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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
Learning path
150
Challenges
2
Solutions shared
3
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All challenges

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84 challenges
Easy

Fibonacci Number

Return the n-th Fibonacci number.

BeginnerLoopsSequencesStudent-beginner
Python C++ C#
0 solved
No solutions yet
Medium

Tic-Tac-Toe Winner

Decide the result of a tic-tac-toe board.

BeginnerConditionsGridsLearning-path
Python C++ C#
0 solved
No solutions yet
Easy

Simple Interest

Find the total amount after simple interest.

BeginnerLearning-pathVariables
Python C++ C#
0 solved
No solutions yet
Medium

Recursive Power

Compute a power recursively by halving the exponent.

BeginnerLearning-pathRecursion
Python C++ C#
0 solved
No solutions yet
Easy

Cash: Fewest Coins

Give change with as few U.S. coins as possible.

BeginnerGreedyStudent-beginnermath
Python C++ C#
0 solved
No solutions yet
Easy

Prime Number Check

Decide whether a number is prime.

BeginnerLoopsNumbersStudent-beginner
Python C++ C#
0 solved
No solutions yet
Easy

First Negative Index

Find where the first negative number appears.

ArraysBeginnerLearning-path
Python C++ C#
0 solved
No solutions yet
Easy

Power by Repeated Multiplication

Raise a number to a power with a loop.

BeginnerLearning-pathLoops
Python C++ C#
0 solved
No solutions yet
Easy

Sum of Odd Numbers

Add every odd number up to a limit.

BeginnerLearning-pathLoops
Python C++ C#
0 solved
No solutions yet
Easy

Row Sums

Add up every row of a grid.

BeginnerGridsLearning-path
Python C++ C#
0 solved
No solutions yet
Easy

Cart Total With Discount

Total a shopping cart and apply a discount above a threshold.

ArraysBeginnerFunctionsLearning-path
Python C++ C#
0 solved
No solutions yet
Easy

Character Frequency

Count how often each character appears.

BeginnerDictionariesStringsStudent-beginner
Python C++ C#
0 solved
No solutions yet
Easy

Swap First and Last

Exchange the first and last items of a list.

ArraysBeginnerLearning-path
Python C++ C#
0 solved
No solutions yet
Easy

Largest of Three

Pick the largest of three numbers without a built-in max.

BeginnerConditionsLearning-path
Python C++ C#
0 solved
No solutions yet
Easy

Countdown to Liftoff

Count down from a number and end with Liftoff!

BeginnerLearning-pathLoops
Python C++ C#
0 solved
No solutions yet
Easy

Body Mass Index

Compute BMI from weight and height.

BeginnerLearning-pathVariables
Python C++ C#
0 solved
No solutions yet
Easy

First Unique Character

Find the first character that appears only once.

BeginnerDictionariesStringsStudent-beginner
Python C++ C#
0 solved
No solutions yet
Easy

Multiplication Table Row

List the first multiples of a number.

BeginnerLearning-pathLoops
Python C++ C#
0 solved
No solutions yet