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21 problems total
| Title | Difficulty | Videos | Companies |
|---|---|---|---|
| Chess King Check Detector | hard | - | |
| Valid Sudoku | medium | ||
| Sudoku Solver | hard | - | |
| Spiral Matrix 1 - Return | medium | ||
| Spiral Matrix 2 - Generate | medium | ||
| Unique Paths in Grid 1 - Count all paths moving right or down | medium | ||
| Set Matrix Zeros | medium | ||
| Word Search 1 - Find if word exists | medium | ||
| Number of Islands | medium | ||
| Word Search 2 - Return All Words | hard | ||
| Maximal Square | medium | - | |
| Search a 2D Matrix 2 - Rows and columns are sorted | medium | - | |
| Game of Life | medium | - | |
| Number of Islands II | hard | - | |
| Pacific Atlantic Water Flow | medium | ||
| The Maze 2 - Shortest Distance | medium | - | |
| Minesweeper | medium | - | |
| Max Area of Island | medium | - | |
| Cherry Pickup | hard | - | |
| Valid Tic-Tac-Toe State | medium | - | |
| Lucky Numbers in a Matrix | easy |