Talentd
For employersSign in
JobsInternshipsPracticeResume toolsCompaniesArticles
For employers
FleetCode
Make and follow sheets.Sign in

Solutions, explained

Every approach from brute force to the best one, with code in Python, Java, C++ and more.

Has video
GraphArray2,100String848Hash Table764Math642Dynamic Programming606Sorting493Greedy457Binary Search334Depth-First Search318Database302Matrix267Bit Manipulation263All topics

With video · 169 results

The Maze III

499.The Maze III

HardArrayBreadth-First SearchDepth-First Search52.3% acceptance1 companyPremium elsewhere, free hereVideo
The Maze II

505.The Maze II

MediumArrayBreadth-First SearchDepth-First Search55.0% acceptance5 companiesPremium elsewhere, free hereVideo
Tree Diameter

1245.Tree Diameter

MediumBreadth-First SearchDepth-First SearchGraph61.1% acceptance7 companiesPremium elsewhere, free hereVideo
Showing 1–50 of 169

How to use these solutions

Each solution breaks the problem into approaches, usually from brute force to the best one, and explains why each works. Code comes in Python, Java, C++ and other languages. Knowing why an approach works matters more in an interview than remembering the code.

  • Try the problem first. Give it at least 20 minutes before you open the solution.
  • Read every approach. The brute force shows you the problem; the faster ones show the pattern.
  • Check the complexity. Note the time and space of each approach and what makes the difference.
  • Write it yourself. Close the solution and code it from memory in the editor.
  • Come back in a week. Solving it again later is what makes the pattern stick.
All problemsTopicsCompany questionsSheets