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16 lines
518 B
Racket
16 lines
518 B
Racket
7 years ago
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#lang reader "../aoc-lang.rkt"
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7 years ago
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(provide (rename-out [#%mb #%module-begin]))
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(define-macro (#%mb (STARS) (WORD ...) ...)
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#'(#%module-begin
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(for/sum ([ws (in-list '((WORD ...) ...))]
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#:when (no-duplicates? ws #:anagrams? (eq? 'STARS '★★)))
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1)))
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(define (sort-chars word)
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(sort (string->list (symbol->string word)) char<?))
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(define (no-duplicates? ws #:anagrams? [anagrams #f])
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(let ([ws (if anagrams (map sort-chars ws) ws)])
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(= (length ws) (length (remove-duplicates ws)))))
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