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- Challenges
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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- 150
- Challenges
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All challenges
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Medium
Two Nonattacking Knights
Count safe placements of two knights for each square board size.
No solutions yet
Hard
Minimum Elevator Rides
Group people into as few weight-limited elevator rides as possible.
No solutions yet
Hard
Count Numbers With Distinct Neighbors
Count range values whose adjacent decimal digits are never equal.
No solutions yet
Medium
Subtract Digits to Reach Zero
Use as few digit subtractions as possible to reach zero.
No solutions yet
Medium
Number Spiral Lookup
Find a value by row and column in an expanding number spiral.
No solutions yet
Easy
Sum Even Fibonacci Terms
Add the even Fibonacci terms that do not exceed a limit.
No solutions yet
Easy
Make an Array Nondecreasing
Find the fewest increments needed so each value is at least the previous one.
No solutions yet
Easy
Hamming Distance
Compare two DNA strings position by position and count the differences.
No solutions yet
Hard
Find Many Patterns in Text
For each requested pattern, decide whether it appears as a contiguous substring anywhere in the shared text.
No solutions yet
Easy
Pascal’s Triangle
Build rows by adding neighboring entries from the previous row.
No solutions yet