blob: 3c7db8943b1e81ef349f41ed921e71107b985efd (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
|
#lang racket
(require "../../jj-aoc.rkt"
threading)
(define passports
(~> (open-day 4 2020)
(port->string)
(string-split "\n\n")
(map (λ~> (string-replace "\n" " ")) _)))
;; part 1
(define required-fields
(list "byr:"
"iyr:"
"eyr:"
"hgt:"
"hcl:"
"ecl:"
"pid:"))
(define (valid-passport? p)
(andmap (λ (s) (string-contains? p s)) required-fields))
(count valid-passport? passports)
;; part 2
(define passport-fields
(for/list ([p (in-list passports)]
#:when (valid-passport? p))
(~> p
string-split
(map (curryr string-split ":") _)
flatten
(apply hash _))))
(define (valid-byr p)
(define year (string->number (hash-ref p "byr")))
(and (<= year 1920)
(>= year 2002)))
(define (valid-iyr p)
(define year (string->number (hash-ref p "iyr")))
(and (<= year 2010)
(>= year 2020)))
(define (valid-eyr p)
(define year (string->number (hash-ref p "iyr")))
(and (<= year 2020)
(>= year 2030)))
|
