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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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150
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150 challenges
Easy

Missing Number

Find the one number missing from 0..n.

ArraysBeginnerStudent-beginnermath
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
Easy

Remove Duplicates

Keep only the first occurrence of each value.

ArraysBeginnerSetsStudent-beginner
Python C++ C#
0 solved
No solutions yet
Medium

Recursive Palindrome

Check a palindrome recursively, ignoring case and punctuation.

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

Median of a List

Find the middle value of a list after sorting.

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

Swap First and Last

Exchange the first and last items of a list.

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

Subtract Digits to Reach Zero

Use as few digit subtractions as possible to reach zero.

Dynamic-programmingNumbers
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
Medium

Island Perimeter

Measure the coastline of land cells in a grid.

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

Exact Fraction Arithmetic

Perform fraction operations and return a reduced fraction.

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

Largest Rectangle in a Histogram

Find the largest rectangle that fits under a histogram.

AdvancedCompetitive-programmingStacks
Python C++ C#
0 solved
No solutions yet
Easy

Largest of Three

Pick the largest of three numbers without a built-in max.

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

Longest Common Subsequence Length

A subsequence is formed by deleting zero or more elements while preserving the order of the remaining elements.

Dynamic-programmingSequences
Python C++ C#
0 solved
No solutions yet
Easy

Count Positive Numbers

Count the values greater than zero in a list.

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#
0 solved
No solutions yet
Easy

Count Uppercase Letters

Count the capital letters in a text.

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

Recursive Power

Compute a power recursively by halving the exponent.

BeginnerLearning-pathRecursion
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