| Populate next pointer to right node in Binary Tree |
Medium
|
amazon
bloomberg
facebook
google
microsoft
oracle
|
|
| Reconstruct Itinerary Problem |
Hard
|
amazon
apple
bloomberg
citadel
facebook
goldman-sachs
google
microsoft
qualtrics
snapchat
square
twilio
uber
yandex
yelp
|
|
| Remove Invalid Parentheses Problem |
Hard
|
amazon
apple
bloomberg
facebook
google
houzz
ponyai
postmates
uber
|
|
| Remove K Digits Problem |
Medium
|
adobe
amazon
bloomberg
bytedance
didi
facebook
google
microsoft
nutanix
oracle
snapchat
vmware
|
|
| Remove Outermost Parentheses Problem |
Easy
|
apple
facebook
google
|
|
| Reverse Bits |
Easy
|
airbnb
amazon
apple
facebook
google
samsung
tencent
|
|
| Reverse Words in a String 2 |
Medium
|
amazon
google
microsoft
uber
vmware
|
|
| Reverse Words in a String 3 |
Easy
|
amazon
apple
bloomberg
microsoft
paypal
salesforce
snapchat
yahoo
zappos
|
|
| 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
|
|
| Search in Rotated Sorted Array 2 - Check if number exists - Duplicates allowed |
Medium
|
adobe
amazon
bloomberg
facebook
google
microsoft
|
|
| Select Copy Paste Problem 1 - Minimum operations |
Medium
|
bloomberg
microsoft
|
|
| Serialize and Deserialize Binary Tree |
Hard
|
amazon
apple
bloomberg
citadel
ebay
expedia
facebook
google
groupon
indeed
linkedin
microsoft
oracle
qualtrics
quora
salesforce
snapchat
tableau
uber
vmware
yahoo
|
|
| Shortest Palindrome 1 - Prepending characters |
Hard
|
adobe
amazon
bloomberg
facebook
google
microsoft
oracle
pocket-gems
|
|
| Smallest K-Length Subsequence With Occurrences of a Letter Problem |
Hard
|
|
|
| Sort Characters By Frequency |
Medium
|
amazon
bloomberg
expedia
facebook
google
linkedin
uber
|
|
| 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
|
|
| Square root of an integer |
Easy
|
amazon
apple
bloomberg
facebook
google
huawei
linkedin
lyft
microsoft
qualtrics
uber
wayfair
|
|
| Strobogrammatic Number 1 - Check if strobogrammatic |
Easy
|
cisco
facebook
google
|
|
| Strobogrammatic Number 2 - Generate for length n |
Medium
|
cisco
facebook
google
twitter
|
|
| Strobogrammatic Number 3 - Count in Range |
Hard
|
facebook
google
|
|
| Student Attendance Record 1 Problem |
Easy
|
google
|
|
| Student Attendance Record 2 Problem |
Hard
|
google
uber
|
|
| Subset Sum Problem 1 - Is there a subset? |
|
|
|
| Sudoku Solver Problem |
Hard
|
adobe
amazon
apple
arista-networks
doordash
dropbox
expedia
facebook
google
microsoft
oracle
riot-games
roblox
snapchat
uber
vmware
wish
|
|
| Sum of Beauty of All Substrings Problem |
Medium
|
|
|
| Swap Nodes in Pairs |
Medium
|
adobe
amazon
apple
bloomberg
ebay
facebook
google
lyft
microsoft
oracle
sap
uber
|
|
| Trips and Users Problem |
Hard
|
amazon
uber
|
|
| Unique BSTs 2 - Generate |
Medium
|
adobe
amazon
apple
facebook
microsoft
yahoo
|
|
| Valid Number Problem |
Hard
|
adobe
amazon
apple
facebook
google
linkedin
microsoft
tripadvisor
|
|
| Valid Parenthesis String |
Medium
|
alibaba
amazon
bloomberg
facebook
google
|
|
| Valid Sudoku Problem |
Medium
|
adobe
amazon
apple
bloomberg
cruise-automation
doordash
facebook
google
microsoft
oracle
pinterest
roblox
salesforce
snapchat
twitter
uber
vmware
|
|
| Validate Binary Search Tree |
Medium
|
adobe
amazon
apple
asana
atlassian
bloomberg
bytedance
capital-one
ebay
facebook
goldman-sachs
google
linkedin
mathworks
microsoft
oracle
salesforce
sap
tripadvisor
uber
visa
vmware
yahoo
yandex
|
|
| Word Break 2 - Construct a sentence |
Hard
|
amazon
apple
audible
bloomberg
bookingcom
dropbox
ebay
facebook
google
microsoft
oracle
pinterest
snapchat
twitter
uber
zillow
|
|
| Zigzag Iterator |
Medium
|
amazon
apple
cruise-automation
facebook
google
microsoft
yandex
|
|
| Validate IP Address Problem |
Medium
|
amazon
cisco
facebook
google
microsoft
twitter
uber
|
|
| Encode String with Shortest Length Problem |
Hard
|
google
|
|
| Implement Rand10() Using Rand7() |
Medium
|
apple
bloomberg
bytedance
linkedin
microsoft
|
|
| Magical String Problem |
Medium
|
google
|
|
| Inorder Successor in Binary Tree |
Medium
|
|
|
| Permutation in String Problem |
Medium
|
amazon
bloomberg
facebook
google
lyft
microsoft
uber
yahoo
yandex
|
|
| Can Make Arithmetic Progression From Sequence |
Easy
|
amazon
|
|
| Constrained Subsequence Sum |
Hard
|
akuna-capital
|
|
| Count Nice Pairs in an Array |
Medium
|
|
|
| Maximum Score of a Good Subarray |
Hard
|
|
|
| Minimize Maximum of Array |
Medium
|
|
|
| Nested Array Generator |
Medium
|
|
|
| Remove Colored Pieces if Both Neighbors are the Same Color Problem |
Medium
|
|
|
| Removing Stars From a String Problem |
Medium
|
|
|
| Time Needed to Inform All Employees |
Medium
|
google
|
|
| Sales Analysis II |
Easy
|
amazon
|
|