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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
0
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150 challenges
Easy

Halve Until One

Count how many halvings bring a number down to 1.

BeginnerLearning-pathLoops
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
Easy

First Negative Index

Find where the first negative number appears.

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

Average of Three

Average three whole numbers.

BeginnerLearning-pathVariables
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

Simple Interest

Find the total amount after simple interest.

BeginnerLearning-pathVariables
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
Hard

Word Break

Decide whether text can be split into dictionary words.

AdvancedDynamic-programmingHackathonStrings
Python C++ C#
0 solved
No solutions yet
Easy

Cart Total With Discount

Total a shopping cart and apply a discount above a threshold.

ArraysBeginnerFunctionsLearning-path
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
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
Hard

Maximum Project Rewards

Choose nonoverlapping projects to earn the largest total reward.

Dynamic-programmingScheduling
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

Game of Life Step

Advance Conway's Game of Life by one generation.

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

Cash: Fewest Coins

Give change with as few U.S. coins as possible.

BeginnerGreedyStudent-beginnermath
Python C++ C#
0 solved
No solutions yet
Medium

Count Dice Sequences

Count ordered die-roll sequences with a given total.

CombinatoricsDynamic-programming
Python C++ C#
0 solved
No solutions yet
Easy

Above-Average Values

Keep the values that are greater than the average.

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

Matrix Chain Multiplication

Find the cheapest order to multiply a chain of matrices.

AdvancedCompetitive-programmingDynamic-programming
Python C++ C#
0 solved
No solutions yet