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aoc-racket/2016/day03b.rkt

31 lines
978 B
Racket

8 years ago
#lang br/quicklang
(require sugar/list)
(module+ reader
(provide read-syntax)
(define (read-syntax path port)
(define triads (slice-at (map string-split (string-split (port->string port) "\n")) 3))
(define new-triples
(slice-at (flatten (for/list ([triad (in-list triads)])
(apply map list triad))) 3))
(strip-bindings
#`(module mod "day03b.rkt"
#,@(for*/list ([triple (in-list new-triples)])
`(triangle ,@triple))))))
(define-macro (mb . TRIANGLES)
#'(#%module-begin
(length (filter valid-triangle? (list . TRIANGLES)))))
(provide (rename-out [mb #%module-begin]))
(define-macro (triangle A B C)
#'(list (string->number A)
(string->number B)
(string->number C)))
(provide triangle)
(define (valid-triangle? triangle)
(match-define (list a b c) triangle)
(and (> (+ a b) c)
(> (+ b c) a)
(> (+ a c) b)))