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C++ coding challenges
226 challenges you can solve in C++, from first loops to graphs, dynamic programming and machine learning. Write your code in the browser, run the tests instantly and get an AI review.
Easy · 134 Medium · 68 Hard · 24
Skills you'll practise: CountingDigit extractionString splitting2D listsArithmeticFormulasListsLoopsConditionsDivisibilityFloating pointGradient descent
- Python · C++ · C#
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- Community solutions
- 226
- Challenges
- 5
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- 3
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All challenges
Search by topic, language, or difficulty.
Easy
Word Tile Score
Add the tile values for every letter in a word.
You'll learn
Letter scoresSumming with a map
No solutions yet
Easy
First Negative Index
Find where the first negative number appears.
You'll learn
Linear searchEarly return
No solutions yet
Easy
Array Minimum
Find the smallest value in a list.
You'll learn
Tracking a minimumSingle pass
No solutions yet
Easy
Count Vowels
Count the vowels in a piece of text.
You'll learn
Character checksSet membership
No solutions yet
Easy
Second Largest Value
Find the second largest distinct value.
You'll learn
Two trackersDistinct values
No solutions yet
Easy
Sum an Array
Add up all values in a list.
You'll learn
AccumulatorsEmpty-list cases
No solutions yet
Easy
Replace Spaces With Dashes
Turn spaces into dashes to make a URL-style slug.
You'll learn
String buildingCharacter replacement
No solutions yet
Easy
Point Quadrant
Find which quadrant a point lies in.
You'll learn
CoordinatesSign checks
No solutions yet
Easy
Sum of Multiples
Add values below a limit divisible by any supplied factor.
You'll learn
LoopsDivisibility
No solutions yet
Easy
Above-Average Values
Keep the values that are greater than the average.
You'll learn
Two passesFiltering
No solutions yet
Easy
Longest Word
Find the longest word in a sentence.
You'll learn
String splittingTracking a maximum
No solutions yet
Easy
Ticket Price by Age
Choose a cinema ticket price from the visitor's age.
You'll learn
Age rangesBoundary values
No solutions yet
Easy
Initials From a Name
Build uppercase initials from a full name.
You'll learn
String splittingUppercase
No solutions yet
Easy
Array Average
Compute the average of a list of numbers.
You'll learn
Sum and countFloat division
No solutions yet
Easy
Odd, Even, or Neither
Classify a number by whether it is an odd integer, an even integer, or neither.
You'll learn
ModuloConditions
No solutions yet
Easy
Count Uppercase Letters
Count the capital letters in a text.
You'll learn
Character checksCounting
No solutions yet
Medium
Mini-Batch Gradient Descent
Train a linear model by updating the weights after every small batch of samples instead of the whole dataset.
You'll learn
Mini-batchesGradient descent
No solutions yet
Easy
Fizz Buzz
Build a sequence using divisibility by 3 and 5.
You'll learn
ConditionsDivisibility
No solutions yet
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