Big Tech

Cisco interview questions

Grouped by topic, sorted Easy → Medium → Hard, then by LeetCode ID. Click a problem to open it on LeetCode; the chapter column links to the handbook chapter that covers it.

Problems
50
Easy
13
Medium
33
Hard
4
Mapped to chapter
35

Array

25 problems

Easy 6

1Two Sum★ also at:AmazonAMDApple Also at 47 moreByteDanceDelleBayGoogleIntelMetaMicrosoftNVIDIAQualcommAdobeAirbnbAtlassianAutodeskBloombergDelhiveryDoorDashDropboxEpic SystemsExpediaFlipkartFractal AnalyticsFreshworksIntuitJane StreetJioJPMorganJuspayLyftMeeshoMorgan StanleyOlaPayPalPaytmPhonePeRobloxSAPSplunkSpotifySwiggyTargetToastTwilioVisaVMwareWalmart Global TechYelpZoho EasyChapter
88Merge Sorted Array★ also at:AmazonAMDApple Also at 15 moreByteDanceeBayGoogleMetaMicrosoftNetflixNVIDIAQualcommAdobeAtlassianBloombergLyftPayPalSwiggyVMware EasyChapter
136Single Number★ also at:AmazonGoogleMeta Also at 5 moreQualcommAdobeAirbnbBloombergPalantir EasyChapter
283Move Zeroesalso at:AmazonAMDeBay Also at 13 moreGoogleMetaMicrosoftQualcommTeslaAdobeBloombergCrowdStrikeIntuitLyftPayPalSAPZomato EasyChapter
605Can Place Flowersalso at:AmazonGoogleMeta Also at 3 moreAirbnbAtlassianLinkedIn Easy—
1380Lucky Numbers in a MatrixEasy—

Medium 18

33Search in Rotated Sorted Array★ also at:AmazonByteDanceeBay Also at 20 moreGoogleMetaMicrosoftNetflixAdobeArista NetworksAutodeskBloombergFlipkartFreshworksGoldman SachsLinkedInMongoDBMyntraNaviPayPalPaytmSAPVMwareZscaler MediumChapter
46Permutationsalso at:AmazonByteDanceeBay Also at 12 moreGoogleMetaMicrosoftQualcommAdobeArista NetworksBloombergCitadelEpic SystemsGrowwVMwareZomato MediumChapter
48Rotate Image★ also at:AmazonAppleGoogle Also at 17 moreIntelMetaMicrosoftNetflixQualcommAdobeBloombergDiscordFlipkartJPMorganLyftPayPalRakutenRobloxSamsaraVisaZoho MediumChapter
49Group Anagramsalso at:AmazonAppleDell Also at 36 moreeBayGoogleMetaMicrosoftNVIDIATeslaAdobeAtlassianAutodeskBloombergCitadelDocuSignDoorDashExpediaFreshworksGoldman SachsIntuitJioJPMorganMorgan StanleyMyntraNianticOktaPayPalPhonePeSalesforceSAPSnapTargetToastTwilioVMwareWalmart Global TechWayfairYelpZoho MediumChapter
53Maximum Subarrayalso at:AmazonAppleByteDance Also at 29 moreDelleBayGoogleIntelMetaMicrosoftTeslaAdobeAirbnbArista NetworksAtlassianAutodeskBloombergFractal AnalyticsFreshworksGoldman SachsJioLinkedInMeeshoOlaPayPalPhonePeSAPSnapSwiggyTargetVisaZomatoZoom MediumChapter
54Spiral Matrixalso at:AmazonAMDApple Also at 21 moreByteDanceeBayGoogleMetaMicrosoftNetflixAdobeAutodeskBloombergCapital OneDatabricksDelhiveryEpic SystemsFlipkartIntuitMorgan StanleyOYOPayPalPhonePeRobloxZoho MediumChapter
55Jump Game★ also at:AmazonByteDanceGoogle Also at 12 moreMetaMicrosoftAdobeBloombergDoorDashMeeshoMorgan StanleyPayPalPhonePeUrban CompanyVMwareZoho MediumChapter
75Sort Colorsalso at:AmazoneBayGoogle Also at 18 moreMetaMicrosoftNVIDIAAutodeskBloombergCars24DelhiveryFlipkartGrowwInfo Edge (Naukri)Morgan StanleyOlaPayPalPhonePeSwiggyTargetVMwareWalmart Global Tech MediumChapter
79Word Search★ also at:AmazonByteDanceGoogle Also at 17 moreMetaMicrosoftNetflixAdobeArista NetworksAtlassianBloombergCitadelEpic SystemsFreshworksLyftMorgan StanleyPayPalPaytmSnapUberVMware MediumChapter
253Meeting Rooms IIalso at:AmazonAppleeBay Also at 15 moreGoogleMetaMicrosoftNetflixAtlassianBloombergDocuSignFreshworksJPMorganLINELyftMorgan StanleySnapTwo SigmaUber MediumChapter
287Find the Duplicate Numberalso at:AmazoneBayGoogle Also at 9 moreMetaMicrosoftNVIDIAAdobeBloombergCitadelFlipkartNianticVMware MediumChapter
380Insert Delete GetRandom O(1)also at:AmazonAppleGoogle Also at 20 moreMicrosoftNetflixAdobeBloombergCars24CitadelDocuSignDoorDashIntuitLinkedInOktaOYORobloxSamsaraSnapTwilioUberVMwareX (Twitter)Yelp MediumChapter
486Predict the WinnerMedium—
498Diagonal Traversealso at:AmazoneBayGoogle Also at 4 moreMetaMicrosoftNykaaSplunk Medium—
809Expressive WordsMedium—
3047Find the Largest Area of Square Inside Two Rectanglesalso at:GoogleMetaMicrosoft Also at 1 moreBloomberg Medium—
3508Implement RouterMedium—
3607Power Grid MaintenanceMedium—

