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Learning path coding challenges

Practise learning path with 40 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 · 35 Medium · 5

Skills you'll practise: Lists2D listsCountingArithmeticFormulasAccumulatorsAge rangesAveragesAvoiding double countsBase casesBoolean flagsBoundary values
  • 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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40 challenges
Easy

First Negative Index

Find where the first negative number appears.

You'll learn Linear searchEarly return
ArraysBeginnerLearning-path
Python C++ C#
0 solved
No solutions yet
Easy

Count Positive Numbers

Count the values greater than zero in a list.

You'll learn ListsCounting
ArraysBeginnerLearning-path
Python C++ C#
0 solved
No solutions yet
Easy

Above-Average Values

Keep the values that are greater than the average.

You'll learn Two passesFiltering
ArraysBeginnerLearning-path
Python C++ C#
0 solved
No solutions yet
Easy

Running Sum

Replace each value with the total so far.

You'll learn Prefix sumsLists
ArraysBeginnerLearning-path
Python C++ C#
0 solved
No solutions yet

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