To enhance its "retro" feel, I decided to solve this year's problems on a 15-year-old old laptop (an AsusTek 1000HE, single core 1.6 GHz CPU, 800 MB RAM), with a 32-bit Alpine Linux installed, but without X11 - only in text mode. Not 80x25 though, but 102x33, using the 18pt bold Terminus console font.
The only tools used are links (to access the problems), vim
(to write the code), tcl (to run the code), and rlwrap (for
a bit of comfort in tclsh).
To run the Tcl solutions, you need to first source
readlines.tcl, and define a global Boolean variable part2,
which is false for Part 1 and true for Part 2. Or just use
the run script.
Some solutions were quite slow and were translated into a statically typed compiled language (SML or C/C++), see the Hall of Shame.