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31 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
Valid Sudoku	medium	-	adobe amazon apple
Rotate n x n matrix by 90 degrees	medium		adobe akuna-capital amazon
Spiral Matrix 1 - Return	medium		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
Minimum Path Sum in matrix	medium	-	adobe amazon apple
Search a 2D Matrix 1 - Elements sorted row-wise and first integer of each row is greater than last element of previous row is greater than last element of previous row	medium	-	adobe amazon apple
Word Search 1 - Find if word exists	medium		adobe amazon apple
Maximal Rectangle	hard	-	adobe amazon bloomberg
Number of Islands	medium		adobe affirm alibaba
Word Search 2 - Return All Words	hard		airbnb amazon apple
Maximal Square	medium	-	adobe airbnb amazon
Search a 2D Matrix 2 - Rows and columns are sorted	medium	-	adobe amazon apple
Walls and Gates	medium	-	amazon apple bloomberg
Game of Life	medium	-	amazon bloomberg dropbox
Sparse Matrix Multiplication	medium	-	amazon apple bloomberg
Longest Increasing Path in a Matrix	hard	-	adobe amazon apple
Design Tic-Tac-Toe	medium	-	amazon apple bloomberg
Kth Smallest Element in a Sorted Matrix	medium	-	adobe amazon apple
Pacific Atlantic Water Flow	medium		amazon apple bloomberg
Valid Word Square	easy	-	bloomberg google
Island Perimeter	easy		amazon apple bloomberg
Longest Palindromic Subsequence 1 - Get Length	medium	-	amazon apple bloomberg
Minesweeper	medium	-	amazon bloomberg cruise-automation
Max Area of Island	medium	-	adobe affirm amazon
Candy Crush	medium	-	bloomberg facebook google
Flood Fill	easy	-	amazon apple bloomberg
Contain Virus	hard	-	bloomberg
Two City Scheduling	medium	-	amazon bloomberg facebook
Remove All Adjacent Duplicates in String 2	medium	-	bloomberg facebook factset
Minimum Remove to Make Valid Parentheses	medium	-	amazon bloomberg bytedance