Big Tech

Apple 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
8
Medium
36
Hard
6
Mapped to chapter
34

Array

23 problems

Easy 5

1Two Sum★ also at:AmazonAMDByteDance Also at 47 moreCiscoDelleBayGoogleIntelMetaMicrosoftNVIDIAQualcommAdobeAirbnbAtlassianAutodeskBloombergDelhiveryDoorDashDropboxEpic SystemsExpediaFlipkartFractal AnalyticsFreshworksIntuitJane StreetJioJPMorganJuspayLyftMeeshoMorgan StanleyOlaPayPalPaytmPhonePeRobloxSAPSplunkSpotifySwiggyTargetToastTwilioVisaVMwareWalmart Global TechYelpZoho EasyChapter
14Longest Common Prefixalso at:AmazoneBayGoogle Also at 15 moreMetaMicrosoftQualcommAdobeBloombergFractal AnalyticsJane StreetPhonePeRevolutRobloxSAPSplunkTargetTwilioYelp EasyChapter
88Merge Sorted Array★ also at:AmazonAMDByteDance Also at 15 moreCiscoeBayGoogleMetaMicrosoftNetflixNVIDIAQualcommAdobeAtlassianBloombergLyftPayPalSwiggyVMware EasyChapter
217Contains Duplicatealso at:AmazonGoogleMeta Also at 6 moreMicrosoftNetflixAdobeAirbnbBloombergPalantir EasyChapter
252Meeting Roomsalso at:AmazonFreshworks EasyChapter

Medium 16

11Container With Most Water★ also at:AmazonByteDanceGoogle Also at 24 moreIntelMetaMicrosoftQualcommTeslaAdobeAirtelAtlassianBloombergCitadelDream11FlipkartFreshworksGoldman SachsGrowwLyftMyntraOktaOYOPayPalPaytmRazorpaySAPVMware MediumChapter
184Sumalso at:AmazonGoogleMeta Also at 6 moreMicrosoftAdobeBloombergCloudflareDoorDashOYO Medium—
36Valid Sudokualso at:AmazonGoogleMeta Also at 10 moreMicrosoftAdobeAutodeskBloombergInstacartPayPalSamsaraSnapVMwareZoho MediumChapter
48Rotate Image★ also at:AmazonCiscoGoogle Also at 17 moreIntelMetaMicrosoftNetflixQualcommAdobeBloombergDiscordFlipkartJPMorganLyftPayPalRakutenRobloxSamsaraVisaZoho MediumChapter
49Group Anagramsalso at:AmazonCiscoDell Also at 36 moreeBayGoogleMetaMicrosoftNVIDIATeslaAdobeAtlassianAutodeskBloombergCitadelDocuSignDoorDashExpediaFreshworksGoldman SachsIntuitJioJPMorganMorgan StanleyMyntraNianticOktaPayPalPhonePeSalesforceSAPSnapTargetToastTwilioVMwareWalmart Global TechWayfairYelpZoho MediumChapter
53Maximum Subarrayalso at:AmazonByteDanceCisco Also at 29 moreDelleBayGoogleIntelMetaMicrosoftTeslaAdobeAirbnbArista NetworksAtlassianAutodeskBloombergFractal AnalyticsFreshworksGoldman SachsJioLinkedInMeeshoOlaPayPalPhonePeSAPSnapSwiggyTargetVisaZomatoZoom MediumChapter
56Merge Intervalsalso at:AmazonAMDByteDance Also at 46 moreCiscoeBayGoogleMetaMicrosoftNetflixQualcommTeslaAdobeAirtelAtlassianAutodeskBloombergCars24CitadelCrowdStrikeDatabricksDocuSignDoorDashDropboxExpediaFlipkartGoldman SachsInstacartJuspayMorgan StanleyOktaOYOPalantirPayPalPhonePeRazorpayRipplingRobloxSAPSnapTargetToastUberVisaVMwareWalmart Global TechX (Twitter)YelpZohoZomato MediumChapter
122Best Time to Buy and Sell Stock IIalso at:AmazonGoogleMeta Also at 7 moreMicrosoftAdobeCitadelGrowwNaviPaytmToast Medium—
128Longest Consecutive Sequence★ also at:AmazonCiscoGoogle Also at 17 moreMetaMicrosoftNVIDIAAdobeAtlassianBloombergChimeMyntraOktaPayPalPaytmPhonePeRakutenRobloxSpotifySwiggyUber MediumChapter
253Meeting Rooms IIalso at:AmazonCiscoeBay Also at 15 moreGoogleMetaMicrosoftNetflixAtlassianBloombergDocuSignFreshworksJPMorganLINELyftMorgan StanleySnapTwo SigmaUber MediumChapter
309Best Time to Buy and Sell Stock with Cooldownalso at:GoogleBloomberg Medium—
362Design Hit Counter★ also at:GoogleMetaAtlassian Also at 9 moreBloombergCloudflareDatabricksDeliverooDropboxOpenAIRedditRobloxUber MediumChapter
380Insert Delete GetRandom O(1)also at:AmazonCiscoGoogle Also at 20 moreMicrosoftNetflixAdobeBloombergCars24CitadelDocuSignDoorDashIntuitLinkedInOktaOYORobloxSamsaraSnapTwilioUberVMwareX (Twitter)Yelp MediumChapter
621Task Scheduler★ also at:AmazonGoogleMicrosoft Also at 5 moreDocuSignIntuitOktaRobloxVMware MediumChapter
918Maximum Sum Circular Subarrayalso at:Two SigmaWise Medium—
1146Snapshot Array★ also at:AmazoneBayDatabricks Also at 2 moreMongoDBSnowflake MediumChapter

