- Executors
-
Learn
Python Learning Hub Runnable examples, NumPy, pandas, and more C & C++ Learning Hub Pointers, memory, STL, and modern C++ C# Learning HubC# basics, OOP, LINQ, async, and .NET exercises Python Algorithms Search, sorting, recursion, and visualizers O(n) C & C++ Algorithms Compare algorithms implemented in C and C++
- 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.
- Python · C++ · C#
- Automated tests
- AI code review
- Community solutions
- 150
- Challenges
- 2
- Solutions shared
- 3
- Languages
All challenges
Search by topic, language, or difficulty.
Medium
Exact Fraction Arithmetic
Perform fraction operations and return a reduced fraction.
No solutions yet
Hard
Largest Rectangle in a Histogram
Find the largest rectangle that fits under a histogram.
No solutions yet
Easy
Hours, Minutes, and Seconds
Convert a duration in seconds to a compact readable string.
No solutions yet
Medium
Smallest Missing Coin Sum
Find the first positive amount that cannot be made from the available coins.
No solutions yet
Medium
Largest Adjacent-Digit Product
Take every contiguous window of span digits and multiply its digits.
No solutions yet
Medium
Number Spiral Lookup
Find a value by row and column in an expanding number spiral.
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