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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
Subsets 2	Medium	amazon bloomberg facebook microsoft
Recover Binary Search Tree	Medium	amazon bloomberg facebook goldman-sachs google microsoft uber
Edit Distance	Medium	adobe amazon apple baidu bloomberg bytedance facebook goldman-sachs google intuit linkedin microsoft paypal qualcomm square uber vmware yahoo
Simplify Path	Medium	adobe amazon bloomberg bytedance docusign facebook microsoft oracle salesforce yandex quora
Search a 2D Matrix 1 - Elements sorted row-wise and first integer of each row is greater than last element of previous row is greater than last element of previous row	Medium	adobe amazon apple bloomberg facebook google microsoft uber
Unique Paths in Grid 2 - Count all paths moving right or down with obstacles	Medium	amazon apple bloomberg cruise-automation epic-systems facebook godaddy goldman-sachs google mathworks microsoft qualcomm snapchat vmware yahoo
Rotate Linked List to Right	Medium	adobe airbnb amazon bloomberg facebook linkedin microsoft
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
Trapping Rain Water	Hard	adobe affirm airbnb amazon apple audible bloomberg bytedance citadel databricks dataminr ebay electronic-arts facebook flipkart goldman-sachs google grab huawei lyft microsoft nvidia oracle palantir-technologies qualtrics salesforce servicenow snapchat tableau twitter uber visa wish yahoo yandex zenefits
Combination Sum 2 - Cant Reuse same element	Medium	adobe amazon apple bloomberg ebay facebook google linkedin microsoft nutanix snapchat uber
First Missing Positive	Hard	adobe amazon apple bloomberg bytedance databricks ebay facebook google grab inmobi microsoft model-N morgan-stanley oracle pocket-gems salesforce sap stripe tesla twitch uber vmware wayfair wish
Combination Sum 1	Medium	airbnb akuna-capital amazon apple bloomberg ebay facebook goldman-sachs google jpmorgan linkedin microsoft quora snapchat square uber vmware yelp
Find first and last positions of target element in sorted array	Medium	airbnb amazon apple bloomberg bytedance facebook google linkedin microsoft netflix oracle qualtrics quip uber visa yahoo yandex
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
3Sum - Closest	Medium	adobe amazon apple bloomberg facebook goldman-sachs google microsoft sap uber vmware yandex
Interleaving String	Medium	amazon apple bloomberg google microsoft nvidia uber vmware
Increasing Triplet Subsequence	Medium	amazon bloomberg facebook google uber yahoo
Summary Ranges	Easy	amazon bloomberg capital-one facebook google indeed microsoft uber yandex
Game of Life	Medium	amazon bloomberg dropbox facebook goldman-sachs google microsoft opendoor oracle reddit snapchat two-sigma uber zillow
Single Element in a Sorted Array	Medium	amazon apple atlassian bloomberg facebook google microsoft twitter
LFU Cache	Hard	adobe alibaba amazon apple bloomberg goldman-sachs google linkedin microsoft salesforce snapchat uber vmware
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
Cheapest Flights Within K Stops Problem	Medium	airbnb amazon bloomberg ebay facebook google microsoft
Symmetric Binary Tree	Easy	adobe alibaba amazon apple atlassian audible bloomberg facebook google linkedin microsoft oracle salesforce sap tripadvisor twitter uber visa vmware yandex
Gas Station	Medium	amazon apple bloomberg deshaw expedia google ibm microsoft paypal
Single Number 1 - All elements except one occur twice	Easy	adobe airbnb amazon apple atlassian bloomberg facebook google microsoft oracle palantir-technologies tencent
Reverse String	Easy	adobe amazon apple bloomberg cisco ebay facebook godaddy goldman-sachs google microsoft oracle paypal servicenow snapchat uber
2Sum 2 – Input array is sorted	Medium	amazon apple bloomberg bytedance expedia facebook goldman-sachs google microsoft paypal pure-storage
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
Move Zeroes at the end of array	Easy	adobe amazon apple bloomberg cohesity dell ebay facebook goldman-sachs google lyft microsoft nutanix oracle paypal qualcomm sap tesla uber yahoo yandex zillow
Squares of a Sorted array	Easy	adobe amazon apple bloomberg bytedance ebay electronic-arts facebook google jane-street microsoft nutanix oracle paypal splunk twitch uber vmware
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
Remove Element	Easy	amazon bloomberg google microsoft
Reverse Linked List	Easy	adobe alibaba amazon apple bloomberg bytedance cisco citrix docusign ebay electronic-arts facebook factset goldman-sachs google intel mathworks microsoft nvidia oracle paypal qualcomm snapchat spotify tencent tripadvisor twitter uber visa vmware yahoo yandex yelp zenefits
Permutations of Array 1	Medium	adobe amazon apple atlassian bloomberg bytedance cisco ebay facebook garena godaddy goldman-sachs google linkedin microsoft netease oracle paypal salesforce sap uber vmware yahoo
Integer To Roman	Medium	adobe amazon apple blackrock bloomberg evernote facebook google linkedin microsoft opendoor oracle paypal salesforce twitter yahoo
Roman To Integer	Easy	adobe amazon apple bloomberg facebook goldman-sachs google linkedin microsoft oracle qualtrics uber yahoo zillow
String Compression	Medium	akuna-capital amazon apple bloomberg ebay expedia facebook godaddy goldman-sachs google lyft microsoft redfin snapchat spotify wayfair yandex yelp zillow
Number of Dice Rolls With Target Sum	Medium	amazon bloomberg google microsoft spotify
Remove Nth Node From End of List	Medium	adobe amazon apple bloomberg bytedance cisco facebook goldman-sachs google microsoft oracle vmware yandex
Valid Anagram	Easy	amazon apple bloomberg cisco docusign expedia facebook goldman-sachs google microsoft morgan-stanley oracle paypal servicenow snapchat uber yahoo yelp zulily
Letter Combinations of a Phone Number	Medium	amazon apple atlassian bloomberg cisco dropbox ebay facebook goldman-sachs google jpmorgan lyft microsoft morgan-stanley nutanix oracle quip roblox salesforce servicenow square twilio uber vmware yahoo yelp
4Sum	Medium	adobe amazon apple bloomberg facebook google microsoft samsung yahoo
Regular Expression Matching Problem	Hard	adobe airbnb alibaba amazon apple bloomberg bytedance coursera databricks ebay facebook flipkart google houzz lyft microsoft oracle palantir-technologies pocket-gems twitter uber zulily
Wildcard Matching	Hard	adobe amazon bloomberg bytedance coursera cruise-automation facebook goldman-sachs google microsoft oracle snapchat twitter two-sigma
Add Two Numbers represented as Linked List in Reversed Order	Medium	adobe aetion airbnb alibaba amazon apple baidu bloomberg bytedance capital-one cisco dell docusign ebay facebook flipkart google grab huawei ibm intel lyft mathworks microsoft nvidia oracle paypal qualcomm redfin salesforce servicenow uber vmware wish yahoo yandex zoho
Binary Search Tree BST Inorder Iterator	Medium	alibaba amazon apple atlassian bloomberg bytedance cisco cloudera ebay facebook google linkedin microsoft oracle qualtrics redfin splunk uber