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4301 problems total

Array (1905)Sorting (440)Depth First Search (316)Database (301)Breadth First Search (241)Tree (240)Stack (172)Graph Theory (169)Linked List (81)Monotonic Stack (67)Queue (50)Recursion (48)Shortest Path (33)
All Topics(4301)Algorithms(3944)Database(305)Networking(0)Object Oriented Design(31)Programming Languages(5)System Design(0)

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TitleDifficultyVideosCompanies
Closest Binary Search Tree Value IIhard-
amazonfacebookforusall
Integer to English Wordshard
amazonapplebarclays
H-Indexmedium-
adobebloombergfacebook
H-Index 2medium-
facebook
Pain Fencemedium-
google
Find the Celebritymedium-
amazonapplefacebook
First Bad Versioneasy-
adobeamazonbloomberg
Least Number of Perfect Squares that Sums to nmedium-
adobeamazonapple
Wiggle Sort 1medium-
airbnbamazonfacebook
Zigzag Iteratormedium-
amazonapplecruise-automation
Expression Add Operatorshard-
applebytedancefacebook
Move Zeroes at the end of arrayeasy-
adobeamazonapple
Peeking Iteratormedium-
amazonappleatlassian
Inorder Successor in Binary Search Treemedium-
amazonbloombergcitadel
Walls and Gatesmedium-
amazonapplebloomberg
Find Duplicate Number in array containing n+1 numbers between 1 and nmedium-
adobeamazonapple
Unique Word Abbreviationmedium-
google
Game of Lifemedium-
amazonbloombergdropbox
Word Pattern 1easy-
amazoncapital-onedropbox
Word Pattern 2medium-
dropboxfacebookpony-ai
Nim Gameeasy-
adobebloomberg
Flip Game 1easy-
google
Flip Game 2medium-
google
Find Median from Data Streamhard
adobeamazonapple
Best Meeting Pointhard-
amazonfacebookgoogle
Serialize and Deserialize Binary Treehard
amazonapplebloomberg
Binary Tree Longest Consecutive Sequencemedium-
amazonfacebookgoogle
Bulls and Cowsmedium-
airbnbamazongoogle
Longest Increasing Subsequencemedium
adobeamazonapple
Remove Invalid Parentheses Problemhard-
amazonapplebloomberg
Smallest Rectangle Enclosing Black Pixelshard-
google
Range Sum Query - Immutableeasy-
amazonbloombergfacebook
Range Sum Query 2D - Immutablemedium-
amazonapplecruise-automation
Number of Islands IIhard-
amazonfacebookgoogle
Additive Numbermedium-
epic-systems
Range Sum Query – Mutablemedium-
amazonfacebookgoogle
Range Sum Query 2D - Mutablemedium-
facebookgooglemicrosoft
Best Time To Buy And Sell Stock With Cooldownmedium-
amazonapplefacebook
Minimum Height Treesmedium-
amazonapplebloomberg
Sparse Matrix Multiplicationmedium-
amazonapplebloomberg
Burst Balloonshard-
adobeamazonfacebook
Super Ugly Numbermedium-
google
Binary Tree Traversal - Vertical Order Traversalmedium-
adobeamazonbloomberg
Count of Smaller Numbers After Selfhard-
adobeamazonapple
Remove Duplicate Lettersmedium-
adobeamazonapple
Shortest Distance from All Buildingshard-
amazonbytedancefacebook
Maximum Product of Word Lengthsmedium-
google
Bulb Switchermedium-
amazonfacebookmathworks
Generalized Abbreviationmedium-
bytedancegoogle
Create Maximum Numberhard-
amazongoogle
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