After hearing rumors saying that the almost lost art of Functional Programming could help to manage their parallel universes, the Council asked each team to send their most fervent functional programmers, and wants them to find solutions to their problems.
For decades, adepts have shared the secrets of this art under various forms. For example, the LISP world has seen the rise of the Church of Emacs (The One True Editor).
Prudent about the use of these great powers, the Council will only trust programmers with the purest (and purely functional) hearts on those serious questions. You will have to demonstrate your mastery of FP by finding solutions to the problems below.
Every problem of this competition has been written with a few unit tests and property tests. You will be given points based on the code submitted and the success of these tests.
Each problem also has an archive containing the cabal project to
work on. Please submit an archive containing the whole project with
your modifications. You can launch the script dist.sh at the
project root to recreate the archive.