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Oracle LeetCode Questions 2026

Browse LeetCode problems frequently asked by Oracle. Filter by difficulty and timeframe to focus your interview prep.

Last updated: 20 Feb 2026

Timeframe

Difficulty

Problem	Difficulty	Frequency	Topics
Two Sum	EASY	87.5%	ArrayHash Table
Add Two Numbers	MEDIUM	50%	Linked ListMathRecursion
Longest Substring Without Repeating Characters	MEDIUM	87.5%	Hash TableStringSliding Window
Median of Two Sorted Arrays	HARD	50%	ArrayBinary SearchDivide and Conquer
Longest Palindromic Substring	MEDIUM	75%	Two PointersStringDynamic Programming
Zigzag Conversion	MEDIUM	50%	String
Container With Most Water	MEDIUM	62.5%	ArrayTwo PointersGreedy
Integer to Roman	MEDIUM	50%	Hash TableMathString
Roman to Integer	EASY	62.5%	Hash TableMathString
Longest Common Prefix	EASY	50%	ArrayStringTrie
Regular Expression Matching	HARD	37.5%	StringDynamic ProgrammingRecursion
Letter Combinations of a Phone Number	MEDIUM	50%	Hash TableStringBacktracking
3Sum	MEDIUM	62.5%	ArrayTwo PointersSorting
Merge Two Sorted Lists	EASY	50%	Linked ListRecursion
Generate Parentheses	MEDIUM	62.5%	StringDynamic ProgrammingBacktracking
Merge k Sorted Lists	HARD	75%	Linked ListDivide and ConquerHeap (Priority Queue)Merge Sort
Remove Duplicates from Sorted Array	EASY	37.5%	ArrayTwo Pointers
Longest Valid Parentheses	HARD	50%	StringDynamic ProgrammingStack
Search in Rotated Sorted Array	MEDIUM	62.5%	ArrayBinary Search
Find First and Last Position of Element in Sorted Array	MEDIUM	50%	ArrayBinary Search

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