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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.

  • Python · C++ · C#
  • Automated tests
  • AI code review
  • Community solutions
Learning path
150
Challenges
2
Solutions shared
3
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All challenges

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84 challenges
Easy

Count Pairs With a Sum

Count pairs of positions whose values add up to a target.

ArraysBeginnerLearning-pathNested-loops
Python C++ C#
0 solved
No solutions yet
Easy

Number Triangle

Build a triangle of increasing numbers.

BeginnerLearning-pathNested-loopsPatterns
Python C++ C#
0 solved
No solutions yet
Easy

Multiplication Grid

Build a full multiplication table.

BeginnerLearning-pathNested-loops
Python C++ C#
0 solved
No solutions yet
Easy

Pyramid Rows

Draw a right-aligned pyramid of # blocks.

BeginnerLearning-pathNested-loopsPatterns
Python C++ C#
0 solved
No solutions yet
Medium

Gradebook Top Student

Find the student with the highest average score.

BeginnerFunctionsGridsLearning-path
Python C++ C#
0 solved
No solutions yet
Easy

Distance Between Points

Compute the straight-line distance between two points.

BeginnerFunctionsLearning-pathmath
Python C++ C#
0 solved
No solutions yet
Easy

Hollow Square

Draw the outline of a square with * characters.

BeginnerLearning-pathNested-loopsPatterns
Python C++ C#
0 solved
No solutions yet
Easy

Celsius to Fahrenheit

Convert a temperature from Celsius to Fahrenheit.

BeginnerLearning-pathVariables
Python C++ C#
0 solved
No solutions yet
Easy

Roman Numeral Value

Convert a Roman numeral to a number.

BeginnerLookup-tablesStringsStudent-beginner
Python C++ C#
0 solved
No solutions yet
Easy

Average of Three

Average three whole numbers.

BeginnerLearning-pathVariables
Python C++ C#
1 solved
View solutions (1)
Easy

Halve Until One

Count how many halvings bring a number down to 1.

BeginnerLearning-pathLoops
Python C++ C#
0 solved
No solutions yet
Easy

Remove Duplicates

Keep only the first occurrence of each value.

ArraysBeginnerSetsStudent-beginner
Python C++ C#
0 solved
No solutions yet
Easy

Every Other Character

Keep the characters at even positions.

BeginnerLearning-pathStrings
Python C++ C#
0 solved
No solutions yet
Medium

Count Islands

Count groups of connected land cells in a grid.

BeginnerGridsLearning-pathRecursion
Python C++ C#
0 solved
No solutions yet
Easy

Classify a Number by Its Divisors

Classify a positive integer as perfect, abundant, or deficient.

BeginnerNumber-theory
Python C++ C#
0 solved
No solutions yet
Easy

Min and Max Together

Find the smallest and largest value in one pass.

ArraysBeginnerFunctionsLearning-path
Python C++ C#
0 solved
No solutions yet
Easy

Days in a Month

Return how many days a month has, including leap years.

BeginnerConditionsFunctionsLearning-path
Python C++ C#
0 solved
No solutions yet
Easy

First Negative Index

Find where the first negative number appears.

ArraysBeginnerLearning-path
Python C++ C#
0 solved
No solutions yet