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 22 matching · 2723 totalSort: id ↑
No.ProblemDifficulty
- 0002Add Two NumbersMed
- 0003Longest Substring Without Repeating CharactersMed
- 0025Reverse Nodes in k-GroupHard
- 0121Best Time to Buy and Sell StockEasy
- 0175Largest NumberMed
- 0270Move ZeroesEasy
- 0389Remove K DigitsMed
- 0498Find Bottom Left Tree ValueMed
- 0623Trim a Binary Search TreeMed
- 0693Daily TemperaturesMed
- 0980Maximum Difference Between Node and AncestorMed
- 1099Remove Zero Sum Consecutive Nodes from Linked ListMed
- 1338Count Good Nodes in Binary TreeMed
- 1410Number of Good Leaf Nodes PairsMed
- 1874Find the Minimum and Maximum Number of Nodes Between Critical PointsMed
- 1940Maximum Twin Sum of a Linked ListMed
- 1944Minimum Swaps to Group All 1's Together IIMed
- 1986Merge Nodes in Between ZerosMed
- 2162Construct Smallest Number From DI StringMed
- 2199Reverse Odd Levels of Binary TreeMed
Showing 20 of 22