EdTech

Duolingo 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
17
Easy
8
Medium
7
Hard
2
Mapped to chapter
8

Array

9 problems

Easy 4

35Search Insert Positionalso at:AdobeAmazonBloomberg Also at 4 moreGoogleInstacartMetaMicrosoft EasyChapter
733Flood Fillalso at:AmazonAppleGoogle Also at 3 moreMetaMicrosoftVMware EasyChapter
977Squares of a Sorted Arrayalso at:AdobeAmazonBloomberg Also at 11 moreByteDanceCrowdStrikeeBayGoogleInstacartMetaMicrosoftSplunkUberVMwareWise Easy—
1710Maximum Units on a Truckalso at:Arista NetworksJPMorganMicrosoft Easy—

Medium 3

1733Minimum Number of People to TeachMedium—
2090K Radius Subarray AveragesMedium—
2365Task Scheduler IIMedium—

Hard 2

329Longest Increasing Path in a Matrixalso at:AdobeAmazonApple Also at 9 moreByteDanceCitadelDoorDashEpic SystemsGoogleMetaMicrosoftPhonePeSnap HardChapter
2227Encrypt and Decrypt StringsHardChapter

Hash Table

3 problems

Easy 1

242Valid Anagramalso at:AmazonAtlassianBloomberg Also at 6 moreGoogleMetaMicrosoftPayPalTeslaYelp EasyChapter

Medium 2

3Longest Substring Without Repeating Charactersalso at:AdobeAirtelAmazon Also at 45 moreAMDAppleArista NetworksAtlassianBloombergByteDanceCiscoDellDocuSignDream11eBayFlipkartFractal AnalyticsFreshworksGoogleIntelIntuitJPMorganJuspayLinkedInMetaMicrosoftMorgan StanleyMyntraNetflixNVIDIAPayPalPaytmQualcommRakutenRipplingRobloxSalesforceSAPSpotifySwiggyTeslaToastUrban CompanyVisaVMwareYelpZohoZomatoZoom MediumChapter
767Reorganize Stringalso at:AmazonCitadelDiscord Also at 7 moreeBayGoogleIntuitMicrosoftRobloxTeslaZoho MediumChapter

Misc

5 problems

Easy 3

270Closest Binary Search Tree Valuealso at:Fractal AnalyticsMetaRakuten Also at 2 moreSnapWise Easy—
408Valid Word Abbreviationalso at:DatadogMetaZoom Easy—
938Range Sum of BSTalso at:Meta Easy—

Medium 2

5Longest Palindromic Substring★ also at:AdobeAmazonApple Also at 26 moreArista NetworksAutodeskBloombergCiscoDoorDasheBayEpic SystemsFlipkartFractal AnalyticsGoogleInfo Edge (Naukri)MetaMicrosoftMorgan StanleyNVIDIAPalantirPayPalPaytmPhonePeSAPSwiggyTeslaUberVisaVMwareWalmart Global Tech MediumChapter
366Find Leaves of Binary Treealso at:DiscordeBayFlipkart Also at 1 moreLinkedIn Medium—