Hard 1

239Sliding Window Maximum★ also at:AmazonByteDanceGoogle Also at 20 moreMetaMicrosoftNVIDIAAdobeAutodeskBloombergCitadelDeliverooDoorDashExpediaJPMorganJuspayLINELyftMongoDBOYOPhonePeRobloxVMwareWayfair HardChapter

Hash Table

9 problems

Easy 3

141Linked List Cycle★ also at:AmazoneBayGoogle Also at 11 moreMetaMicrosoftQualcommAdobeAutodeskBloombergCars24CoinDCXGrowwSAPVMware EasyChapter
202Happy Numberalso at:AmazoneBayGoogle Also at 9 moreMetaMicrosoftAdobeAirbnbBloombergPayPalSnowflakeSwiggyX (Twitter) EasyChapter
653Two Sum IV - Input is a BSTalso at:AmazonGoogleMicrosoft Easy—

Medium 5

3Longest Substring Without Repeating Charactersalso at:AmazonAMDApple Also at 45 moreByteDanceDelleBayGoogleIntelMetaMicrosoftNetflixNVIDIAQualcommTeslaAdobeAirtelArista NetworksAtlassianBloombergDocuSignDream11DuolingoFlipkartFractal AnalyticsFreshworksIntuitJPMorganJuspayLinkedInMorgan StanleyMyntraPayPalPaytmRakutenRipplingRobloxSalesforceSAPSpotifySwiggyToastUrban CompanyVisaVMwareYelpZohoZomatoZoom MediumChapter
17Letter Combinations of a Phone Number★ also at:AmazonAppleeBay Also at 15 moreGoogleMetaMicrosoftTeslaBloombergChimeCitadelDeliverooDropboxEpic SystemsLinkedInLyftPhonePeTwilioVMware MediumChapter
146LRU Cache★ also at:AmazonAMDApple Also at 59 moreByteDanceeBayGoogleIntelMetaMicrosoftNetflixNVIDIAQualcommTeslaAdobeArista NetworksAutodeskBloombergCitadelCloudflareCREDDelhiveryDocuSignDoorDashExpediaFlipkartGrowwIntuitJane StreetJPMorganLINELinkedInLyftMongoDBMorgan StanleyMyntraNianticNykaaOktaOlaPalantirPayPalPhonePeRakutenRazorpayRedditRipplingSalesforceSAPSnapSnowflakeSplunkSpotifySwiggyTargetToastTwilioUberVisaVMwareX (Twitter)ZoomZscaler MediumChapter
567Permutation in Stringalso at:AmazonAppleGoogle Also at 5 moreMicrosoftBloombergLyftRevolutWalmart Global Tech MediumChapter
1443Minimum Time to Collect All Apples in a Treealso at:Myntra Medium—

