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66 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
Valid Parentheseseasy
adobeairbnbakuna-capital
Longest Valid Parentheseshard-
adobeamazonapple
Trapping Rain Waterhard-
adobeaffirmairbnb
Largest Rectangle in Histogramhard-
adobeamazonbloomberg
Maximal Rectanglehard-
adobeamazonbloomberg
Binary Tree Inorder Traversaleasy-
alibabaamazonapple
Flatten binary tree to linked list in order of preorder traversalmedium-
adobeamazonapple
Reorder List such that i-th element points to n-i-th elementmedium
adobeamazonapple
Binary Tree Preorder Traversaleasy-
amazonbloombergcisco
Binary Tree Postorder Traversaleasy-
adobeamazonfacebook
Evaluate Reverse Polish Notationmedium-
amazonatlassianfacebook
Min Stackmedium-
adobeamazonapple
Binary Search Tree BST Inorder Iteratormedium-
alibabaamazonapple
Basic Calculator 1hard-
adobeamazonbloomberg
Implement stack using queueseasy-
amazonbloombergcitadel
Basic Calculator 2 Problemmedium-
airbnbamazonapple
Implement Queue using Stackseasy-
amazonapplebloomberg
Palindrome Linked Listeasy-
adobeamazonapple
Closest Binary Search Tree Value IIhard-
amazonfacebookforusall
Remove Duplicate Lettersmedium-
adobeamazonapple
Create Maximum Numberhard-
amazongoogle
Verify Preorder Serialization of a Binary Treemedium-
google
Flatten Nested List Iteratormedium-
airbnbamazonapple
Mini Parsermedium-
airbnbgoogle
Longest Absolute File Pathmedium-
amazonapplefacebook
Decode Stringmedium-
alibabaamazonappdynamics
Remove K Digitsmedium-
adobeamazonbloomberg
Convert Binary Search Tree to Sorted Doubly Linked Listmedium-
amazonbloombergdatabricks
Add Two Numbers represented as Linked List in Forward ordermedium-
amazonapplebloomberg
132 Patternmedium-
amazonfacebookgoogle
Find Permutationmedium-
google
Next Greater Element 1easy-
amazonbloombergfacebook
Next Greater Element 2medium-
amazonbloombergfacebook
Shortest Unsorted Continuous Subarraymedium-
amazonbloomberggoogle
Tag Validatorhard-
googlemicrosoftuber
Exclusive Time of Functionsmedium-
amazonapplefacebook
Maximum Binary Treemedium-
amazonfacebookgoogle
Valid Parenthesis Stringmedium-
alibabaamazonbloomberg
Baseball Gameeasy-
amazongoogle
Max Stackhard-
amazonbloombergfacebook
Number of Atomshard-
adobeamazonbytedance
Asteroid Collisionmedium-
amazonbytedanceebay
Parse Lisp Expressionhard-
affirmgoogle
Daily Temperaturesmedium-
adobeamazonapple
Max Chunks To Make Sorted 2hard-
googlemicrosoft
Max Chunks to Make Sortedmedium
googlemicrosoftuber
Basic Calculator 4hard-
amazongoogleindeed
Basic Calculator 3hard-
amazonapplebytedance
Backspace String Compareeasy-
amazonatlassianfacebook
Car Fleetmedium-
google
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