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