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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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28 challenges
Easy

Remove Duplicates

Keep only the first occurrence of each value.

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

Fibonacci Number

Return the n-th Fibonacci number.

BeginnerLoopsSequencesStudent-beginner
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
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Easy

Cash: Fewest Coins

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

BeginnerGreedyStudent-beginnermath
Python C++ C#
0 solved
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Easy

Prime Number Check

Decide whether a number is prime.

BeginnerLoopsNumbersStudent-beginner
Python C++ C#
0 solved
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Easy

Character Frequency

Count how often each character appears.

BeginnerDictionariesStringsStudent-beginner
Python C++ C#
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Easy

First Unique Character

Find the first character that appears only once.

BeginnerDictionariesStringsStudent-beginner
Python C++ C#
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No solutions yet
Medium

Readability Grade

Estimate the school grade needed to read a text.

BeginnerStringsStudent-beginnermath
Python C++ C#
0 solved
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Easy

Armstrong Number

Check whether a number equals the sum of its digits raised to the digit count.

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

Palindrome Number

Check whether a number reads the same backwards.

BeginnerNumbersStudent-beginner
C++ Python C#
0 solved
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Easy

Least Common Multiple

Find the smallest positive number divisible by both values.

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

Missing Number

Find the one number missing from 0..n.

ArraysBeginnerStudent-beginnermath
Python C++ C#
0 solved
No solutions yet
Easy

Power of Two

Check whether a number is a power of two.

BeginnerNumbersStudent-beginner
Python C++ C#
0 solved
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Easy

Palindrome String

Check whether text reads the same forwards and backwards.

BeginnerStringsStudent-beginner
Python C++ C#
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Easy

Title Case

Capitalize the first letter of every word.

BeginnerStringsStudent-beginner
Python C++ C#
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Easy

Count Vowels

Count the vowels in a piece of text.

BeginnerStringsStudent-beginner
Python C++ C#
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Easy

Anagram Check

Check whether two phrases use the same letters.

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

Greatest Common Divisor

Find the largest number that divides both values.

BeginnerNumbersStudent-beginner
Python C++ C#
0 solved
No solutions yet