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20 problems total

Array (184)Sorting Algorithms (48)Depth First Search (46)Tree (42)Breadth First Search (36)Linked List (30)Stack (29)Recursion (18)Graph Theory (13)Monotonic Stack (10)Queue (7)Shortest Path (3)

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Title	Difficulty	Videos	Companies
Validate Binary Search Tree	medium		adobe amazon apple
Binary Tree Level Order Traversal - Level by Level	medium		adobe amazon apple
Binary Tree Traversal - Zigzag Level Order Traversal	medium	-	amazon apple bloomberg
Sum Root to Leaf Numbers	medium	-	amazon bloomberg ebay
Binary Search Tree BST Inorder Iterator	medium	-	alibaba amazon apple
Binary Tree Right Side View	medium	-	adobe amazon apple
Lowest Common Ancestor of a Binary Tree	medium		adobe airbnb amazon
Count Univalue Subtrees	medium	-	amazon bloomberg box
Serialize and Deserialize Binary Tree	hard		amazon apple bloomberg
Flatten Nested List Iterator	medium	-	airbnb amazon apple
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
Boundary of Binary Tree	medium	-	adobe amazon apple
Subtree of Another Tree	easy		amazon bloomberg ebay
Maximum Width of Binary Tree	medium	-	amazon bloomberg ebay
Kth Largest Element in a Stream	easy		adobe amazon apple
Flip Equivalent Binary Trees	medium		amazon ebay google
Binary Tree Cameras	hard	-	ebay facebook google
Relative Sort Array	easy		amazon de-shaw ebay