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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.
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Easy
Doubling Grains on a Chessboard
Calculate a square’s grain count and the total on all 64 squares.
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Easy
Sum Even Fibonacci Terms
Add the even Fibonacci terms that do not exceed a limit.
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Easy
Hamming Distance
Compare two DNA strings position by position and count the differences.
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Medium
Longest Common Subsequence Length
A subsequence is formed by deleting zero or more elements while preserving the order of the remaining elements.
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