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38 problems total

Array (1906)Sorting (442)Depth First Search (316)Database (301)Breadth First Search (241)Tree (241)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(3945)

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Title	Difficulty	Videos	Companies
Autocomplete Suggestion System	medium	-	twitter
Find if Path Exists in Directed Graph	easy	-
Find if there is a path between two vertices in a directed graph	easy	-	google facebook amazon
Find the Shortest Path between 2 cells in boolean maze	easy	-	google
Lee's Algorithm	medium	-
Minimum number of edges between two vertices of a Graph	easy	-
Path With Minimum Effort	medium	-
Rotting Oranges	medium	-
Validate Binary Search Tree	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 1 - Get Ladder Length	hard	-	affirm amazon apple
Word Break 1 - Check if word is breakable	medium		adobe amazon apple
Number of Islands	medium		adobe affirm alibaba
Least Number of Perfect Squares that Sums to n	medium	-	adobe amazon apple
Pacific Atlantic Water Flow	medium		amazon apple bloomberg
Island Perimeter	easy		amazon apple bloomberg
01 Matrix	medium	-	amazon apple google
Open the Lock	medium	-	amazon bloomberg facebook
Letter Case Permutation	medium	-	amazon bloomberg facebook
Bus Routes	hard	-	amazon didi google
Keys and Rooms	medium	-	amazon google
Shortest Path to Get All Keys	hard	-	airbnb amazon google
Snakes and Ladders	medium	-	amazon apple cisco
Shortest Bridge	medium	-	facebook google mckinsey
Flip Equivalent Binary Trees	medium		amazon ebay google
Cousins in Binary Tree	easy	-	adobe amazon bloomberg
Shortest Path in Binary Matrix	medium	-	amazon facebook google
Maximum Level Sum of a Binary Tree	medium	-	amazon google
Path with Maximum Gold	medium		amazon facebook goldman-sachs
Minimum Number of Days to Disconnect Island	hard
Find if Path Exists in Graph	easy
The Time When the Network Becomes Idle	medium	-
All Ancestors of a Node in a Directed Acyclic Graph	medium
Kth Largest Sum in a Binary Tree	medium
Cousins in Binary Tree 2	medium
Find the Safest Path in a Grid	medium
Level of Binary Tree with minimum sum	medium	-