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Array (172)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
Valid Sudoku	medium		adobe amazon apple
Sudoku Solver	hard	-	adobe amazon apple
Rotate n x n matrix by 90 degrees	medium		adobe akuna-capital amazon
Spiral Matrix 1 - Return	medium		adobe amazon apple
Spiral Matrix 2 - Generate	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
Set Matrix Zeros	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
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
Paint House 1 - N houses with 3 colors with no two adjacent houses with same color color	medium	-	apple linkedin microsoft
Find the Celebrity	medium	-	amazon apple facebook
Walls and Gates	medium	-	amazon apple bloomberg
Range Sum Query 2D - Immutable	medium	-	amazon apple cruise-automation
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
Trapping Rain Water 2	hard	-	amazon apple bytedance
Pacific Atlantic Water Flow	medium		amazon apple bloomberg
Battleships in a Board	medium	-	amazon apple facebook
Construct Quad Tree	medium	-	amazon apple google
Island Perimeter	easy		amazon apple bloomberg
The Maze 1 - Can the Ball Stop at Destination	medium	-	amazon apple facebook
Diagonal Traverse	medium	-	amazon apple ebay
Longest Palindromic Subsequence 1 - Get Length	medium	-	amazon apple bloomberg
01 Matrix	medium	-	amazon apple google
Image Smoother	easy	-	amazon apple
Max Area of Island	medium	-	adobe affirm amazon
Flood Fill	easy	-	amazon apple bloomberg
Cherry Pickup	hard	-	adobe akuna-capital amazon
Toeplitz Matrix	easy	-	apple facebook google
Basic Calculator 3	hard	-	amazon apple bytedance
Transpose of a Matrix	easy	-	apple microsoft servicenow
Snakes and Ladders	medium	-	amazon apple cisco
Minimum Falling Path Sum	medium	-	amazon apple goldman-sachs
Evaluation function for Tic-Tac-Toe	easy	-	amazon apple facebook