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C# coding challenges

226 challenges you can solve in C#, from first loops to graphs, dynamic programming and machine learning. Write your code in the browser, run the tests instantly and get an AI review.

Easy · 134 Medium · 68 Hard · 24

Skills you'll practise: CountingDigit extractionString splitting2D listsArithmeticFormulasListsLoopsConditionsDivisibilityFloating pointGradient descent
  • Python · C++ · C#
  • Automated tests
  • AI code review
  • Community solutions
Programming
Programming fundamentalsFrom variables to recursion, for beginners
AI and machine learning
AI Learning HubNeural networks, ML and LLMs from scratch Neural networks from scratchNeurons, backpropagation and optimizers Machine learning from scratchRegression, classification and clustering Transformers and LLMs from scratchTokenizers, attention and text generation Classical AI and reinforcement learningSearch, games and reinforcement learning
226
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226 challenges
Easy

Vehicle Tolls

Charge tolls for motorbikes, cars and trucks where trucks extend the basic vehicle rule with axles.

You'll learn InheritanceMethod overriding
BeginnerSimulation
Python C++ C#
0 solved
No solutions yet
Easy

Unique Records

Remove duplicate records that are equal by value, keeping the first of each in order.

You'll learn RecordsValue equality
BeginnerStrings
Python C++ C#
0 solved
No solutions yet
Easy

WhenAll Total Time

Find how long a program takes when each group of tasks runs together with Task.WhenAll and groups run one after another.

You'll learn Async/awaitTask.WhenAll
ArraysBeginner
C++ Python C#
0 solved
No solutions yet
Easy

Sum a Flat JSON Object

Parse a flat JSON object whose values are integers and add up the values.

You'll learn JSON parsingString splitting
ParsingStrings
Python C++ C#
0 solved
No solutions yet
Easy

Split a List Into Chunks

Cut a list into consecutive groups of a fixed size, with a shorter last group if needed.

You'll learn SlicingBatching
ArraysBeginner
Python C++ C#
0 solved
No solutions yet
Easy

Build a JSON Object

Turn keys and values into a JSON object string, escaping quotes and backslashes correctly.

You'll learn JSON formatEscaping
ParsingStrings
Python C++ C#
0 solved
No solutions yet
Easy

Linked List Operations

Simulate a linked list: add at either end, remove from the front or by value, and reverse it.

You'll learn Linked listsSimulation
Data-structuresSimulation
Python C++ C#
0 solved
No solutions yet
Easy

To-Do List

Keep a list of tasks: add them, mark them done, remove them and report what is still pending.

You'll learn Typed collectionsRecords
BeginnerSimulationStrings
Python C++ C#
0 solved
No solutions yet
Easy

Sort by a Chosen Key

Sort people by name or by age with a comparer chosen at run time, breaking ties consistently.

You'll learn ComparersSorting
ArraysSorting
Python C++ C#
0 solved
No solutions yet
Easy

Format an Invoice

Print invoice lines and a total with amounts stored in cents, formatted as dollars and cents.

You'll learn Money in centsString formatting
BeginnerStrings
Python C++ C#
0 solved
No solutions yet

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