Parson's programming puzzles

[nthiery]

Parsons programming puzzles are a type of scaffolded program construction tasks where the learner is given a set of code fragments, blocks of a single or multiple lines of code, and the task is to piece together a program from these. Some references:

• A teaching: paper: http://crpit.com/confpapers/CRPITV52Parsons.pdf
• An online exercise: http://parsons.problemsolving.io/
• A javascript library: https://github.com/js-parsons/js-parsons

That could be an idea of exercise type for PremierLanguage. As a first crude approximation, we could add a line order randomizer in cpp-info111, with a syntax such as:

RANDOM_LINE_ORDER(
for (int i=0; i<t.size(); i++) {
    if ( x == t[i] )
         return true
return false

cc: @HuxoD142, @hivert

[nthiery]

Accidental duplicate of #26 (network failure in the middle of the submission)