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Oracle's loops split along two clear axes: OCI (Cloud Infrastructure) runs a fairly standard LC + system-design loop with heavy Indian interviewer rotation, while OHAI (Oracle Health, the post-Cerner business unit) leans into OOD/class-design problems built around healthcare scenarios. Coding bars are mostly easy-to-medium, but interviewer variance and post-loop down-leveling / ghosting are unusually common — the loop result often determines the eventual level, not just the yes/no.

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Set Matrix Zeros (in-place)

Given a 2D integer matrix, set every cell sharing a row or column with a zero to zero, in place. Asked as the coding portion of an OCI IC4 phone screen with two follow-ups: handle ragged (non-rectangular) input, and generalise to char[][] with an arbitrary marker value.

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OJ Problems

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Implement a Queue Using Two Stacks Missing Number Compare two N-ary trees for equality Generate all permutations of a list Validate Parentheses String First Unique Login User Implement LRU Cache Find Users with Valid Session Find Anagram Positions in Phrases Merge K Sorted Lists with Key-Value Pairs Simplified Course Scheduler Maximum on Both Sides List All LRU Cache Possibilities Shopping List Price Calculation Task Completion with Prerequisites Design a Cache Leetcode Two Pointers Original Question Leetcode Heap Original Question Design Dropbox Insert Intervals with Set Find File with Phone Number Multithreading Functionality Maximum Product Subarray in O(n) Time Minimum Difference Sum Merge 2 Arrays Powers of 2 Create Lexicographically Largest Permutation Adding Two Numbers Array Reduction 1 Balancing Parentheses

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