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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: 20 May 2026

ProblemDifficultyFrequencyTopics
Two SumEASY
50%
ArrayHash Table
Add Two NumbersMEDIUM
62.5%
Linked ListMathRecursion
Longest Substring Without Repeating CharactersMEDIUM
62.5%
Hash TableStringSliding Window
Longest Palindromic SubstringMEDIUM
100%
Two PointersStringDynamic Programming
3SumMEDIUM
50%
ArrayTwo PointersSorting
Valid ParenthesesEASY
62.5%
StringStack
Merge k Sorted ListsHARD
37.5%
Linked ListDivide and ConquerHeap (Priority Queue)Merge Sort
Rotate ImageMEDIUM
87.5%
ArrayMathMatrix
Maximum SubarrayMEDIUM
75%
ArrayDivide and ConquerDynamic Programming
Spiral MatrixMEDIUM
87.5%
ArrayMatrixSimulation
Merge IntervalsMEDIUM
62.5%
ArraySorting
Merge Sorted ArrayEASY
50%
ArrayTwo PointersSorting
Maximum Difference Between Increasing ElementsEASY
62.5%
Array
Best Time to Buy and Sell StockEASY
50%
ArrayDynamic Programming
Number of Valid Words in a SentenceEASY
75%
String
Linked List CycleEASY
50%
Hash TableLinked ListTwo Pointers
LRU CacheMEDIUM
62.5%
Hash TableLinked ListDesignDoubly-Linked List
Max Points on a LineHARD
50%
ArrayHash TableMathGeometry
Sum of k-Mirror NumbersHARD
75%
MathEnumeration
Number of Equal Count SubstringsMEDIUM
75%
Hash TableStringSliding WindowCounting

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