Grokking Oracle Coding Interview

It is the 50 coding questions asked most frequently in Oracle interviews. Each comes as 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, and code in six languages.

Engineers interviewing at Oracle, including its cloud and database organisations. It assumes your data structures and patterns are already in place and gives you company-specific practice for the final stretch rather than teaching the fundamentals from scratch.

Fifty, among them Valid Parentheses, Move Zeroes, Island Perimeter, Climbing Stairs, Group Anagrams, Decode String, Asteroid Collision, Sort Colors, Spiral Matrix, Rotting Oranges, Meeting Rooms II, Merge Intervals, 3Sum, Container With Most Water, Validate Binary Search Tree, Trapping Rain Water, Sudoku Solver, Merge K Sorted Lists, Integer to English Words, and Median of Two Sorted Arrays.

10 easy, 30 medium, and 10 hard. That is a heavier medium weighting than most company courses, and it matches the pattern of Oracle loops, where the bulk of the questions are solidly medium and the hard ones appear mostly at senior level.

Largely a conventional data structures and algorithms loop, with a visible preference for string and stack manipulation, matrix traversal, and tree problems. Oracle is a large company with quite different teams, so the exact bar varies by organisation, but the question style is consistent enough for a focused list to be worth doing.

Python, Java, C++, JavaScript, Go, and C#. Every solution is given in all six, which is worth noting for Oracle in particular, where Java is common.

It is focused preparation for the coding rounds rather than the whole loop. Oracle interviews also include system design at most levels and behavioral questions throughout, and no problem list can promise the questions you will get. The purpose of the 50 is to make the underlying shapes recognisable.

Grokking the Coding Interview teaches pattern recognition from the ground up across a much larger problem set. This narrows to one company and assumes the patterns are there, so it belongs at the end of your preparation rather than the start.

Text-based, with runnable code and diagrams on the solutions. Attempting, failing, and rereading is the loop that builds recall, and it is far faster 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.