## Question 1
Given a matrix, `mat` = [[0, 0, 0], [0, 1, 0], [1, 0, 0]], find the matrix that contains the distance of the nearest 0 for each cell.
### Options

1. [[0, 0, 0], [0, 0, 0], [0, 0, 0]]
Incorrect
From cell (1, 1), we have to move one cell in any direction to get to the closest 0.
----------------------------

2. [[0, 0, 0], [0, 1, 0], [1, 0, 0]]
Correct
From cell (1, 1), we have to move one cell in any direction to reach the closest 0. This is the same for cell (2, 0).
----------------------------

3. [[0, 1, 0], [0, 1, 0], [0, 1, 0]]
Incorrect
Cell (0, 1) in the input is itself 0, so we don’t need to move to a different cell to find a 0.
----------------------------

4. [[1, 0, 1], [0, 1, 0], [1, 0, 1]]
Incorrect
Cell (0, 0) in the input is itself 0, so we don’t need to move to a different cell to find a 0.
----------------------------

---------------------------------------------

## Question 2
Given a matrix, `mat` = [[0, 0, 0], [0, 1, 0], [1, 1, 1]], find the matrix that contains the distance of the nearest 0 for each cell.
### Options

1. [[0, 0, 0], [0, 1, 0], [1, 2, 1]]
Correct
This is correct.
----------------------------

2. [[0, 2, 0], [0, 1, 1], [1, 2, 1]]
Incorrect
Cell (0, 1) in the input is itself 0, so we don’t need to move to a different cell to find a 0.
----------------------------

3. [[0, 0, 0], [0, 1, 0], [1, 1, 1]]
Incorrect
From cell (2, 1), we have to move two cells in any direction to get to the nearest 0.
----------------------------

4. [[1, 2, 0], [1, 1, 1], [1, 1, 2]]
Incorrect
Cell (0, 0) in the input is itself 0, so we don’t need to move to a different cell to find a 0.
----------------------------

---------------------------------------------

## Question 3
Given a matrix, `mat` = [[0, 0, 1], [1, 1, 1], [1, 0, 1]], find the matrix that contains the distance of the nearest 0 for each cell.
### Options

1. [[0, 0, 0], [0, 1, 0], [1, 2, 1]]
Incorrect
Cell (2, 1) in the input is itself 0, so we don’t need to move to a different cell to find a 0.
----------------------------

2. [[0, 0, 1], [0, 1, 1], [1, 2, 1]]
Incorrect
From cell (1, 0), we have to move one cell above to get to the closest 0.
----------------------------

3. [[0, 0, 1], [1, 1, 2], [1, 0, 1]]
Correct
This is correct.
----------------------------

4. [[0, 0, 0], [0, 0, 0], [0, 0, 0]]
Incorrect
From cell (0, 2), we have to move one cell to the left to get to the closest 0.
----------------------------

---------------------------------------------