| Pascal’s Triangle 2 - Return nth row |
Easy
|
amazon
goldman-sachs
google
oracle
qualtrics
|
|
| Peeking Iterator |
Medium
|
amazon
apple
atlassian
ebay
facebook
google
microsoft
oracle
yahoo
|
|
| Populate next pointer to right node in Binary Tree |
Medium
|
amazon
bloomberg
facebook
google
microsoft
oracle
|
|
| Range Sum Query – Mutable |
Medium
|
amazon
facebook
google
twitter
|
|
| Range Sum Query 2D - Immutable |
Medium
|
amazon
apple
cruise-automation
facebook
google
houzz
lyft
microsoft
vmware
|
|
| Reconstruct Itinerary |
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 |
Medium
|
adobe
amazon
bloomberg
bytedance
didi
facebook
google
microsoft
nutanix
oracle
snapchat
vmware
|
|
| Remove Outermost Parentheses |
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
|
|
| 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
|
|
| Scramble String |
Hard
|
apple
google
|
|
| Search in Rotated Sorted Array 2 - Check if number exists - Duplicates allowed |
Medium
|
adobe
amazon
bloomberg
facebook
google
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
|
|
| Sort Characters By Frequency |
Medium
|
amazon
bloomberg
expedia
facebook
google
linkedin
uber
twitter
|
|
| 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 |
Easy
|
google
|
|
| Student Attendance Record 2 |
Hard
|
google
uber
|
|
| Sudoku Solver |
Hard
|
adobe
amazon
apple
arista-networks
doordash
dropbox
expedia
facebook
google
microsoft
oracle
riot-games
roblox
snapchat
uber
vmware
wish
|
|
| Surrounded Regions |
Medium
|
amazon
ebay
facebook
google
splunk
uber
|
|
| Swap Nodes in Pairs |
Medium
|
adobe
amazon
apple
bloomberg
ebay
facebook
google
lyft
microsoft
oracle
sap
uber
|
|
| Valid Number |
Hard
|
adobe
amazon
apple
facebook
google
linkedin
microsoft
tripadvisor
|
|
| Valid Parenthesis String |
Medium
|
alibaba
amazon
bloomberg
facebook
google
|
|
| Valid Sudoku |
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 |
Medium
|
amazon
cisco
facebook
google
microsoft
twitter
uber
|
|
| Convex Polygon |
Medium
|
google
|
|
| Encode String with Shortest Length |
Hard
|
google
|
|
| Heaters Problem |
Medium
|
amazon
google
|
|
| Magical String |
Medium
|
google
|
|
| Sliding Window Median |
Hard
|
amazon
apple
facebook
google
microsoft
snapchat
spotify
|
|
| Shortest Path in a Grid with Obstacles Elimination |
Hard
|
didi
google
|
|
| Permutation in String |
Medium
|
amazon
bloomberg
facebook
google
lyft
microsoft
uber
yahoo
yandex
|
|
| Find in Mountain Array |
Hard
|
apple
google
|
|
| Fruit Into Baskets |
Medium
|
amazon
google
|
|
| Number of Closed Islands |
Medium
|
amazon
facebook
google
|
|
| Number of Ways to Stay in the Same Place After Some Steps |
Hard
|
facebook
google
|
|
| Time Needed to Inform All Employees |
Medium
|
google
|
|
| Remove All Adjacent Duplicates In String 1 |
Easy
|
amazon
bloomberg
facebook
google
oracle
paypal
paytm
|
|
| Diagonal Traverse 2 |
Medium
|
facebook
google
|
|
| Find Duplicate Subtrees |
Medium
|
amazon
bloomberg
facebook
google
lyft
microsoft
oracle
uber
|
|
| Most Common Word |
Easy
|
amazon
apple
google
microsoft
oracle
|
|