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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#
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Learning path
150
Challenges
2
Solutions shared
3
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All challenges

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150 challenges
Medium

Digit Power Sum

Add each digit raised to its position from the left.

Algorithms
Python C++ C#
0 solved
No solutions yet
Medium

Shortest Weighted Routes

Find the minimum total route cost from city 1 to each city.

GraphsPriority-queuesShortest-path
Python C++ C#
0 solved
No solutions yet
Medium

Digital Root

Sum the digits repeatedly until one digit remains.

Algorithms
Python C++ C#
0 solved
No solutions yet
Hard

Minimum Network Connection Cost

Choose undirected links so that every vertex can reach every other vertex, with minimum total cost.

Disjoint-setsGraphsMinimum-spanning-tree
Python C++ C#
0 solved
No solutions yet
Hard

Longest Path in a DAG

Find the heaviest path in a task dependency graph.

AdvancedGraphsHackathonTopological-sort
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

Min and Max Together

Find the smallest and largest value in one pass.

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

Word Tile Score

Add the tile values for every letter in a word.

Lookup-tablesStrings
Python C++ C#
0 solved
No solutions yet
Hard

Count Inversions

Count the out-of-order pairs in a list.

AdvancedCompetitive-programmingSorting
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

Every Other Character

Keep the characters at even positions.

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

Hotel Room Allocation

Assign arriving groups in order.

Segment-treesSimulation
Python C++ C#
0 solved
No solutions yet
Medium

Right-Triangle Product

Find the largest side product of an integer right triangle with a given perimeter.

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

Triangle Classification

Classify three side lengths as invalid, equilateral, isosceles, or scalene.

ConditionsGeometry
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
Medium

List Primes With a Sieve

Find primes up to a limit by marking composite multiples.

Number-theorySieve
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

Average of Three

Average three whole numbers.

BeginnerLearning-pathVariables
Python C++ C#
1 solved
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