Set Difficulty Levels for exercises.

[verdammelt]

Right now they are all set at 1.

ref discussion in #121

[verdammelt]

To me it is obvious that an exercise like leap-year is difficulty 1. grains may be a 1 or more (if you know the math it is easy, otherwise you are going to write an interative/recursive algorithm). Something like grade-school and crypto-square are definitely not difficulty 1 - but are they 10?, 5?

[verdammelt]

The sizes of existing example implementations sorted from smallest to largest:

((135 "roman-numerals/example.lisp")
 (189 "grains/example.lisp")
 (273 "leap/example.lisp")
 (304 "hamming/example.lisp")
 (319 "triangle/example.lisp")
 (320 "binary/example.lisp")
 (331 "difference-of-squares/example.lisp")
 (352 "gigasecond/example.lisp")
 (366 "anagram/example.lisp")
 (410 "strain/example.lisp")
 (456 "rna-transcription/example.lisp")
 (458 "etl/example.lisp")
 (598 "bob/example.lisp")
 (610 "nucleotide-count/example.lisp")
 (639 "raindrops/example.lisp")
 (663 "scrabble-score/example.lisp")
 (762 "robot-name/example.lisp")
 (784 "sieve/example.lisp")
 (817 "space-age/example.lisp")
 (867 "atbash-cipher/example.lisp")
 (933 "word-count/example.lisp")
 (938 "grade-school/example.lisp")
 (939 "allergies/example.lisp")
 (943 "trinary/example.lisp")
 (990 "phone-number/example.lisp")
 (1133 "beer-song/example.lisp")
 (1302 "crypto-square/example.lisp")
 (1394 "meetup/example.lisp")
 (1486 "prime-factors/example.lisp"))

Can this be used as a proxy for difficulty? At least as a first pass?

[stale]

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