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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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25 challenges
Hard

Find Many Patterns in Text

For each requested pattern, decide whether it appears as a contiguous substring anywhere in the shared text.

Pattern-matchingStringsTries
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

Roman Numeral Value

Convert a Roman numeral to a number.

BeginnerLookup-tablesStringsStudent-beginner
Python C++ C#
0 solved
No solutions yet
Easy

Every Other Character

Keep the characters at even positions.

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

DNA to RNA Transcription

Build an RNA string by replacing every DNA character with its partner.

MappingStrings
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
Medium

Recursive Palindrome

Check a palindrome recursively, ignoring case and punctuation.

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

Word Tile Score

Add the tile values for every letter in a word.

Lookup-tablesStrings
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
Easy

Initials From a Name

Build uppercase initials from a full name.

BeginnerLearning-pathStrings
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

Replace Spaces With Dashes

Turn spaces into dashes to make a URL-style slug.

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

First Unique Character

Find the first character that appears only once.

BeginnerDictionariesStringsStudent-beginner
Python C++ C#
0 solved
No solutions yet
Easy

Character Frequency

Count how often each character appears.

BeginnerDictionariesStringsStudent-beginner
Python C++ C#
0 solved
No solutions yet
Easy

Longest Word

Find the longest word in a sentence.

BeginnerStringsStudent-beginner
Python C++ C#
0 solved
No solutions yet
Easy

Password Rules Check

Check a password against simple strength rules.

BeginnerConditionsLearning-pathStrings
Python C++ C#
0 solved
No solutions yet
Easy

Acronym Generator

Create an acronym from the first letter of every word, in uppercase.

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

Hamming Distance

Compare two DNA strings position by position and count the differences.

SequencesStrings
Python C++ C#
0 solved
No solutions yet