| Count Different Palindromic Subsequences | Hard | facebook
google
linkedin
pure-storage | |
| Dutch National Flag DNF | Medium | amazon
apple
bloomberg
ebay
facebook
google
linkedin
microsoft
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paypal
pocket-gems
pure-storage
uber
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yahoo | |
| Insert Delete Search and GetRandom in Constant Time 1 - Dupes not allowed | Medium | adobe
affirm
amazon
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databricks
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goldman-sachs
google
indeed
linkedin
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quora
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two-sigma
uber
visa
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yandex
yelp | |
| Palindromic Substrings | Medium | adobe
amazon
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atlassian
citadel
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google
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mathworks
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roblox
twitter
uber
vmware | |
| Max Stack | Hard | amazon
bloomberg
facebook
google
linkedin
lyft
microsoft
pure-storage
snapchat
twitter | |
| Design Skiplist | Hard | ebay
google
microsoft
pure-storage
twitter | |
| Valid Square | Medium | facebook
google
pure-storage | |
| Longest Palindromic Substring | Medium | adobe
airbnb
alibaba
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cisco
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nutanix
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roblox
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yahoo
yandex | |
| 2Sum 2 – Input array is sorted | Medium | amazon
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expedia
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google
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pure-storage | |
| Remove Linked List Elements | Easy | adobe
amazon
apple
bloomberg
capital-one
facebook
google
microsoft
paypal
pure-storage
uber | |
| Min Stack | Medium | adobe
amazon
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bloomberg
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goldman-sachs
google
groupon
intuit
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microsoft
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uber
visa
wish
zenefits | |
| Happy Number | Easy | adobe
airbnb
amazon
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evernote
facebook
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jpmorgan
microsoft
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pinterest
pure-storage
twitter
uber | |