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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

All challenges

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150 challenges
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
Medium

Count Coin Combinations

Count ways to make an amount with unlimited coins of specified denominations.

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

Count Grid Paths

Count routes across a rectangular grid using only right and down moves.

CombinatoricsDynamic-programming
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

Count Handshakes

Count handshakes when every pair of people shakes hands once.

Combinatoricsmath
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
Medium

Flatten Arbitrarily Nested Lists (Recursion)

Practice recursion by flattening arbitrarily nested lists while skipping null entries.

Data-structuresRecursion
Python C++ C#
0 solved
No solutions yet
Medium

Two Nonattacking Knights

Count safe placements of two knights for each square board size.

Combinatoricsmath
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
Hard

Cut a Rectangle Into Squares

Find the fewest straight cuts needed to produce only squares.

Dynamic-programmingGeometry
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

Rectangle Perimeter

Compute the perimeter of a rectangle from its sides.

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

Simple Interest

Find the total amount after simple interest.

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

Mini Stack-Language Interpreter

Evaluate a small stack language.

InterpretersParsingStacks
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
Easy

Doubling Grains on a Chessboard

Calculate a square’s grain count and the total on all 64 squares.

NumbersSequences
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
Hard

Hotel Room Allocation

Assign arriving groups in order.

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