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day4.rkt
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#lang racket
(require racket/string)
(define (parse-byr v)
(writeln v)
(if (regexp-match? #rx"^[0-9]+$" v)
(let ([num (cadr (regexp-match #rx"^0*([1-9][0-9]*)$" v))])
(and (>= (string->number num 10) 1920) (<= (string->number num 10) 2002)))
false))
(define (parse-iyr v)
(if (regexp-match? #rx"^[0-9]+$" v)
(let ([num (cadr (regexp-match #rx"^0*([1-9][0-9]*)$" v))])
(and (>= (string->number num 10) 2010) (<= (string->number num 10) 2020)))
false))
(define (parse-eyr v)
(if (regexp-match? #rx"^[0-9]+$" v)
(let ([num (cadr (regexp-match #rx"^0*([1-9][0-9]*)$" v))])
(and (>= (string->number num 10) 2020) (<= (string->number num 10) 2030)))
false))
(define (parse-hgt v)
(if (regexp-match? #rx"[0-9]+(in|cm)" v)
(let ([parsed (regexp-match #rx"([0-9]+)(in|cm)" v)])
(cond [(equal? "in" (caddr parsed))
(and (>= (string->number (cadr parsed) 10) 59)
(<= (string->number (cadr parsed) 10) 76))]
[(equal? "cm" (caddr parsed))
(and (>= (string->number (cadr parsed) 10) 150)
(<= (string->number (cadr parsed) 10) 193))]))
false))
(define (parse-hcl v)
(if (regexp-match? #rx"#[0-9a-f]+" v)
(let ([m (cadr (regexp-match #rx"#([0-9a-f]+)" v))])
(if (eq? 6 (string-length m))
true
false))
false))
(define (parse-ecl v)
(if (regexp-match? #rx"amb|blu|brn|gry|grn|hzl|oth" v)
true
false))
(define (parse-pid v)
(if (regexp-match #rx"[0-9]+" v)
(let ([m (car (regexp-match #rx"[0-9]+" v))])
(if (eq? 9 (string-length m))
true
false))
false))
;; pass is a vector of 9 elements
(define (add-field-to-passport f pass)
(match (car f)
["byr" (if (eq? 1 (vector-ref pass 1))
(vector-set! pass 0 0)
(if (parse-byr (cadr f))
(vector-set! pass 1 1)
(vector-set! pass 0 0)))]
["iyr" (if (eq? 1 (vector-ref pass 2))
(vector-set! pass 0 0)
(if (parse-iyr (cadr f))
(vector-set! pass 2 1)
(vector-set! pass 0 0)))]
["eyr" (if (eq? 1 (vector-ref pass 3))
(vector-set! pass 0 0)
(if (parse-eyr (cadr f))
(vector-set! pass 3 1)
(vector-set! pass 0 0)))]
["hgt" (if (eq? 1 (vector-ref pass 4))
(vector-set! pass 0 0)
(if (parse-hgt (cadr f))
(vector-set! pass 4 1)
(vector-set! pass 0 0)))]
["hcl" (if (eq? 1 (vector-ref pass 5))
(vector-set! pass 0 0)
(if (parse-hcl (cadr f))
(vector-set! pass 5 1)
(vector-set! pass 0 0)))]
["ecl" (if (eq? 1 (vector-ref pass 6))
(vector-set! pass 0 0)
(if (parse-ecl (cadr f))
(vector-set! pass 6 1)
(vector-set! pass 0 0)))]
["pid" (if (eq? 1 (vector-ref pass 7))
(vector-set! pass 0 0)
(if (parse-pid (cadr f))
(vector-set! pass 7 1)
(vector-set! pass 0 0)))]
["cid" (if (eq? 1 (vector-ref pass 8))
(vector-set! pass 0 0)
(vector-set! pass 8 1))])
pass)
(define (parse-input in)
(let ([passes (regexp-split #rx" " in)])
(writeln (length passes))
(for/list ([pass passes])
(let ([fields (regexp-split #rx" " pass)])
(for/list ([f fields])
(regexp-split #rx":" f))))))
(define (solve1 f)
(let* ([lines (string-join
(for/list ([l (in-lines f)]) l))]
[parsed (parse-input lines)]
[passes (for/list ([passport parsed])
(let ([newpass (vector 1 0 0 0 0 0 0 0 0)])
(foldl add-field-to-passport newpass passport)))])
(for/fold ([cnt 0])
([pass passes])
(writeln pass)
(if (or (eq? 0 (vector-ref pass 0))
(eq? 0 (vector-ref pass 1))
(eq? 0 (vector-ref pass 2))
(eq? 0 (vector-ref pass 3))
(eq? 0 (vector-ref pass 4))
(eq? 0 (vector-ref pass 5))
(eq? 0 (vector-ref pass 6))
(eq? 0 (vector-ref pass 7)))
(+ cnt 1)
cnt))))
(call-with-input-file "day4_in.txt"
(lambda (f)
(solve1 f)))