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Apple LeetCode Questions 2026

Browse LeetCode problems frequently asked by Apple. 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	75%	Hash TableStringSliding Window
Median of Two Sorted Arrays	HARD	62.5%	ArrayBinary SearchDivide and Conquer
Longest Palindromic Substring	MEDIUM	62.5%	Two PointersStringDynamic Programming
Zigzag Conversion	MEDIUM	37.5%	String
Reverse Integer	MEDIUM	75%	Math
String to Integer (atoi)	MEDIUM	37.5%	String
Palindrome Number	EASY	25%	Math
Regular Expression Matching	HARD	50%	StringDynamic ProgrammingRecursion
Container With Most Water	MEDIUM	50%	ArrayTwo PointersGreedy
Roman to Integer	EASY	37.5%	Hash TableMathString
Longest Common Prefix	EASY	75%	ArrayStringTrie
3Sum	MEDIUM	50%	ArrayTwo PointersSorting
Letter Combinations of a Phone Number	MEDIUM	50%	Hash TableStringBacktracking
4Sum	MEDIUM	37.5%	ArrayTwo PointersSorting
Remove Nth Node From End of List	MEDIUM	50%	Linked ListTwo Pointers
Valid Parentheses	EASY	75%	StringStack
Merge Two Sorted Lists	EASY	62.5%	Linked ListRecursion
Generate Parentheses	MEDIUM	50%	StringDynamic ProgrammingBacktracking

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