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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#
  • Automated tests
  • AI code review
  • Community solutions
Programming
Programming fundamentalsFrom variables to recursion, for beginners
AI and machine learning
AI Learning HubNeural networks, ML and LLMs from scratch Neural networks from scratchNeurons, backpropagation and optimizers Machine learning from scratchRegression, classification and clustering Transformers and LLMs from scratchTokenizers, attention and text generation Classical AI and reinforcement learningSearch, games and reinforcement learning
226
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5
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226 challenges
Easy

Hamming Distance

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

You'll learn String comparisonCounting
SequencesStrings
Python C++ C#
0 solved
No solutions yet
Easy

Move Zeroes

Move every zero to the end while keeping the other order.

You'll learn Two pointersIn-place updates
ArraysBeginnerStudent-beginner
Python C++ C#
0 solved
No solutions yet
Easy

Rotate Array

Rotate a list to the right by some steps.

You'll learn Array indexingModulo
ArraysBeginnerStudent-beginner
Python C++ C#
0 solved
No solutions yet
Easy

Running Sum

Replace each value with the total so far.

You'll learn Prefix sumsLists
ArraysBeginnerLearning-path
Python C++ C#
0 solved
No solutions yet
Medium

Right-Triangle Product

Find the largest side product of an integer right triangle with a given perimeter.

You'll learn Right trianglesSearch pruning
GeometryNumber-theory
Python C++ C#
0 solved
No solutions yet
Medium

Flatten Arbitrarily Nested Lists (Recursion)

Practice recursion by flattening arbitrarily nested lists while skipping null entries.

You'll learn Base casesNested data
Data-structuresRecursion
Python C++ C#
0 solved
No solutions yet
Medium

Minimax Tic-Tac-Toe

Pick the perfect tic-tac-toe move by searching the whole game tree with minimax.

You'll learn MinimaxGame trees
Recursionai
Python C++ C#
0 solved
No solutions yet
Medium

Largest Adjacent-Digit Product

Take every contiguous window of span digits and multiply its digits.

You'll learn Fixed-size windowsDigit strings
NumbersSliding-window
Python C++ C#
0 solved
No solutions yet
Easy

Gradient Descent with Momentum

Apply momentum updates, which keep part of the previous step so training speeds up along consistent directions.

You'll learn MomentumOptimizers
Neural networksaimachine learning
Python C++ C#
0 solved
No solutions yet
Easy

Count Words

Count the words in a sentence.

You'll learn String splittingWhitespace
BeginnerStringsStudent-beginner
Python C++ C#
0 solved
No solutions yet
Easy

Classify a Number by Its Divisors

Classify a positive integer as perfect, abundant, or deficient.

You'll learn DivisorsClassification
BeginnerNumber-theory
Python C++ C#
0 solved
No solutions yet
Easy

Xavier and He Weight Initialization

Compute the range or standard deviation used to initialize the weights of a layer.

You'll learn Xavier and He initTraining stability
Neural networksaimachine learning
C# Python C++
0 solved
No solutions yet
Hard

Train a Neural Network to Solve XOR

Combine everything: train a 2-2-1 sigmoid network with backpropagation until it learns XOR.

You'll learn Neural network trainingXOR problem
Neural networksaimachine learning
Python C++ C#
0 solved
No solutions yet
Easy

Difference of Squares

Subtract the sum of squares from the square of the sum.

You'll learn FormulasArithmetic
Beginnermath
Python C++ C#
0 solved
No solutions yet
Easy

Pascal’s Triangle

Build rows by adding neighboring entries from the previous row.

You'll learn 2D listsBuilding from previous rows
ArraysCombinatorics
Python C++ C#
0 solved
No solutions yet
Medium

Adam Optimizer

Implement Adam, the default optimizer for deep learning, with moving averages and bias correction.

You'll learn AdamBias correction
Neural networksaimachine learning
Python C++ C#
0 solved
No solutions yet
Easy

Chess Square Color

Determine the color of a square on an 8 by 8 board.

You'll learn CoordinatesParity
Beginnermath
Python C++ C#
0 solved
No solutions yet
Hard

Multi-Head Self-Attention

Project the input into queries, keys and values, run attention in several heads in parallel, and combine them.

You'll learn Multi-head attentionMatrix projections
aimachine learning
Python C++ C#
0 solved
No solutions yet

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