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92 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
Minimum Depth of Binary Tree	easy	-	amazon apple facebook
Path Sum 1 - Check if root to leaf path exists	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
Clone Undirected Graph	medium		amazon apple facebook
Binary Tree Preorder Traversal	easy	-	amazon bloomberg cisco
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
Binary Tree Path - All root to leaf paths	easy	-	adobe amazon apple
Alien Dictionary	hard		airbnb amazon apple
Closest Binary Search Tree Value	easy	-	amazon bloomberg facebook
Inorder Successor in Binary Search Tree	medium	-	amazon bloomberg citadel
Serialize and Deserialize Binary Tree	hard		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
Flatten Nested List Iterator	medium	-	airbnb amazon apple
Water and Jug	medium	-	amazon google lyft
Evaluate Division	medium	-	adobe amazon bloomberg
Pacific Atlantic Water Flow	medium		amazon apple bloomberg
Battleships in a Board	medium	-	amazon apple facebook
Convert Binary Search Tree to Sorted Doubly Linked List	medium	-	amazon bloomberg databricks
Serialize and Deserialize N-Ary Tree	hard	-	amazon apple ebay
Flatten a Multilevel Doubly Linked List	medium	-	amazon apple bloomberg
Encode N-ary Tree to Binary Tree	hard	-	microsoft
Path Sum 3 - Count paths from parent to child	medium	-	amazon bloomberg facebook
Serialize and Deserialize Binary Search Tree BST	medium	-	amazon bytedance ebay
Island Perimeter	easy		amazon apple bloomberg

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