Fintech

PayPal 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
9
Medium
34
Hard
7
Mapped to chapter
26

Array

33 problems

Easy 5

88Merge Sorted Array★ also at:AdobeAmazonAMD Also at 15 moreAppleAtlassianBloombergByteDanceCiscoeBayGoogleLyftMetaMicrosoftNetflixNVIDIAQualcommSwiggyVMware EasyChapter
121Best Time to Buy and Sell Stockalso at:CoinbaseIntuitRobinhood Also at 39 moreVisaAdobeAirtelAmazonAppleAtlassianBloombergByteDanceCiscoCitadelFlipkartGoldman SachsGoogleGrowwInstacartJioJPMorganLyftMetaMicrosoftMorgan StanleyMyntraNetflixNVIDIAOlaPhonePeRakutenSAPSnapSwiggyTargetTeslaTiger AnalyticsToastTwo SigmaUberVMwareWalmart Global TechZoho Easy—
697Degree of an Arrayalso at:VMware Easy—
1160Find Words That Can Be Formed by Charactersalso at:Atlassian Easy—
2586Count the Number of Vowel Strings in RangeEasy—

Medium 24

11Container With Most Water★ also at:AdobeAirtelAmazon Also at 24 moreAppleAtlassianBloombergByteDanceCitadelDream11FlipkartFreshworksGoldman SachsGoogleGrowwIntelLyftMetaMicrosoftMyntraOktaOYOPaytmQualcommRazorpaySAPTeslaVMware MediumChapter
153Sumalso at:IntuitVisaAdobe Also at 31 moreAmazonAMDAppleAtlassianAutodeskBloombergByteDanceCiscoCitadelCloudflareDream11eBayFlipkartGoldman SachsGoogleMeeshoMetaMicrosoftMorgan StanleyMyntraNVIDIAPaytmPhonePeQualcommSplunkTeslaVMwareWalmart Global TechZohoZomatoZoom MediumChapter
39Combination Sumalso at:ChimeAirbnbAmazon Also at 10 moreBloombergCitadeleBayGoogleMetaNianticSamsaraSnapVMwareZomato MediumChapter
48Rotate Image★ also at:VisaAdobeAmazon Also at 17 moreAppleBloombergCiscoDiscordFlipkartGoogleIntelJPMorganLyftMetaMicrosoftNetflixQualcommRakutenRobloxSamsaraZoho MediumChapter
49Group Anagramsalso at:IntuitAdobeAmazon Also at 36 moreAppleAtlassianAutodeskBloombergCiscoCitadelDellDocuSignDoorDasheBayExpediaFreshworksGoldman SachsGoogleJioJPMorganMetaMicrosoftMorgan StanleyMyntraNianticNVIDIAOktaPhonePeSalesforceSAPSnapTargetTeslaToastTwilioVMwareWalmart Global TechWayfairYelpZoho MediumChapter
54Spiral Matrixalso at:IntuitAdobeAmazon Also at 21 moreAMDAppleAutodeskBloombergByteDanceCapital OneCiscoDatabricksDelhiveryeBayEpic SystemsFlipkartGoogleMetaMicrosoftMorgan StanleyNetflixOYOPhonePeRobloxZoho MediumChapter
56Merge Intervalsalso at:VisaAdobeAirtel Also at 46 moreAmazonAMDAppleAtlassianAutodeskBloombergByteDanceCars24CiscoCitadelCrowdStrikeDatabricksDocuSignDoorDashDropboxeBayExpediaFlipkartGoldman SachsGoogleInstacartJuspayMetaMicrosoftMorgan StanleyNetflixOktaOYOPalantirPhonePeQualcommRazorpayRipplingRobloxSAPSnapTargetTeslaToastUberVMwareWalmart Global TechX (Twitter)YelpZohoZomato MediumChapter
73Set Matrix Zeroesalso at:AdobeAmazonAutodesk Also at 7 moreBloombergGoogleJuspayMetaMicrosoftNykaaZscaler MediumChapter
78Subsets★ also at:ChimeAdobeAmazon Also at 8 moreBloombergByteDanceeBayFlipkartGoogleLyftMetaMicrosoft MediumChapter
79Word Search★ also at:AdobeAmazonArista Networks Also at 17 moreAtlassianBloombergByteDanceCiscoCitadelEpic SystemsFreshworksGoogleLyftMetaMicrosoftMorgan StanleyNetflixPaytmSnapUberVMware MediumChapter
162Find Peak Elementalso at:AmazonBloombergByteDance Also at 14 moreDatabricksDocuSignFlipkartFreshworksGoogleGrowwLyftMetaMicrosoftRedditSnapUberUrban CompanyVMware MediumChapter
198House Robber★ also at:IntuitAdobeAirbnb Also at 24 moreAmazonBloombergByteDanceCars24CiscoCitadelCleartripCure.fitDatabricksDatadogeBayExpediaFlipkartGoogleMetaMicrosoftNianticNVIDIAOYOPhonePeSamsaraTeslaWalmart Global TechZoom MediumChapter
215Kth Largest Element in an Array★ also at:IntuitAdobeAmazon Also at 17 moreAppleAutodeskBloombergByteDanceDeliverooeBayFlipkartFreshworksGoogleLinkedInMetaMicrosoftMorgan StanleyQualcommSAPSpotifyVMware MediumChapter
300Longest Increasing Subsequence★ also at:IntuitAdobeAmazon Also at 12 moreAtlassianBloombergCitadeleBayFreshworksGoogleLINEMetaMicrosoftMorgan StanleyNVIDIAVMware MediumChapter
322Coin Change★ also at:IntuitAdobeAmazon Also at 18 moreAtlassianBloombergByteDanceCleartripDatadogDeliverooeBayFractal AnalyticsGoogleMetaMicrosoftMorgan StanleyNetflixNianticPhonePePinterestSAPVMware MediumChapter
851Loud and Richalso at:PhonePe Medium—
994Rotting Oranges★ also at:ChimeIntuitAdobe Also at 23 moreAmazonBloombergCitadelCleartripDoorDashDream11eBayFlipkartGoogleLinkedInMetaMicrosoftMyntraOpenAIOYOPhonePeRakutenRobloxSalesforceUberUrban CompanyZohoZoom MediumChapter
1048Longest String Chainalso at:AtlassianCitadelGoogle Also at 3 moreSnapTwo SigmaVMware Medium—
1060Missing Element in Sorted Arrayalso at:Lyft Medium—
1202Smallest String With Swapsalso at:ByteDanceMicrosoftPalantir Also at 1 morePhonePe Medium—
1283Find the Smallest Divisor Given a Thresholdalso at:AmazonByteDanceExpedia Also at 2 moreGoogleZscaler Medium—
1353Maximum Number of Events That Can Be Attendedalso at:AmazonInstacartMicrosoft Also at 2 moreSnowflakeZoho Medium—
1589Maximum Sum Obtained of Any PermutationMedium—
2554Maximum Number of Integers to Choose From a Range IMedium—

