</>
CodexBash
Problems
Learn
Tutorials
Blog
Pricing
Sign in
Get started
Practice · judged on hidden tests
Problems
4 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
Median from a data stream
Heaps, Design
Hard
Not started
Merging many sorted lists at once
Heaps, Arrays, Sorting
Hard
Not started
Most frequent numbers
Heaps, Arrays, Sorting
Medium
Not started
The kth largest, without sorting everything
Heaps, Arrays
Medium