In case anyone is wondering what this task actually is, it's to create a square matrix where the four edges are filled with 1, while the interior is filled with 0. For example, for size = 5,
1
0
1 1 1 1 1 1 0 0 0 1 1 0 0 0 1 1 0 0 0 1 1 1 1 1 1
--Chunes (talk) 07:54, 18 February 2022 (UTC)