Hard 2

4Median of Two Sorted Arraysalso at:AmazonByteDanceeBay Also at 18 moreGoogleMetaMicrosoftQualcommAdobeAutodeskBloombergCitadelDropboxFlipkartGoldman SachsIntuitOktaPayPalRipplingSnapSwiggyVMware HardChapter
329Longest Increasing Path in a Matrixalso at:AmazonByteDanceGoogle Also at 9 moreMetaMicrosoftAdobeCitadelDoorDashDuolingoEpic SystemsPhonePeSnap HardChapter

Hash Table

9 problems

Medium 8

17Letter Combinations of a Phone Number★ also at:AmazonCiscoeBay Also at 15 moreGoogleMetaMicrosoftTeslaBloombergChimeCitadelDeliverooDropboxEpic SystemsLinkedInLyftPhonePeTwilioVMware MediumChapter
146LRU Cache★ also at:AmazonAMDByteDance Also at 59 moreCiscoeBayGoogleIntelMetaMicrosoftNetflixNVIDIAQualcommTeslaAdobeArista NetworksAutodeskBloombergCitadelCloudflareCREDDelhiveryDocuSignDoorDashExpediaFlipkartGrowwIntuitJane StreetJPMorganLINELinkedInLyftMongoDBMorgan StanleyMyntraNianticNykaaOktaOlaPalantirPayPalPhonePeRakutenRazorpayRedditRipplingSalesforceSAPSnapSnowflakeSplunkSpotifySwiggyTargetToastTwilioUberVisaVMwareX (Twitter)ZoomZscaler MediumChapter
208Implement Trie (Prefix Tree)★ also at:AmazoneBayGoogle Also at 10 moreMetaMicrosoftBlockBloombergCitadelDocuSignDoorDashMongoDBRobloxX (Twitter) MediumChapter
314Binary Tree Vertical Order Traversalalso at:ByteDanceMetaAdobe Also at 5 moreBloombergDoorDashLINERedditSnap Medium—
567Permutation in Stringalso at:AmazonCiscoGoogle Also at 5 moreMicrosoftBloombergLyftRevolutWalmart Global Tech MediumChapter
635Design Log Storage Systemalso at:Snap Medium—
863All Nodes Distance K in Binary Treealso at:AmazonByteDanceGoogle Also at 4 moreMetaMicrosoftFlipkartOkta Medium—
981Time Based Key-Value Storealso at:AmazonGoogleMicrosoft Also at 14 moreNetflixAirbnbBloombergCars24CoinbaseCrowdStrikeDatabricksInstacartLyftMongoDBOpenAIPalantirUberVMware Medium—

