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Cisco LeetCode Questions 2026

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

Last updated: 10 July 2026

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Timeframe

Difficulty

Problem	Difficulty	Frequency	Topics
Two Sum	EASY	50%	ArrayHash Table
Add Two Numbers	MEDIUM	62.5%	Linked ListMathRecursion
Longest Substring Without Repeating Characters	MEDIUM	62.5%	Hash TableStringSliding Window
Longest Palindromic Substring	MEDIUM	100%	Two PointersStringDynamic Programming
3Sum	MEDIUM	37.5%	ArrayTwo PointersSorting
Valid Parentheses	EASY	62.5%	StringStack
Rotate Image	MEDIUM	87.5%	ArrayMathMatrix
Maximum Subarray	MEDIUM	62.5%	ArrayDivide and ConquerDynamic Programming
Spiral Matrix	MEDIUM	75%	ArrayMatrixSimulation
Merge Intervals	MEDIUM	50%	ArraySorting
Merge Sorted Array	EASY	37.5%	ArrayTwo PointersSorting
Maximum Difference Between Increasing Elements	EASY	62.5%	Array
Best Time to Buy and Sell Stock	EASY	37.5%	ArrayDynamic Programming
Number of Valid Words in a Sentence	EASY	75%	String
Linked List Cycle	EASY	50%	Hash TableLinked ListTwo Pointers
LRU Cache	MEDIUM	62.5%	Hash TableLinked ListDesignDoubly-Linked List
Max Points on a Line	HARD	50%	ArrayHash TableMathGeometry
Sum of k-Mirror Numbers	HARD	75%	MathEnumeration
Number of Equal Count Substrings	MEDIUM	62.5%	Hash TableStringSliding WindowCounting
House Robber	MEDIUM	100%	ArrayDynamic Programming

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