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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)

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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
Same Tree	easy		amazon apple bloomberg
Symmetric Binary Tree	easy	-	adobe alibaba amazon
Binary Tree Level Order Traversal - Level by Level	medium		adobe amazon apple
Binary Tree Traversal - Zigzag Level Order Traversal	medium	-	amazon apple bloomberg
Maximum Depth of Binary Tree	easy		adobe amazon apple
Binary Tree Traversal - Level Order Bottom up	medium	-	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
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
Word Ladder 2 - Get all the ladders	hard	-	amazon apple bloomberg
Word Ladder 1 - Get Ladder Length	hard	-	affirm amazon apple
Surrounded Regions	medium	-	amazon ebay facebook
Clone Undirected Graph	medium		amazon apple facebook
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
Invert Binary Tree	easy		amazon apple bloomberg
Graph Valid Tree	medium		amazon facebook google
Alien Dictionary	hard		airbnb amazon apple
Least Number of Perfect Squares that Sums to n	medium	-	adobe amazon apple
Walls and Gates	medium	-	amazon apple bloomberg
Serialize and Deserialize Binary Tree	hard		amazon apple bloomberg
Remove Invalid Parentheses Problem	hard	-	amazon apple bloomberg
Minimum Height Trees	medium	-	amazon apple bloomberg
Binary Tree Traversal - Vertical Order Traversal	medium	-	adobe amazon bloomberg
Shortest Distance from All Buildings	hard	-	amazon bytedance facebook
Coin Change with Fewest Number of Coins Given Infinite Supply	medium		adobe affirm airbnb
Number of Connected Components in an Undirected Graph	medium	-	amazon facebook google
Longest Increasing Path in a Matrix	hard	-	adobe amazon apple
Nested List Weight Sum	medium	-	amazon cloudera facebook
Water and Jug	medium	-	amazon google lyft
Evaluate Division	medium	-	adobe amazon bloomberg
Sum of Left Leaves	easy		adobe amazon bloomberg
Trapping Rain Water 2	hard	-	amazon apple bytedance
Pacific Atlantic Water Flow	medium		amazon apple bloomberg
Serialize and Deserialize N-Ary Tree	hard	-	amazon apple ebay
N-ary Tree Level Order Traversal	medium	-	amazon
Minimum Genetic Mutation	medium	-	amazon google twitter
Serialize and Deserialize Binary Search Tree BST	medium	-	amazon bytedance ebay
Island Perimeter	easy		amazon apple bloomberg
The Maze 1 - Can the Ball Stop at Destination	medium	-	amazon apple facebook
The Maze 2 - Shortest Distance	medium	-	amazon facebook google
Find Largest Value in Each Tree Row	medium		amazon apple facebook
Minesweeper	medium	-	amazon bloomberg cruise-automation
Minimum Absolute Difference in BST	easy	-	amazon apple google
01 Matrix	medium	-	amazon apple google
Number of Provinces	medium	-	adobe amazon atlassian

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