Hard 1

127Word Ladderalso at:AmazonGoogleMeta Also at 15 moreMicrosoftBloombergDocuSignFlipkartLinkedInLyftOktaPhonePeRedditSnapSpotifyUberVMwareYelpZscaler HardChapter

Linked List

4 problems

Medium 3

2Add Two Numbersalso at:AmazonByteDanceCisco Also at 12 moreeBayGoogleMetaMicrosoftAdobeAirbnbBloombergDoorDashJane StreetLyftSAPVMware MediumChapter
19Remove Nth Node From End of Listalso at:AmazonByteDanceGoogle Also at 8 moreMetaMicrosoftQualcommAdobeInMobiLINEMorgan StanleyVMware Medium—
328Odd Even Linked Listalso at:AmazoneBayGoogle Also at 3 moreMetaMicrosoftMeesho Medium—

Hard 1

23Merge k Sorted Lists★ also at:AmazonByteDanceCisco Also at 25 moreeBayGoogleMetaMicrosoftNVIDIAQualcommAdobeAirbnbBloombergCitadelCloudflareDeliverooDocuSignDoorDashFlipkartLyftMongoDBNianticNykaaOlaPalantirRipplingTwo SigmaVMwareX (Twitter) HardChapter

Math

4 problems

Easy 1

412Fizz Buzzalso at:AmazonCiscoGoogle Also at 8 moreMetaMicrosoftNVIDIAAdobeBloombergCitadelPayPalSpotify Easy—

Medium 2

7Reverse Integeralso at:AmazonGoogleMeta Also at 5 moreMicrosoftQualcommAdobeBloombergLyft MediumChapter
227Basic Calculator IIalso at:AmazoneBayGoogle Also at 9 moreMetaTeslaAirbnbBloombergDoorDashExpediaRedditSnapUber MediumChapter

Hard 1

273Integer to English Wordsalso at:AmazonCiscoMicrosoft Also at 7 moreBlockDelhiveryFractal AnalyticsPalantirRobloxSplunkZscaler Hard—

Stack

3 problems

Easy 1

232Implement Queue using Stacksalso at:AmazonGoogleMicrosoft Also at 4 moreNetflixQualcommInMobiSAP EasyChapter

Medium 2

155Min Stack★ also at:AmazoneBayGoogle Also at 13 moreIntelMetaMicrosoftNVIDIAAdobeBloombergChimeDiscordFlipkartIntuitLyftPaytmSnap MediumChapter
341Flatten Nested List Iteratoralso at:AmazoneBayNetflix Also at 6 moreTeslaLyftOpenAISplunkVMwareX (Twitter) Medium—

Two Pointers

3 problems

Easy 1

125Valid Palindrome★ also at:AmazonCiscoeBay Also at 10 moreGoogleIntelMetaMicrosoftAdobeArista NetworksBloombergSAPToastWayfair EasyChapter

Medium 1

151Reverse Words in a Stringalso at:AmazonCiscoGoogle Also at 11 moreIntelMetaMicrosoftBloombergChimeDeliverooNykaaPaytmSnapVMwareYelp Medium—

Hard 1

295Find Median from Data Streamalso at:AmazonByteDanceeBay Also at 16 moreGoogleMicrosoftAdobeCitadelDocuSignFlipkartInMobiMeeshoNaviOktaOlaOYOPayPalUberVMwareWise HardChapter

Misc

4 problems

Medium 4

72Edit Distance★ also at:AmazonByteDanceCisco Also at 13 moreGoogleMetaMicrosoftQualcommAdobeArista NetworksBloombergFlipkartNaviSnapSwiggyVMwareZoho MediumChapter
787Cheapest Flights Within K Stops★ also at:AmazoneBayGoogle Also at 8 moreMicrosoftAirbnbBloombergFlipkartInMobiSnapStripeUber MediumChapter
1197Minimum Knight Movesalso at:CitadelUber Medium—
2633Convert Object to JSON Stringalso at:Google Medium—