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143 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 if there is a path between two vertices in a directed graph	easy	-	google facebook amazon
Word Search 1 - Find if word exists	medium		adobe amazon apple
Binary Tree Inorder Traversal	easy	-	alibaba amazon apple
Validate Binary Search Tree	medium		adobe amazon apple
Recover Binary Search Tree	medium	-	amazon bloomberg facebook
Same Tree	easy		amazon apple bloomberg
Symmetric Binary Tree	easy	-	adobe alibaba amazon
Maximum Depth of Binary Tree	easy		adobe amazon apple
Balanced Binary Tree	easy	-	adobe amazon apple
Path Sum 2 - find all root to leaf paths	medium	-	adobe amazon apple
Flatten binary tree to linked list in order of preorder traversal	medium	-	adobe amazon apple
Populate next pointer to right node in Perfect Binary Tree	medium	-	amazon apple bloomberg
Populate next pointer to right node in Binary Tree	medium	-	amazon bloomberg facebook
Binary Tree Path Sum - Maximum between any two nodes	hard		adobe amazon appdynamics
Sum Root to Leaf Numbers	medium	-	amazon bloomberg ebay
Surrounded Regions	medium	-	amazon ebay facebook
Clone Undirected Graph	medium		amazon apple facebook
Binary Tree Preorder Traversal	easy	-	amazon bloomberg cisco
Binary Tree Postorder Traversal	easy	-	adobe amazon facebook
Binary Tree Upside Down	medium	-	google linkedin
Binary Tree Right Side View	medium	-	adobe amazon apple
Number of Islands	medium		adobe affirm alibaba
Course Schedule 1 - Is it Possible	medium		amazon apple bloomberg
Course Schedule 2 - Get Ordered Courses	medium	-	airbnb amazon apple
Design Add and Search Words Data Structure	medium		airbnb amazon apple
Invert Binary Tree	easy		amazon apple bloomberg
Kth Smallest Element in a BST	medium		affirm amazon apple
Lowest Common Ancestor of a Binary Search Tree	medium		adobe amazon bloomberg
Lowest Common Ancestor of a Binary Tree	medium		adobe airbnb amazon
Count Univalue Subtrees	medium	-	amazon bloomberg box
Binary Tree Path - All root to leaf paths	easy	-	adobe amazon apple
Graph Valid Tree	medium		amazon facebook google
Alien Dictionary	hard		airbnb amazon apple
Closest Binary Search Tree Value	easy	-	amazon bloomberg facebook
Closest Binary Search Tree Value II	hard	-	amazon facebook forusall
Inorder Successor in Binary Search Tree	medium	-	amazon bloomberg citadel
Serialize and Deserialize Binary Tree	hard		amazon apple bloomberg
Binary Tree Longest Consecutive Sequence	medium	-	amazon facebook google
Smallest Rectangle Enclosing Black Pixels	hard	-	google
Minimum Height Trees	medium	-	amazon apple bloomberg
Binary Tree Traversal - Vertical Order Traversal	medium	-	adobe amazon bloomberg
Number of Connected Components in an Undirected Graph	medium	-	amazon facebook google
Longest Increasing Path in a Matrix	hard	-	adobe amazon apple
Reconstruct Itinerary	hard	-	amazon apple bloomberg
Largest Binary Search Tree BST Subtree	medium	-	amazon apple facebook
House Robber 3 - Houses in Binary Tree	medium	-	amazon facebook google
Flatten Nested List Iterator	medium	-	airbnb amazon apple
Water and Jug	medium	-	amazon google lyft
Find Leaves of Binary Tree	medium	-	amazon atlassian ebay
Mini Parser	medium	-	airbnb google

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