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All Topics Algorithms Backend
Design Concurrency Database Database
Design Java Javascript Object Oriented
Design Programming
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Title	Difficulty	Companies
Shuffle an Array	Medium	amazon apple bloomberg cisco facebook google linkedin microsoft salesforce tripadvisor two-sigma yahoo
Sort Array By Parity	Easy	amazon apple cisco facebook google microsoft oracle vmware
Delete in a Binary Search Tree	Medium	amazon apple bloomberg cisco facebook google linkedin microsoft oracle uber yahoo
Convert Binary Number in a Linked List to Integer	Easy	cisco roblox servicenow
Reverse Integer	Medium	adobe amazon apple barclays bloomberg cisco facebook google jpmorgan lyft microsoft netease oracle uber yahoo
Balanced Binary Tree	Easy	adobe amazon apple bloomberg bytedance cisco facebook google microsoft paypal
Different Ways to Add Parentheses	Medium	amazon cisco citadel facebook google
Least Number of Perfect Squares that Sums to n	Medium	adobe amazon apple cisco ebay facebook godaddy google grammarly linkedin lyft microsoft uber yandex
Merge K Sorted Lists	Hard	adobe airbnb alibaba amazon apple atlassian audible bloomberg box bytedance cisco cohesity cruise-automation ebay facebook goldman-sachs google indeed ixl linkedin lyft mathworks microsoft nvidia oracle salesforce sap tableau twitter uber vmware wish yahoo yandex zillow
Rotate n x n matrix by 90 degrees	Medium	adobe akuna-capital amazon apple bloomberg cisco facebook google groupon houzz lyft microsoft nvidia palantir palantir-technologies quora salesforce uber wish yandex
Spiral Matrix 1 - Return	Medium	adobe amazon apple bloomberg bytedance cisco drawbridge ebay epic-systems facebook goldman-sachs google hulu linkedin microsoft oracle paypal quip robinhood snapchat uber visa
Strobogrammatic Number 1 - Check if strobogrammatic	Easy	cisco facebook google
Strobogrammatic Number 2 - Generate for length n	Medium	cisco facebook google twitter
Validate IP Address	Medium	amazon cisco facebook google microsoft twitter uber
Daily Temperatures	Medium	adobe amazon apple bloomberg cisco expedia facebook goldman-sachs google linkedin microsoft nvidia uber zillow
Maximum Subarray Sum	Medium	adobe alibaba amazon apple asana atlassian bloomberg bytedance capital-one cisco citadel ebay expedia facebook goldman-sachs google ibm intel jpmorgan linkedin microsoft morgan-stanley nvidia oracle palantir-technologies paypal qualcomm salesforce sap two-sigma uber visa wayfair yahoo zillow
Add Two Numbers represented as Linked List in Forward order	Medium	amazon apple bloomberg bytedance cisco ebay facebook goldman-sachs google microsoft oracle uber yahoo
Course Schedule 1 - Is it Possible	Medium	amazon apple bloomberg bytedance cisco cohesity ebay facebook goldman-sachs google intuit linkedin microsoft nutanix oracle paypal salesforce uber wish yahoo yelp zenefits
Generate Parentheses	Medium	adobe alibaba amazon apple atlassian bloomberg bytedance cisco facebook google lyft microsoft nutanix nvidia salesforce samsung sap snapchat spotify uber yahoo yandex yelp zenefits
Valid Parentheses	Easy	adobe airbnb akuna-capital amazon apple atlassian audible barclays blizzard bloomberg cisco citadel doordash ebay epic-systems expedia facebook godaddy goldman-sachs google ibm intel intuit jpmorgan linkedin liveramp lyft mathworks microsoft morgan-stanley oracle paypal postmates riot-games salesforce samsung sap servicenow splunk spotify tencent tesla triplebyte twilio twitter uber visa vmware yahoo yandex zenefits zillow
Convert Sorted Array to height-balanced Binary Search Tree	Easy	airbnb amazon apple bloomberg cisco facebook google microsoft oracle yahoo
Intersection of Two Linked Lists	Easy	airbnb alibaba amazon apache-design bloomberg bytedance cisco ebay expedia facebook goldman-sachs google linkedin microsoft morgan-stanley netapp oracle qualcomm redfin sap tencent yahoo
Lowest Common Ancestor of a Binary Search Tree	Medium	adobe amazon bloomberg cisco facebook google linkedin microsoft oracle twitter uber
K Reverse a linked list	Hard	adobe amazon apple bytedance cisco cohesity ebay facebook google mathworks microsoft paypal vmware
Linked List Cycle 1 - Detect Cycle	Easy	adobe amazon apple bloomberg cisco ebay facebook goldman-sachs google linkedin microsoft oracle vmware yahoo
Binary Tree Preorder Traversal	Easy	amazon bloomberg cisco google microsoft
Maximum Profit in Job Scheduling	Hard	airbnb bytedance cisco google ponyai
Binary Tree Level Order Traversal - Level by Level	Medium	adobe amazon apple atlassian bloomberg cisco citadel ebay expedia facebook google linkedin mathworks microsoft oracle sap uber vmware yahoo
Merge Two Sorted Linked Lists	Easy	adobe airbnb alibaba amazon apple arista-networks atlassian bloomberg bytedance capital-one cisco ebay facebook google huawei indeed intel linkedin lyft microsoft oracle paypal samsung tencent uber visa vmware yahoo yandex
Reverse Words in a String	Medium	amazon apple bloomberg cisco citadel facebook google huawei microsoft nvidia oracle qualcomm salesforce snapchat vmware yelp zillow
