After two tries with the Git shell, I used the Windows command line to create a Trac workspace.
I finally installed Trac, and it was glorious.
C:\Users\zyabin101>cd C:\Python27
C:\Python27>trac-admin C:\Python27\trac-workspace initenv
Creating a new Trac environment at C:\Python27\trac-workspace
Trac will first ask a few questions about your environment
in order to initialize and prepare the project database.
Please enter the name of your project.
This name will be used in page titles and descriptions.
"45-degree rotation" of a square matrix
code-golf matrix
Introduction
Suppose we have a square matrix with odd sidelength, like this:
0 1 2 3 4
5 6 7 8 9
0 1 2 3 4
5 6 7 8 9
0 1 2 3 4
Let's divide it into nested layers as follows:
0 1 2 3 4
+-----+
5|6 7 8|9
| +-+ |
0|1|2|3|4
| +-+ |
...
