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Qualcomm LeetCode Questions 2026

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

Last updated: 20 Feb 2026

Timeframe

Difficulty

Problem	Difficulty	Frequency	Topics
Palindrome Number	EASY	50%	Math
Valid Parentheses	EASY	75%	StringStack
Swap Nodes in Pairs	MEDIUM	62.5%	Linked ListRecursion
Rotate Image	MEDIUM	75%	ArrayMathMatrix
Climbing Stairs	EASY	62.5%	MathDynamic ProgrammingMemoization
Maximum Number of Ones	HARD	100%	MathGreedySortingHeap (Priority Queue)
LRU Cache	MEDIUM	62.5%	Hash TableLinked ListDesignDoubly-Linked List
Number of 1 Bits	EASY	50%	Divide and ConquerBit Manipulation
Reverse Linked List	EASY	87.5%	Linked ListRecursion
Power of Two	EASY	75%	MathBit ManipulationRecursion
String Compression III	MEDIUM	100%	String
Serialize and Deserialize Binary Tree	HARD	50%	StringTreeDepth-First SearchBreadth-First SearchDesignBinary Tree
Design Memory Allocator	MEDIUM	50%	ArrayHash TableDesignSimulation
Middle of the Linked List	EASY	75%	Linked ListTwo Pointers
Reverse Bits	EASY	75%	Divide and ConquerBit Manipulation
Length of Last Word	EASY	50%	String
Remove Duplicates from Sorted Array	EASY	50%	ArrayTwo Pointers
Number of Islands	MEDIUM	75%	ArrayDepth-First SearchBreadth-First SearchUnion-FindMatrix
Implement Queue using Stacks	EASY	62.5%	StackDesignQueue
Trapping Rain Water II	HARD	50%	ArrayBreadth-First SearchHeap (Priority Queue)Matrix

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