, backtracking, hash-table. 3 are Easy difficulty, 8 are Medium, and 0 are Hard. Problems are sorted by frequency - the ones at the top are asked most often.
Based on 11 reported problems, Epic Systems interviews are easier than average - only 0% Hard compared to 18% across all companies. 73% 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: string, backtracking, hash-table. Practice solving them under time pressure and explaining your approach out loud. Mock interviews with AI can simulate the real experience.
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