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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
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
Easy
Armstrong Number
Check whether a number equals the sum of its digits raised to the digit count.
No solutions yet
Hard
Minimum Elevator Rides
Group people into as few weight-limited elevator rides as possible.
No solutions yet
Easy
Make an Array Nondecreasing
Find the fewest increments needed so each value is at least the previous one.
No solutions yet
Medium
Largest Adjacent-Digit Product
Take every contiguous window of span digits and multiply its digits.
No solutions yet
Hard
Count Numbers With Distinct Neighbors
Count range values whose adjacent decimal digits are never equal.
No solutions yet
Easy
Sum Even Fibonacci Terms
Add the even Fibonacci terms that do not exceed a limit.
No solutions yet
Easy
Acronym Generator
Create an acronym from the first letter of every word, in uppercase.
No solutions yet
Easy
Hamming Distance
Compare two DNA strings position by position and count the differences.
No solutions yet