Epic Systems
16 problems
| Problem | Difficulty | Frequency ↓ | Topics |
|---|---|---|---|
| Additive Number | Medium | 100% | TopicsStringBacktracking |
| 54. Spiral Matrix | Medium | 90.6% | TopicsArrayMatrixSimulation |
| 20. Valid Parentheses | Easy | 84.4% | TopicsStringStackBracket Sequences |
| 17. Letter Combinations of a Phone Number | Medium | 80.4% | TopicsHash TableStringBacktracking |
| 1215. Stepping Numbers | Medium | 78.1% | TopicsMathBacktrackingBreadth-First Search |
| Self Dividing Numbers | Easy | 78.1% | TopicsMath |
| 1344. Angle Between Hands of a Clock | Medium | 64.3% | TopicsMath |
| 79. Word Search | Medium | 58.6% | TopicsArrayStringBacktrackingDepth-First SearchMatrix |
| 5. Longest Palindromic Substring | Medium | 58.6% | TopicsTwo PointersStringDynamic ProgrammingManacher |
| 204. Count Primes | Medium | 58.6% | TopicsArrayMathEnumerationNumber TheoryPrimality TestSieve TheoryPrime Number Sieve |
| 1. Two Sum | Easy | 50.5% | TopicsArrayHash Table |
| 647. Palindromic Substrings | Medium | 50.5% | TopicsTwo PointersStringDynamic Programming |
| 46. Permutations | Medium | 50.5% | TopicsArrayBacktracking |
| 329. Longest Increasing Path in a Matrix | Hard | 50.5% | TopicsArrayDynamic ProgrammingDepth-First SearchBreadth-First SearchGraph TheoryTopological SortMemoizationMatrixDirected Acyclic Graph |
| 125. Valid Palindrome | Easy | 50.5% | TopicsTwo PointersString |
| 299. Bulls and Cows | Medium | 50.5% | TopicsHash TableStringCounting |
