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32 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
Word Search 1 - Find if word exists	medium		adobe amazon apple
Validate Binary Search Tree	medium		adobe amazon apple
Same Tree	easy		amazon apple bloomberg
Symmetric Binary Tree	easy	-	adobe alibaba amazon
Maximum Depth of Binary Tree	easy		adobe amazon apple
Path Sum 2 - find all root to leaf paths	medium	-	adobe amazon apple
Clone Undirected Graph	medium		amazon apple facebook
Binary Tree Upside Down	medium	-	google linkedin
Number of Islands	medium		adobe affirm alibaba
Course Schedule 1 - Is it Possible	medium		amazon apple bloomberg
Lowest Common Ancestor of a Binary Search Tree	medium		adobe amazon bloomberg
Lowest Common Ancestor of a Binary Tree	medium		adobe airbnb amazon
Graph Valid Tree	medium		amazon facebook google
Closest Binary Search Tree Value	easy	-	amazon bloomberg facebook
Closest Binary Search Tree Value II	hard	-	amazon facebook forusall
Serialize and Deserialize Binary Tree	hard		amazon apple bloomberg
Number of Connected Components in an Undirected Graph	medium	-	amazon facebook google
Nested List Weight Sum	medium	-	amazon cloudera facebook
Flatten Nested List Iterator	medium	-	airbnb amazon apple
Nested List Weight Sum 2	medium	-	didi facebook linkedin
Find Leaves of Binary Tree	medium	-	amazon atlassian ebay
Serialize and Deserialize N-Ary Tree	hard	-	amazon apple ebay
Serialize and Deserialize Binary Search Tree BST	medium	-	amazon bytedance ebay
Find Largest Value in Each Tree Row	medium		amazon apple facebook
Number of Provinces	medium	-	adobe amazon atlassian
Print Binary Tree	medium	-	facebook linkedin microsoft
Second Minimum Node In a Binary Tree	easy	-	amazon linkedin microsoft
Accounts Merge	medium	-	amazon apple bloomberg
Is Graph Bipartite	medium	-	amazon dropbox ebay
Vertical Order Traversal of a Binary Tree	hard	-	adobe amazon bloomberg
Recover a Tree From Preorder Traversal	hard		amazon linkedin
Flower Planting With No Adjacent	medium	-	linkedin

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