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Sequences coding challenges

Practise sequences with 5 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 · 4 Medium · 1

Skills you'll practise: 2D DP tablesBig numbersCountingFilteringIterationMemory optimizationPowers of twoSequence generationString comparisonUpdating two variables
  • 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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5 challenges
Easy

Fibonacci Number

Return the n-th Fibonacci number.

You'll learn IterationUpdating two variables
BeginnerLoopsSequencesStudent-beginner
Python C++ C#
0 solved
No solutions yet
Easy

Doubling Grains on a Chessboard

Calculate a square’s grain count and the total on all 64 squares.

You'll learn Powers of twoBig numbers
NumbersSequences
Python C++ C#
0 solved
No solutions yet
Easy

Sum Even Fibonacci Terms

Add the even Fibonacci terms that do not exceed a limit.

You'll learn Sequence generationFiltering
NumbersSequences
Python C++ C#
0 solved
No solutions yet
Medium

Longest Common Subsequence Length

A subsequence is formed by deleting zero or more elements while preserving the order of the remaining elements.

You'll learn 2D DP tablesMemory optimization
Dynamic-programmingSequences
Python C++ C#
0 solved
No solutions yet
Easy

Hamming Distance

Compare two DNA strings position by position and count the differences.

You'll learn String comparisonCounting
SequencesStrings
Python C++ C#
0 solved
No solutions yet

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