Recap - Matrix Operations

Read n from input, the size of a square matrix. Build an n × n matrix where each cell at row r, column c equals r + c.

Then print, on separate lines:

1. The matrix using inspect on the outer array
2. The sum of all cells
3. The maximum value on the main diagonal
4. The transpose using inspect

For input 3, the output is:

[[0, 1, 2], [1, 2, 3], [2, 3, 4]]
18
4
[[0, 1, 2], [1, 2, 3], [2, 3, 4]]

(For this construction, the matrix happens to equal its own transpose.)