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 20 matching · 2723 totalSort: id ↑
No.ProblemDifficulty
- 0031Next PermutationMed
- 0033Search in Rotated Sorted ArrayMed
- 0050Pow(x, n)Med
- 0072Edit DistanceMed
- 0075Sort ColorsMed
- 0124Binary Tree Maximum Path SumHard
- 0130Surrounded RegionsMed
- 0152Maximum Product SubarrayMed
- 0178Best Time to Buy and Sell Stock IVHard
- 0186House RobberMed
- 0840Possible BipartitionMed
- 1221Minimum Insertion Steps to Make a String PalindromeHard
- 1442Maximum Length of Subarray With Positive ProductMed
- 1546Stone Game VIMed
- 1843Maximize the Confusion of an ExamMed
- 1853Partition Array Into Two Arrays to Minimize Sum DifferenceHard
- 2014Count Collisions on a RoadMed
- 2120Number of People Aware of a SecretMed
- 2289Cycle Length Queries in a TreeHard
- 2886Find the Count of Monotonic Pairs IHard
All 20 matching problems loaded