Browse LeetCode problems frequently asked by Epic Systems. 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
Letter Combinations of a Phone Number
MEDIUM
87.5%
Hash TableStringBacktracking
Valid Parentheses
EASY
87.5%
StringStack
Spiral Matrix
MEDIUM
87.5%
ArrayMatrixSimulation
Additive Number
MEDIUM
100%
StringBacktracking
Word Search
MEDIUM
62.5%
ArrayStringBacktrackingDepth-First SearchMatrix
Stepping Numbers
MEDIUM
87.5%
MathBacktrackingBreadth-First Search
Self Dividing Numbers
EASY
87.5%
Math
Angle Between Hands of a Clock
MEDIUM
62.5%
Math
Longest Substring Without Repeating Characters
MEDIUM
50%
Hash TableStringSliding Window
Bulls and Cows
MEDIUM
62.5%
Hash TableStringCounting
Two Sum
EASY
62.5%
ArrayHash Table
Palindromic Substrings
MEDIUM
50%
Two PointersStringDynamic Programming
Permutations
MEDIUM
50%
ArrayBacktracking
Longest Palindromic Substring
MEDIUM
50%
Two PointersStringDynamic Programming
Count Primes
MEDIUM
50%
ArrayMathEnumerationNumber Theory
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