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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
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
Medium

Tournament Standings

Rank teams from match records.

DictionariesParsingSorting
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
Hard

Count Inversions

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

AdvancedCompetitive-programmingSorting
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

Pyramid Rows

Draw a right-aligned pyramid of # blocks.

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

Pangram Check

A pangram contains every English letter at least once.

SetsStrings
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

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
Easy

Roman Numeral Value

Convert a Roman numeral to a number.

BeginnerLookup-tablesStringsStudent-beginner
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
Hard

Course Schedule Order

Order courses so every prerequisite comes first.

AdvancedGraphsHackathonTopological-sort
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

Digit Power Sum

Add each digit raised to its position from the left.

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

Factory Production Time

Find the earliest time parallel machines can finish a target number of items.

AlgorithmsBinary-search
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
Medium

Gradebook Top Student

Find the student with the highest average score.

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