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6 problems total

Array (1906)Sorting (442)Depth First Search (316)Database (301)Breadth First Search (241)Tree (241)Stack (172)Graph Theory (169)Linked List (81)Monotonic Stack (67)Queue (50)Recursion (48)Shortest Path (33)

All Topics(4301)Database(305)Java(0)Networking(0)Object Oriented Design(31)Programming Languages(5)System Design(0)Algorithms(3945)

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Title	Difficulty	Videos	Companies
Lexicographically Smallest Palindrome by Minimum Insertions	hard	-	quora
Serialize and Deserialize Binary Tree	hard		amazon apple bloomberg
Reaching Points	hard	-	coursera goldman-sachs google
Minimum Insertion Steps to Make a String Palindrome	hard	-	bloomberg google quora
Construct Target Array With Multiple Sums	hard	-	quora
Word Sense Disambiguation Algorithm	hard	-	quora