Install Perl 5.20 on macOS
Codeforces support perl 5.20 and the perl version on macOS is 5.18. So I want to install perl 5.20 on macOS. There is a installation management toll for perl. It is Perlbrew.
Just follow the homepage of the Perlbrew to install it:
Then install perl 5.20:
perlbrew install perl-5.20.0
Now, I can switch to perl 5.20 easily:
perlbrew switch perl-5.20.0