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Intel LeetCode Questions 2026

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

Last updated: 20 Feb 2026

Timeframe

Difficulty

Problem	Difficulty	Frequency	Topics
Two Sum	EASY	100%	ArrayHash Table
Longest Substring Without Repeating Characters	MEDIUM	75%	Hash TableStringSliding Window
Valid Parentheses	EASY	87.5%	StringStack
Reverse Integer	MEDIUM	62.5%	Math
Trapping Rain Water	HARD	87.5%	ArrayTwo PointersDynamic ProgrammingStackMonotonic Stack
Copy List with Random Pointer	MEDIUM	87.5%	Hash TableLinked List
Reverse Words in a String	MEDIUM	62.5%	Two PointersString
Number of Islands	MEDIUM	87.5%	ArrayDepth-First SearchBreadth-First SearchUnion-FindMatrix
Count Primes	MEDIUM	75%	ArrayMathEnumerationNumber Theory
Find Consecutive Integers from a Data Stream	MEDIUM	100%	Hash TableDesignQueueCountingData Stream
Maximum Nesting Depth of the Parentheses	EASY	100%	StringStack
Merge Two Sorted Lists	EASY	62.5%	Linked ListRecursion
LRU Cache	MEDIUM	75%	Hash TableLinked ListDesignDoubly-Linked List
Palindrome Number	EASY	75%	Math
Container With Most Water	MEDIUM	62.5%	ArrayTwo PointersGreedy
Merge Sorted Array	EASY	62.5%	ArrayTwo PointersSorting
Rotate Image	MEDIUM	62.5%	ArrayMathMatrix
Valid Palindrome	EASY	62.5%	Two PointersString
Maximum Subarray	MEDIUM	62.5%	ArrayDivide and ConquerDynamic Programming
Top K Frequent Words	MEDIUM	62.5%	ArrayHash TableStringTrieSortingHeap (Priority Queue)Bucket SortCounting

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