Hard 4

123Best Time to Buy and Sell Stock IIIalso at:AmazonBloombergCitadel Also at 4 moreGoogleGrowwMetaSnap Hard—
1671Minimum Number of Removals to Make Mountain ArrayHardChapter
2183Count Array Pairs Divisible by Kalso at:Qualcomm Hard—
2366Minimum Replacements to Sort the Arrayalso at:Zscaler Hard—

Two Pointers

5 problems

Easy 1

2697Lexicographically Smallest PalindromeEasy—

Medium 3

5Longest Palindromic Substring★ also at:VisaAdobeAmazon Also at 26 moreAppleArista NetworksAutodeskBloombergCiscoDoorDashDuolingoeBayEpic SystemsFlipkartFractal AnalyticsGoogleInfo Edge (Naukri)MetaMicrosoftMorgan StanleyNVIDIAPalantirPaytmPhonePeSAPSwiggyTeslaUberVMwareWalmart Global Tech MediumChapter
647Palindromic Substringsalso at:AdobeAmazonArista Networks Also at 7 moreCapital OneCiscoCitadelEpic SystemsMetaMicrosoftVMware MediumChapter
1963Minimum Number of Swaps to Make the String Balancedalso at:VisaMicrosoft Medium—

Hard 1

295Find Median from Data Streamalso at:WiseAdobeAmazon Also at 16 moreAppleByteDanceCitadelDocuSigneBayFlipkartGoogleInMobiMeeshoMicrosoftNaviOktaOlaOYOUberVMware HardChapter

String

3 problems

Medium 3

6Zigzag Conversionalso at:IntuitAdobeAmazon Also at 7 moreBloombergCleartripGoogleMetaMicrosoftSalesforceZoho Medium—
1209Remove All Adjacent Duplicates in String IIalso at:AmazonBloombergGoldman Sachs Also at 3 moreMicrosoftMorgan StanleyVMware Medium—
2380Time Needed to Rearrange a Binary Stringalso at:SalesforceWayfair Medium—

Misc

9 problems

Easy 3

70Climbing Stairs★ also at:IntuitAdobeAmazon Also at 12 moreAMDBloombergCitadelFractal AnalyticsGoogleJioMetaMicrosoftQualcommRakutenTiger AnalyticsZoho EasyChapter
387First Unique Character in a Stringalso at:WiseAdobeAmazon Also at 6 moreBloombergGoldman SachsGoogleMicrosoftMorgan StanleyRazorpay Easy—
1251Average Selling Pricealso at:AmazonGoogleMicrosoft Easy—

Medium 4

3Longest Substring Without Repeating Charactersalso at:IntuitVisaAdobe Also at 45 moreAirtelAmazonAMDAppleArista NetworksAtlassianBloombergByteDanceCiscoDellDocuSignDream11DuolingoeBayFlipkartFractal AnalyticsFreshworksGoogleIntelJPMorganJuspayLinkedInMetaMicrosoftMorgan StanleyMyntraNetflixNVIDIAPaytmQualcommRakutenRipplingRobloxSalesforceSAPSpotifySwiggyTeslaToastUrban CompanyVMwareYelpZohoZomatoZoom MediumChapter
24Swap Nodes in Pairsalso at:AdobeAmazonArista Networks Also at 6 moreeBayGoogleLyftMetaMicrosoftQualcomm MediumChapter
207Course Schedule★ also at:IntuitAmazonApple Also at 22 moreByteDanceCars24CitadelCloudflareCrowdStrikeDoorDasheBayFlipkartGoogleMetaMicrosoftRobloxSalesforceSnapSnowflakeSwiggyTargetToastUberWalmart Global TechYelpZomato MediumChapter
2625Flatten Deeply Nested ArrayMedium—

Hard 2

124Binary Tree Maximum Path Sumalso at:IntuitAdobeAmazon Also at 12 moreBloombergByteDanceCitadelDatadogDoorDashFlipkartGoogleMetaMicrosoftSnapUrban CompanyVMware HardChapter
780Reaching Pointsalso at:CloudflareWayfair Hard—