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28 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
Fisher-Yates Shuffle	medium	-	facebook
Remove Nth Node From End of List	medium		adobe amazon apple
Generate Parentheses	medium	-	adobe alibaba amazon
Search in Rotated Sorted Array	medium		adobe alibaba amazon
Rotate n x n matrix by 90 degrees	medium		adobe akuna-capital amazon
N-Queens	hard	-	adobe amazon apple
Unique Paths in Grid 1 - Count all paths moving right or down	medium		adobe alibaba amazon
Unique Paths in Grid 2 - Count all paths moving right or down with obstacles	medium	-	amazon apple bloomberg
Set Matrix Zeros	medium		adobe amazon apple
Subsets 1	medium		adobe amazon apple
Merge Two Sorted Arrays	easy	-	adobe amazon apple
Convert Sorted Array to height-balanced Binary Search Tree	easy		airbnb amazon apple
Balanced Binary Tree	easy	-	adobe amazon apple
Min Stack	medium	-	adobe amazon apple
Number of trailing zeros in a factorial	medium	-	amazon bloomberg facebook
Delete non-tail Node in linked list, Given only access to that Node	medium		adobe amazon apple
Search a 2D Matrix 2 - Rows and columns are sorted	medium	-	adobe amazon apple
Valid Anagram	easy		amazon apple bloomberg
Integer to English Words	hard		amazon apple barclays
Expression Add Operators	hard	-	apple bytedance facebook
Find Median from Data Stream	hard		adobe amazon apple
Bulb Switcher	medium	-	amazon facebook mathworks
Reverse String	easy		adobe amazon apple
Generate Nth Fibonacci Number	easy		amazon apple barclays
Subtree of Another Tree	easy		amazon bloomberg ebay
Flood Fill	easy	-	amazon apple bloomberg
Evaluation function for Tic-Tac-Toe	easy	-	amazon apple facebook