DSA
Master the patterns
Search the bank, then filter by difficulty, pattern, data structure, or algorithm. Each problem includes approaches, solutions, and walkthroughs.
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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
11 of 11 matching · 2723 totalSort: id ↑
No.ProblemDifficulty
- 0014Longest Common PrefixEasy
- 0021Merge Two Sorted ListsEasy
- 0083Remove Duplicates from Sorted ListEasy
- 0092Reverse Linked List IIMed
- 0107Binary Tree Level Order Traversal IIMed
- 0245Binary Tree PathsEasy
- 0255Missing NumberEasy
- 0266Perfect SquaresMed
- 0425Find All Anagrams in a StringMed
- 0513Random Pick with WeightMed
- 0550Permutation in StringMed
All 11 matching problems loaded