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Array (174)Sorting (45)Depth First Search (44)Tree (41)Breadth First Search (35)Linked List (28)Stack (27)Recursion (18)Graph Theory (12)Monotonic Stack (8)Queue (6)Shortest Path (2)

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Title	Difficulty	Videos	Companies
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
Word Ladder 2 - Get all the ladders	hard	-	amazon apple bloomberg
Word Ladder 1 - Get Ladder Length	hard	-	affirm amazon apple
Least Number of Perfect Squares that Sums to n	medium	-	adobe amazon apple
Serialize and Deserialize Binary Tree	hard		amazon apple bloomberg
Coin Change with Fewest Number of Coins Given Infinite Supply	medium		adobe affirm airbnb
Nested List Weight Sum 2	medium	-	didi facebook linkedin
Serialize and Deserialize Binary Search Tree BST	medium	-	amazon bytedance ebay
Vertical Order Traversal of a Binary Tree	hard	-	adobe amazon bloomberg