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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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15 challenges
Medium

K-th Smallest Element

Find the k-th smallest value without fully sorting.

AdvancedCompetitive-programmingSorting
Python C++ C#
0 solved
No solutions yet
Hard

Shortest Delivery Tour

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

AdvancedBitmasksCompetitive-programmingDynamic-programming
Python C++ C#
0 solved
No solutions yet
Hard

Course Schedule Order

Order courses so every prerequisite comes first.

AdvancedGraphsHackathonTopological-sort
Python C++ C#
0 solved
No solutions yet
Medium

Game of Life Step

Advance Conway's Game of Life by one generation.

AdvancedGridsHackathonSimulation
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
Hard

Longest Path in a DAG

Find the heaviest path in a task dependency graph.

AdvancedGraphsHackathonTopological-sort
Python C++ C#
0 solved
No solutions yet
Hard

Count Inversions

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

AdvancedCompetitive-programmingSorting
Python C++ C#
0 solved
No solutions yet
Medium

Island Perimeter

Measure the coastline of land cells in a grid.

AdvancedGridsHackathon
Python C++ C#
0 solved
No solutions yet
Hard

Median of Two Sorted Arrays

Find the median of two sorted lists combined.

AdvancedBinary-searchCompetitive-programming
Python C++ C#
0 solved
No solutions yet
Hard

Strongly Connected Components

Count groups of nodes that can all reach each other.

AdvancedCompetitive-programmingGraphs
Python C++ C#
0 solved
No solutions yet
Hard

Trapping Rain Water

Compute how much rain water an elevation map holds.

AdvancedArraysCompetitive-programmingGreedy
Python C++ C#
0 solved
No solutions yet
Hard

Largest Rectangle in a Histogram

Find the largest rectangle that fits under a histogram.

AdvancedCompetitive-programmingStacks
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
Hard

Matrix Chain Multiplication

Find the cheapest order to multiply a chain of matrices.

AdvancedCompetitive-programmingDynamic-programming
Python C++ C#
0 solved
No solutions yet
Hard

Sliding Window Maximum

Report the maximum of every window of k numbers.

AdvancedCompetitive-programmingSliding-window
Python C++ C#
0 solved
No solutions yet