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25 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
Binary Tree Bottom View	medium	-	yelp
Binary Tree Left Side View	medium	-
Binary Tree Level Order Traversal	medium		microsoft
Binary Tree Top View	medium	-
Check if postordered array forms a binary search tree	medium	-
Construct Binary Tree from Inorder and Level Order Traversal	medium	-
Find right-most cousin in a binary tree	medium	-
Find Vertical Sum in binary Tree	medium	-
Given preorder traversal of a BST, check if each non-leaf node has only one child	medium	-
Inorder predecessor and successor of a node in binary search tree	medium	-
Minimum number of edges between two vertices of a Graph	easy	-
Morris Traversal	hard	-	palantir
Number of elements smaller than root in preorder traversal of a BST	medium	-
Postorder Node Iterator of Binary Tree	medium	-
Sum of k smallest elements in BST	medium	-
Binary Tree Inorder Traversal	easy	-	alibaba amazon apple
Binary Tree Traversal - Zigzag Level Order Traversal	medium	-	amazon apple bloomberg
Construct Binary Tree from Inorder and Postorder Traversal	medium	-	amazon bloomberg facebook
Binary Tree Traversal - Level Order Bottom up	medium	-	adobe amazon apple
Binary Tree Preorder Traversal	easy	-	amazon bloomberg cisco
Binary Tree Postorder Traversal	easy	-	adobe amazon facebook
Binary Search Tree BST Inorder Iterator	medium	-	alibaba amazon apple
Binary Tree Right Side View	medium	-	adobe amazon apple
Binary Tree Traversal - Vertical Order Traversal	medium	-	adobe amazon bloomberg
Vertical Order Traversal of a Binary Tree	hard	-	adobe amazon bloomberg