Question bank

4,310 interview questions, answered.

Reference answers, what the interviewer is really testing, how it is graded, and the follow-ups that come next.

Easy 190Medium 2,498Hard 982
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7 questions

  1. 1Walls and GatesCoding· Amazon, BitGo
  2. 2Linked List CycleEasyCoding· CCognitree
  3. 3Maximum Depth of Binary TreeEasyCoding· Blinkit, Infosys
  4. 4Balanced TreeMediumCoding· Spotify, Uber
  5. 5Find the longest substring without repeating characters.MediumCoding· Apple, Intuit
  6. 6Find the lowest common ancestor (LCA) of two nodes in a binary tree.MediumCoding· Apple, LinkedIn
  7. 7Valid ParenthesesEasyCoding· Apple, Booking.com