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54 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
Longest Substring Without Repeating Charactersmedium
adobealationalibaba
Letter Combinations of a Phone Numbermedium-
amazonappleatlassian
Valid Parentheseseasy
adobeairbnbakuna-capital
Merge Two Sorted Linked Listseasy
adobeairbnbalibaba
Generate Parenthesesmedium-
adobealibabaamazon
Merge K Sorted Listshard
adobeairbnbalibaba
Next Permutationmedium-
adobeamazonapple
Permutations of Array 1medium-
adobeamazonapple
Maximum Subarray Summedium
adobealibabaamazon
Merge Overlapping Intervalsmedium
adobealibabaamazon
Subsets 1medium
adobeamazonapple
Validate Binary Search Treemedium
adobeamazonapple
Symmetric Binary Treeeasy-
adobealibabaamazon
Binary Tree Level Order Traversal - Level by Levelmedium
adobeamazonapple
Best Time To Buy And Sell Stock 1 - only one transactioneasy
adobeakuna-capitalalibaba
Best Time To Buy And Sell Stock 3 - at most twicehard-
amazonappleatlassian
Candy distributionhard-
amazonapplegoogle
Single Number 1 - All elements except one occur twiceeasy
adobeairbnbamazon
Evaluate Reverse Polish Notationmedium-
amazonatlassianfacebook
Binary Search Tree BST Inorder Iteratormedium-
alibabaamazonapple
Binary Tree Right Side Viewmedium-
adobeamazonapple
Number of Islandsmedium
adobeaffirmalibaba
Kth Largest Element in an Arraymedium-
adobeairbnbalibaba
Basic Calculator 2 Problemmedium-
airbnbamazonapple
Lowest Common Ancestor of a Binary Treemedium
adobeairbnbamazon
Maximum Intervals Overlap Countmedium
amazonappleatlassian
Peeking Iteratormedium-
amazonappleatlassian
Find Median from Data Streamhard
adobeamazonapple
Longest Increasing Subsequencemedium
adobeamazonapple
Flatten Nested List Iteratormedium-
airbnbamazonapple
Logger Rate Limitereasy-
amazonappleatlassian
Design Hit Countermedium-
affirmamazonapple
Find Leaves of Binary Treemedium-
amazonatlassianebay
Decode Stringmedium-
alibabaamazonappdynamics
Random Pick with Weightmedium-
amazonappleatlassian
Single Element in a Sorted Arraymedium-
amazonappleatlassian
Diameter Of a Binary Treeeasy-
adobeamazonapple
Number of Provincesmedium-
adobeamazonatlassian
Palindromic Substringsmedium
adobeamazonapple
Valid Palindrome 2easy-
atlassianfacebookgoogle
Top K Frequent Wordsmedium-
adobeamazonapple
Insert into a Binary Search Treemedium-
amazonatlassianfacebook
Design HashMapeasy-
adobeamazonapple
Subarray Product Less Than Kmedium-
akuna-capitalatlassiancoursera
Shortest Distance to a Charactereasy-
appleatlassianbloomberg
Backspace String Compareeasy-
amazonatlassianfacebook
Lemonade Changeeasy
amazonatlassian
Leaf-Similar Treeseasy-
amazonatlassianfacebook
Time Based Key-Value Storemedium-
amazonappleatlassian
Greatest Common Divisor of Stringseasy-
atlassiancapital-one
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