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30 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)Database(305)Networking(0)Object Oriented Design(31)Programming Languages(5)System Design(0)Algorithms(3944)

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Title	Difficulty	Videos	Companies
Find the Index of the First Occurrence in a String	easy	-	adobe amazon apple
Reverse Integer	medium	-	adobe amazon apple
Longest Valid Parentheses	hard	-	adobe amazon apple
Valid Sudoku	medium		adobe amazon apple
Sudoku Solver	hard	-	adobe amazon apple
Jump Game 2 - Get min jumps	medium	-	adobe amazon apple
Permutations of Array 1	medium	-	adobe amazon apple
Spiral Matrix 1 - Return	medium		adobe amazon apple
Convert Sorted List into a height-balanced Binary search Tree	medium	-	amazon bloomberg facebook
Populate next pointer to right node in Binary Tree	medium	-	amazon bloomberg facebook
Best Time To Buy And Sell Stock 1 - only one transaction	easy		adobe akuna-capital alibaba
Count Primes	medium	-	adobe amazon apple
Shortest Palindrome 1 - Prepending characters	hard	-	adobe amazon bloomberg
Generate nth ugly number	medium	-	amazon oracle uber
Peeking Iterator	medium	-	amazon apple atlassian
Find Duplicate Number in array containing n+1 numbers between 1 and n	medium	-	adobe amazon apple
Find Median from Data Stream	hard		adobe amazon apple
Serialize and Deserialize Binary Tree	hard		amazon apple bloomberg
Top K Frequent Elements	medium		amazon apple bloomberg
Data Stream as Disjoint Intervals	hard	-	amazon facebook google
Design Hit Counter	medium	-	affirm amazon apple
Remove K Digits	medium	-	adobe amazon bloomberg
Frog Jump	hard	-	amazon apple bytedance
Convert Binary Search Tree to Sorted Doubly Linked List	medium	-	amazon bloomberg databricks
Path Sum 3 - Count paths from parent to child	medium	-	amazon bloomberg facebook
Range Module	hard	-	amazon coupang google
Accounts Merge	medium	-	amazon apple bloomberg
Cherry Pickup	hard	-	adobe akuna-capital amazon
Valid Tic-Tac-Toe State	medium	-	amazon facebook google
Longest Duplicate Substring Problem	hard	-	amazon apple google