All Problems

39 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
Two Sumeasy
adobeaetionaffirm
Add Two Numbers represented as Linked List in Reversed Ordermedium-
adobeaetionairbnb
Longest Palindromic Substringmedium
adobeairbnbalibaba
3Sum0 - Find three elements in an array that sum to a zeromedium
adobeakuna-capitalalibaba
Valid Parentheseseasy
adobeairbnbakuna-capital
Merge K Sorted Listshard
adobeairbnbalibaba
K Reverse a linked listhard-
adobeamazonapple
Multiply Stringsmedium-
amazonappleexpedia
Group Anagramsmedium
adobeaffirmamazon
Unique Paths in Grid 1 - Count all paths moving right or downmedium
adobealibabaamazon
Unique Paths in Grid 2 - Count all paths moving right or down with obstaclesmedium-
amazonapplebloomberg
Validate Binary Search Treemedium
adobeamazonapple
Binary Tree Level Order Traversal - Level by Levelmedium
adobeamazonapple
Construct Binary Tree from Inorder and Postorder Traversalmedium-
amazonbloombergfacebook
Distinct Subsequenceshard-
adobeamazonbarclays
Clone Undirected Graphmedium
amazonapplefacebook
Binary Tree Right Side Viewmedium-
adobeamazonapple
Number of Islandsmedium
adobeaffirmalibaba
Reverse Linked Listeasy
adobealibabaamazon
Implement stack using queueseasy-
amazonbloombergcitadel
Implement Queue using Stackseasy-
amazonapplebloomberg
Verify Preorder Sequence in Binary Search Treemedium-
mathworksuberzenefits
3Sum Smallermedium-
googleibmmathworks
Binary Tree Traversal - Vertical Order Traversalmedium-
adobeamazonbloomberg
Shortest Distance from All Buildingshard-
amazonbytedancefacebook
Bulb Switchermedium-
amazonfacebookmathworks
Counting Bitseasy
amazonapplebloomberg
Sum of Left Leaveseasy
adobeamazonbloomberg
Keyboard Roweasy-
mathworks
Generate Nth Fibonacci Numbereasy
amazonapplebarclays
Beautiful Arrangementmedium-
googlemathworks
Reshape the Matrixeasy-
mathworks
Palindromic Substringsmedium
adobeamazonapple
Max Area of Islandmedium-
adobeaffirmamazon
Degree of an Arrayeasy-
citrixge-digitalixl
Cherry Pickuphard-
adobeakuna-capitalamazon
Rectangle Overlapeasy-
adobeamazonapple
Last Substring in Lexicographical Orderhard-
goldman-sachsmathworksroblox
Number of Operations to Make Network Connectedmedium-
akuna-capitalmathworks