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Practice · judged on hidden tests
Problems
2 problems, ordered so each topic builds on the last.
Any level
Easy
Medium
Hard
All topics
Binary search
Arrays
Graphs
Topological sort
Dynamic programming
Heaps
Design
Hash maps
Stacks and queues
Strings
Tries
Backtracking
Prefix sums
Hash sets
Sorting
Bit manipulation
Two pointers
Greedy
Sliding window
Trees
Linked lists
Matrices
Numbers
Basics
Not started
The number that appears once
Bit manipulation, Arrays, Hash maps
Easy
Not started
The one number that is not repeated three times
Bit manipulation, Arrays
Medium