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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
Hours, Minutes, and Seconds
Convert a duration in seconds to a compact readable string.
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Medium
Count Grid Paths
Count routes across a rectangular grid using only right and down moves.
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Hard
Minimum Elevator Rides
Group people into as few weight-limited elevator rides as possible.
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Hard
Cut a Rectangle Into Squares
Find the fewest straight cuts needed to produce only squares.
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Medium
Factory Production Time
Find the earliest time parallel machines can finish a target number of items.
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Medium
Number Spiral Lookup
Find a value by row and column in an expanding number spiral.
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Easy
Armstrong Number
Check whether a number equals the sum of its digits raised to the digit count.
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