Grokking LinkedIn Coding Interview

It is the 40 coding questions asked most frequently in LinkedIn interviews. Each is a problem lesson you attempt in an in-browser editor, followed by a solution lesson with the approach, a step by step algorithm, a walkthrough, code in six languages, and the complexity analysis.

Engineers with a LinkedIn loop coming up who already have their data structures and patterns and want targeted final practice. If the patterns are still new, start with Grokking the Coding Interview and come back to this in the last few weeks.

Forty, among them Find Pivot Index, Isomorphic Strings, Valid Palindrome, Can Place Flowers, Sqrt, Rotate List, Find Leaves of Binary Tree, Valid Parenthesis String, Edit Distance, Decode Ways, Search in Rotated Array, Word Search, House Robber II, Coin Change, Design Add and Search Words Data Structure, Merge Intervals, Max Points on a Line, Word Ladder, Median of Two Sorted Arrays, and Serialize and Deserialize Binary Tree.

10 easy, 24 medium, and 6 hard. LinkedIn leans medium more than it leans hard, so most of your time here is spent where most of your interview time will be.

A fairly conventional data structures and algorithms loop with a visible preference for tree problems, string manipulation, and questions that ask you to design a data structure rather than just use one. The problem mix reflects that. LinkedIn also weights clear communication heavily, which is why the solutions explain the route to an answer rather than only the answer.

Because the set is drawn from what LinkedIn actually asks rather than padded to a round number. Forty questions that recur is more useful preparation than fifty where the last ten are filler, and the shorter set is realistically finishable in the time most people have before an interview.

Python, Java, C++, JavaScript, Go, and C#. Every solution is given in all six, so you can practise in the language you plan to use on the day.

It is focused preparation for the coding rounds, not the whole loop. LinkedIn also runs system design and behavioral rounds, and no list can promise the questions you get. Treat the 40 as a way to make the underlying structures recognisable quickly.

Text-based, with runnable code. Practice means attempting, running, failing, and rereading the walkthrough, and that cycle is far tighter on a page than in a video.

Yes. Design Gurus issues a certificate once you have completed the course, and you can share the link directly or add it to your LinkedIn profile.