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Beginner coding challenges

Practise beginner with 95 coding challenges, from easy to hard. Every challenge runs in your browser with instant tests, an AI review of your code and community solutions to compare.

Easy · 89 Medium · 6

Skills you'll practise: CountingArithmeticDigit extractionFormulasListsString splitting2D listsConditionsDivisibilityLoopsModuloSingle pass
  • 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
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95 challenges
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

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

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

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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