DSA
Master the patterns
Search the bank, then filter by difficulty, pattern, data structure, or algorithm. Each problem includes approaches, solutions, and walkthroughs.
Active·2,723
Easy·667
Medium·1,394
Hard·662
Patterns
Recognize the move
Filter the bank by pattern — each card links into the problem index.
Problem index
Browse problems
Search by title, then refine with facets. Sorted by problem ID.
Difficulty
Facets
20 of 21 matching · 2723 totalSort: id ↑
No.ProblemDifficulty
- 0001Two SumEasy
- 0003Longest Substring Without Repeating CharactersMed
- 0014Longest Common PrefixEasy
- 0026Remove Duplicates from Sorted ArrayEasy
- 0033Search in Rotated Sorted ArrayMed
- 0048Rotate ImageMed
- 0055Jump GameMed
- 0127Word LadderHard
- 0141Linked List CycleEasy
- 0146LRU CacheMed
- 0205Contains DuplicateEasy
- 0222Palindrome Linked ListEasy
- 0651Degree of an ArrayEasy
- 0899Minimum Increment to Make Array UniqueMed
- 0995Robot Bounded In CircleMed
- 1085Day of the YearEasy
- 1196Find the Smallest Divisor Given a ThresholdMed
- 2032Largest Number After Digit Swaps by ParityEasy
- 2612Maximum Strong Pair XOR IEasy
- 2615Maximum Strong Pair XOR IIHard
Showing 20 of 21