Hard 1

76Minimum Window Substringalso at:AmazonByteDanceeBay Also at 16 moreGoogleMetaMicrosoftAdobeAirbnbBloombergDeliverooGoldman SachsInMobiLinkedInLyftMeeshoSAPSnapSwiggyVMware HardChapter

String

7 problems

Easy 3

1047Remove All Adjacent Duplicates In Stringalso at:AmazonGoogleMeta Also at 2 moreBloombergPaytm Easy—
1784Check if Binary String Has at Most One Segment of Onesalso at:AmazonGoogle Easy—
2047Number of Valid Words in a SentenceEasy—

Medium 3

72Edit Distance★ also at:AmazonAppleByteDance Also at 13 moreGoogleMetaMicrosoftQualcommAdobeArista NetworksBloombergFlipkartNaviSnapSwiggyVMwareZoho MediumChapter
394Decode Stringalso at:AmazonByteDanceeBay Also at 11 moreGoogleMicrosoftArista NetworksBloombergIntuitOlaPhonePeRazorpayVMwareYelpZoho MediumChapter
1143Longest Common Subsequence★ also at:AmazonByteDanceGoogle Also at 6 moreMetaMicrosoftCitadelCure.fitDoorDashMorgan Stanley MediumChapter

Hard 1

642Design Search Autocomplete Systemalso at:GoogleBloombergCitadel Also at 4 moreLyftMongoDBPinterestRoblox HardChapter

Math

3 problems

Medium 2

50Pow(x, n)★ also at:AmazoneBayGoogle Also at 7 moreMetaMicrosoftQualcommAdobeBloombergCitadelVMware MediumChapter
3648Minimum Sensors to Cover GridMedium—

Hard 1

2081Sum of k-Mirror NumbersHard—

Misc

6 problems

Easy 1

1290Convert Binary Number in a Linked List to Integeralso at:Roblox EasyChapter

Medium 5

2Add Two Numbersalso at:AmazonAppleByteDance Also at 12 moreeBayGoogleMetaMicrosoftAdobeAirbnbBloombergDoorDashJane StreetLyftSAPVMware MediumChapter
5Longest Palindromic Substring★ also at:AmazonAppleeBay Also at 26 moreGoogleMetaMicrosoftNVIDIATeslaAdobeArista NetworksAutodeskBloombergDoorDashDuolingoEpic SystemsFlipkartFractal AnalyticsInfo Edge (Naukri)Morgan StanleyPalantirPayPalPaytmPhonePeSAPSwiggyUberVisaVMwareWalmart Global Tech MediumChapter
230Kth Smallest Element in a BSTalso at:GoogleMetaMicrosoft Also at 3 moreBloombergUberVMware MediumChapter
236Lowest Common Ancestor of a Binary Tree★ also at:AmazonByteDanceeBay Also at 12 moreGoogleIntelMetaMicrosoftAdobeAtlassianBloombergFreshworksIntuitMongoDBSAPSplunk MediumChapter
647Palindromic Substringsalso at:AmazonMetaMicrosoft Also at 7 moreAdobeArista NetworksCapital OneCitadelEpic SystemsPayPalVMware MediumChapter