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Competitive programming coding challenges

Practise competitive programming with 10 coding challenges, from easy to hard. Every challenge runs in your browser with instant tests, an AI review of your code and community solutions to compare.

Medium · 1 Hard · 9

Skills you'll practise: Area calculationBitmask DPDivide and conquerFrequency mapsGraph algorithmsGrow and shrink windowsInterval DPMerge sortMonotonic dequeMonotonic stackO(log n)O(n) windows
  • 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
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10 challenges
Hard

Shortest Delivery Tour

Visit every city once and return home as cheaply as possible.

You'll learn Bitmask DPTraveling salesman
AdvancedBitmasksCompetitive-programmingDynamic-programming
Python C++ C#
0 solved
No solutions yet
Hard

Strongly Connected Components

Count groups of nodes that can all reach each other.

You'll learn Graph algorithmsTarjan or Kosaraju
AdvancedCompetitive-programmingGraphs
Python C++ C#
0 solved
No solutions yet
Hard

Minimum Window Substring

Find the shortest piece of text containing all required characters.

You'll learn Grow and shrink windowsFrequency maps
AdvancedCompetitive-programmingSliding-windowStrings
Python C++ C#
0 solved
No solutions yet
Hard

Median of Two Sorted Arrays

Find the median of two sorted lists combined.

You'll learn Partition searchO(log n)
AdvancedBinary-searchCompetitive-programming
Python C++ C#
0 solved
No solutions yet
Medium

K-th Smallest Element

Find the k-th smallest value without fully sorting.

You'll learn QuickselectPartitioning
AdvancedCompetitive-programmingSorting
Python C++ C#
0 solved
No solutions yet
Hard

Largest Rectangle in a Histogram

Find the largest rectangle that fits under a histogram.

You'll learn Monotonic stackArea calculation
AdvancedCompetitive-programmingStacks
Python C++ C#
0 solved
No solutions yet
Hard

Count Inversions

Count the out-of-order pairs in a list.

You'll learn Merge sortDivide and conquer
AdvancedCompetitive-programmingSorting
Python C++ C#
0 solved
No solutions yet
Hard

Trapping Rain Water

Compute how much rain water an elevation map holds.

You'll learn Two pointersPrefix maxima
AdvancedArraysCompetitive-programmingGreedy
Python C++ C#
0 solved
No solutions yet
Hard

Sliding Window Maximum

Report the maximum of every window of k numbers.

You'll learn Monotonic dequeO(n) windows
AdvancedCompetitive-programmingSliding-window
Python C++ C#
0 solved
No solutions yet
Hard

Matrix Chain Multiplication

Find the cheapest order to multiply a chain of matrices.

You'll learn Interval DPOptimization
AdvancedCompetitive-programmingDynamic-programming
Python C++ C#
0 solved
No solutions yet

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