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40 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
Find the Index of the First Occurrence in a Stringeasy-
adobeamazonapple
Two Sumeasy
adobeaetionaffirm
Convert String to Integer atoimedium-
adobeamazonapple
3Sum0 - Find three elements in an array that sum to a zeromedium
adobeakuna-capitalalibaba
Valid Parentheseseasy
adobeairbnbakuna-capital
Longest Valid Parentheseshard-
adobeamazonapple
Trapping Rain Waterhard-
adobeaffirmairbnb
Maximum Subarray Summedium
adobealibabaamazon
Climbing Stairs - Take atmost 2 Stepseasy
adobealibabaamazon
Maximal Rectanglehard-
adobeamazonbloomberg
Binary Tree Level Order Traversal - Level by Levelmedium
adobeamazonapple
Construct Binary Tree from Inorder and Preorder Traversalmedium
adobeamazonapple
Best Time To Buy And Sell Stock 1 - only one transactioneasy
adobeakuna-capitalalibaba
Best Time To Buy And Sell Stock 2 - Any number of timesmedium-
adobeamazonapple
Best Time To Buy And Sell Stock 3 - at most twicehard-
amazonappleatlassian
Design LRU Cachemedium-
adobealibabaamazon
Reverse Words in a Stringmedium-
amazonapplebloomberg
Binary Tree Right Side Viewmedium-
adobeamazonapple
Number of Islandsmedium
adobeaffirmalibaba
Word Search 2 - Return All Wordshard
airbnbamazonapple
Maximal Squaremedium-
adobeairbnbamazon
Implement stack using queueseasy-
amazonbloombergcitadel
Implement Queue using Stackseasy-
amazonapplebloomberg
Sliding Window Maximumhard-
adobealibabaamazon
Search a 2D Matrix 2 - Rows and columns are sortedmedium-
adobeamazonapple
Different Ways to Add Parenthesesmedium-
amazonciscocitadel
Maximum Intervals Overlap Countmedium
amazonappleatlassian
Inorder Successor in Binary Search Treemedium-
amazonbloombergcitadel
Find Median from Data Streamhard
adobeamazonapple
Serialize and Deserialize Binary Treehard
amazonapplebloomberg
Reconstruct Itineraryhard-
amazonapplebloomberg
Longest Substring with At Most K Distinct Charactersmedium-
amazonappdynamicsbloomberg
Design Circular Queuemedium-
airbnbamazonapple
Maximum Product of Three Numberseasy-
amazonapplebloomberg
Palindromic Substringsmedium
adobeamazonapple
Maximum Length of Repeated Subarraymedium-
citadelindeedintuit
Find Pivot Indexeasy-
amazonapplebloomberg
Consecutive Numbers Sumhard-
citadelcitrixindeed
Knight Dialermedium-
boxcitadelfacebook
Longest String Chainmedium-
akuna-capitalamazoncitadel