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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
Languages

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Fresh passing solutions from other developers. Read their code and AI reviews, then solve the challenge to join the discussion.

Easy C++
Average of Three

Passed 6/6 tests

CodeUtility about 23 hours ago AI review pending
Easy Python
Rectangle Perimeter

Passed 6/6 tests

CodeUtility about 23 hours ago AI review pending

All challenges

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150 challenges
Hard

Shortest Delivery Tour

Visit every city once and return home as cheaply as possible.

AdvancedBitmasksCompetitive-programmingDynamic-programming
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

Game of Life Step

Advance Conway's Game of Life by one generation.

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

K-th Smallest Element

Find the k-th smallest value without fully sorting.

AdvancedCompetitive-programmingSorting
Python C++ C#
0 solved
No solutions yet
Hard

Minimum Window Substring

Find the shortest piece of text containing all required characters.

AdvancedCompetitive-programmingSliding-windowStrings
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

Distance Between Points

Compute the straight-line distance between two points.

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

Strongly Connected Components

Count groups of nodes that can all reach each other.

AdvancedCompetitive-programmingGraphs
Python C++ C#
0 solved
No solutions yet
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
Medium

Gradebook Top Student

Find the student with the highest average score.

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

Course Schedule Order

Order courses so every prerequisite comes first.

AdvancedGraphsHackathonTopological-sort
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
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

Median of Two Sorted Arrays

Find the median of two sorted lists combined.

AdvancedBinary-searchCompetitive-programming
Python C++ C#
0 solved
No solutions yet
Medium

Tournament Standings

Rank teams from match records.

DictionariesParsingSorting
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

Average of Three

Average three whole numbers.

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

Count Inversions

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

AdvancedCompetitive-programmingSorting
Python C++ C#
0 solved
No solutions yet