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- Challenges
Programming Challenges
Strengthen your problem-solving skills with language-neutral challenges you can solve in Python, C++, or C#. Every submission is checked by automated tests and reviewed by AI.
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Hard
Shortest Delivery Tour
Visit every city once and return home as cheaply as possible.
No solutions yet
Medium
Count Coin Combinations
Count ways to make an amount with unlimited coins of specified denominations.
No solutions yet
Medium
Count Grid Paths
Count routes across a rectangular grid using only right and down moves.
No solutions yet
Hard
Cut a Rectangle Into Squares
Find the fewest straight cuts needed to produce only squares.
No solutions yet
Hard
Maximum Project Rewards
Choose nonoverlapping projects to earn the largest total reward.
No solutions yet
Hard
Matrix Chain Multiplication
Find the cheapest order to multiply a chain of matrices.
No solutions yet
Medium
Subtract Digits to Reach Zero
Use as few digit subtractions as possible to reach zero.
No solutions yet
Hard
Minimum Elevator Rides
Group people into as few weight-limited elevator rides as possible.
No solutions yet
Hard
Count Numbers With Distinct Neighbors
Count range values whose adjacent decimal digits are never equal.
No solutions yet
Medium
Longest Common Subsequence Length
A subsequence is formed by deleting zero or more elements while preserving the order of the remaining elements.
No solutions yet