Grokking Google Coding Interview

It is the 50 coding questions asked most frequently in Google interviews, each split into a problem lesson you attempt in the browser and a solution lesson with the approach, diagrams, code in six languages, and the complexity analysis.

Engineers with a Google loop coming up. It assumes you already have your data structures and coding patterns and want targeted, final-phase practice. If the patterns themselves are still new, work through Grokking the Coding Interview first and come back to this in the last few weeks.

Fifty, among them Add Binary, Is Subsequence, Binary Tree Paths, Monotonic Array, Letter Combinations of a Phone Number, 01 Matrix, Rotate Image, Combination Sum, Implement Trie, Number of Islands, Edit Distance, Meeting Rooms II, Container With Most Water, Minimum Area Rectangle, Find Leaves of Binary Tree, Trapping Rain Water, First Missing Positive, Burst Balloons, Candy, and Reverse Pairs.

Harder than most, and the difficulty split here reflects it: 10 of the 50 problems are genuinely hard, and the medium band skews toward the upper end of medium. Google also weights how you arrive at a solution more heavily than most companies, which is why every solution lesson walks through the reasoning rather than presenting finished code.

15 easy, 25 medium, and 10 hard. The medium band is deliberately the largest, because that is where most interview slots sit, but the hard chapter is worth doing rather than skipping given how often Google reaches into it.

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.

For the coding rounds it is strong, focused preparation, but the loop is wider than coding. Google also runs system design and behavioral rounds, and no problem list can promise the exact questions you will be asked. Treat the 50 as a way to recognise structures quickly rather than as a set to memorise.

Grokking the Coding Interview teaches pattern recognition from scratch across more than 300 problems. This narrows to one company and assumes those patterns are already there. The natural sequence is patterns first and this second, in the weeks immediately before the interview.

Text-based, with runnable code and diagrams on the solutions. Practice means attempting, failing, and rereading the walkthrough, and that loop is much 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.