Longest Palindromic Substring	Medium	adobe airbnb alibaba amazon appdynamics apple bloomberg cisco ebay facebook godaddy google huawei jpmorgan mathworks microsoft nutanix oracle paypal pure-storage roblox samsung sap servicenow tencent uber vmware wayfair yahoo yandex
Convert String to Integer atoi	Medium	adobe amazon apple bloomberg cisco citadel ebay facebook goldman-sachs google linkedin microsoft nvidia oracle redfin sap tencent uber vmware zillow
Longest Common Prefix in array of string	Easy	adobe alibaba amazon apple bloomberg cisco ebay facebook google ibm ixl microsoft oracle pinterest quora snapchat splunk twilio visa yelp
House Robber	Medium	adobe airbnb amazon apple bloomberg bytedance cisco ebay expedia goldman-sachs google hbo linkedin microsoft quora uber
3Sum0 - Find three elements in an array that sum to a zero	Medium	adobe akuna-capital alibaba amazon apple baidu bloomberg bytedance cisco citadel citrix coursera doordash ebay expedia facebook goldman-sachs google groupon ibm mathworks microsoft oracle paypal postmates qualtrics quora salesforce samsung servicenow snapchat splunk square tencent uber visa vmware works-applications yahoo yandex zoho
Two Sum	Easy	adobe aetion affirm airbnb alibaba amazon apple audible baidu blackrock bloomberg bookingcom box bytedance cisco citadel cloudera deutsche-bank didi drawbridge dropbox ebay emc expedia facebook factset ge-digital godaddy goldman-sachs google groupon huawei ibm indeed intel intuit jpmorgan linkedin lyft mathworks microsoft morgan-stanley netease nvidia oracle paypal qualcomm quora radius roblox salesforce samsung sap servicenow snapchat splunk spotify tableau tencent twilio twitter uber valve visa vmware wish works-applications yahoo yandex yelp zillow zoho
Middle of the linked list	Easy	adobe amazon apple cisco goldman-sachs microsoft oracle paypal samsung
Rotate an Array to Right	Medium	amazon bloomberg cisco ebay facebook goldman-sachs microsoft paypal snapchat uber
Number of Islands	Medium	adobe affirm alibaba amazon appdynamics apple arista-networks atlassian audible blackrock bloomberg bytedance cisco citadel citrix cohesity cruise-automation doordash ebay electronic-arts evernote expedia facebook godaddy goldman-sachs google houzz hulu jpmorgan linkedin liveramp lyft mathworks microsoft nutanix nvidia oracle palantir-technologies paypal qualtrics roblox salesforce servicenow snapchat splunk spotify square sumologic tableau twitch twitter uber visa vmware wish yahoo zenefits zulily
Reorder List such that i-th element points to n-i-th element	Medium	adobe amazon apple bytedance cisco ebay facebook google linkedin microsoft splunk tencent
Decode Ways	Medium	adobe amazon apple baidu barclays bloomberg cisco databricks expedia facebook goldman-sachs google huawei lyft microsoft oracle pinterest snapchat square twitter uber
Merge Overlapping Intervals	Medium	adobe alibaba amazon apple atlassian bloomberg bytedance cisco cohesity coupang cruise-automation dataminr doordash ebay facebook godaddy goldman-sachs google intuit linkedin microsoft netflix oracle palantir-technologies paypal pinterest postmates salesforce sap servicenow snapchat sumologic tencent twitch twitter two-sigma uber visa vmware wayfair wish yahoo yandex yelp zulily
Group Anagrams	Medium	adobe affirm amazon apple bloomberg bookingcom cisco docusign ebay electronic-arts facebook goldman-sachs google hulu intuit mathworks microsoft nutanix oracle qualtrics salesforce servicenow snapchat tesla twilio uber visa vmware wish yahoo yandex yelp zulily robinhood
Search in Rotated Sorted Array	Medium	adobe alibaba amazon apple baidu bloomberg bytedance cisco ebay expedia facebook goldman-sachs google ixl jpmorgan linkedin microsoft netease nutanix nvidia oracle paypal salesforce samsung snapchat tencent tesla tripadvisor twitch uber visa vmware yahoo yandex zillow zulily
Design LRU Cache	Medium	adobe alibaba amazon apple asana baidu bloomberg bytedance cisco citadel cloudera cruise-automation docusign doordash dropbox ebay expedia facebook godaddy goldman-sachs google groupon hbo intuit jpmorgan linkedin lyft microsoft morgan-stanley nutanix nvidia oracle palantir-technologies paypal pinterest roblox salesforce sap snapchat splunk spotify tesla tripadvisor twilio twitch twitter two-sigma uber visa vmware wish yahoo yandex zenefits zillow
Reverse String	Easy	adobe amazon apple bloomberg cisco ebay facebook godaddy goldman-sachs google microsoft oracle paypal servicenow snapchat uber
Best Time To Buy And Sell Stock 1 - only one transaction	Easy	adobe akuna-capital alibaba amazon apple atlassian audible blackrock bloomberg bytedance cisco citadel deutsche-bank doordash expedia facebook goldman-sachs google grab groupon intel jpmorgan linkedin lyft microsoft morgan-stanley oracle paypal redfin sap snapchat tableau tencent uber visa vmware yahoo zillow
Merge Two Sorted Arrays	Easy	adobe amazon apple baidu bloomberg bytedance cisco ebay expedia facebook goldman-sachs google ibm indeed linkedin lyft microsoft netflix oracle quip tableau uber vmware yahoo yandex
Valid Palindrome	Easy	adobe amazon apple bloomberg cisco ebay facebook google linkedin microsoft oracle spotify uber wayfair wish yandex zenefits
Remove duplicates from Sorted Array 1	Easy	adobe amazon apple bloomberg cisco cohesity ebay facebook google hulu microsoft oracle servicenow uber vmware