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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
Languages

All challenges

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150 challenges
Easy

Halve Until One

Count how many halvings bring a number down to 1.

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

Course Schedule Order

Order courses so every prerequisite comes first.

AdvancedGraphsHackathonTopological-sort
Python C++ C#
0 solved
No solutions yet
Easy

Pangram Check

A pangram contains every English letter at least once.

SetsStrings
Python C++ C#
0 solved
No solutions yet
Easy

Roman Numeral Value

Convert a Roman numeral to a number.

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

Average of Three

Average three whole numbers.

BeginnerLearning-pathVariables
Python C++ C#
1 solved
View solutions (1)
Medium

Count Islands

Count groups of connected land cells in a grid.

BeginnerGridsLearning-pathRecursion
Python C++ C#
0 solved
No solutions yet
Medium

Find Right-Triangle Triples

List all integer right triangles with a specified perimeter.

GeometryNumber-theory
Python C++ C#
0 solved
No solutions yet
Medium

Factory Production Time

Find the earliest time parallel machines can finish a target number of items.

AlgorithmsBinary-search
Python C++ C#
0 solved
No solutions yet
Easy

Every Other Character

Keep the characters at even positions.

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

Digit Power Sum

Add each digit raised to its position from the left.

Algorithms
Python C++ C#
0 solved
No solutions yet
Easy

Min and Max Together

Find the smallest and largest value in one pass.

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

Days in a Month

Return how many days a month has, including leap years.

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

Remove Duplicates

Keep only the first occurrence of each value.

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

Count Dice Sequences

Count ordered die-roll sequences with a given total.

CombinatoricsDynamic-programming
Python C++ C#
0 solved
No solutions yet
Medium

Digital Root

Sum the digits repeatedly until one digit remains.

Algorithms
Python C++ C#
0 solved
No solutions yet
Medium

Sum of Primes Below a Limit

Add all primes strictly below a limit.

Number-theorySieve
Python C++ C#
0 solved
No solutions yet
Easy

DNA to RNA Transcription

Build an RNA string by replacing every DNA character with its partner.

MappingStrings
Python C++ C#
0 solved
No solutions yet
Easy

Classify a Number by Its Divisors

Classify a positive integer as perfect, abundant, or deficient.

BeginnerNumber-theory
Python C++ C#
0 solved
No solutions yet