🎄⌨️ Advent of Code 2018: Check-in [35dfec]

Overview

Comment:	Add Day 2 input and solutions
Downloads:	Tarball \| ZIP archive \| SQL archive
Timelines:	family \| ancestors \| descendants \| both \| trunk
Files:	files \| file ages \| folders
SHA3-256:	35dfec6e8d276550930d6f4dc055796be5ce750bf9c09a1500f4768328dd2359
User & Date:	joel on 2018-12-02 17:26:22
Other Links:	manifest \| tags

Context

2018-12-03
20:27		Add Day 3 input check-in: a68afe user: joel tags: trunk
2018-12-02
17:26		Add Day 2 input and solutions check-in: 35dfec user: joel tags: trunk
2018-12-01
23:16		Day 1 solutions (both parts) check-in: 6b74a1 user: joel tags: trunk

Changes

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Added day02-input.txt version [b9a78c].

Added day02.rkt version [200b66].


























































































































































































































































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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 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66	+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +	#lang racket (require rackunit) (define input (file->lines "day02-input.txt")) ;; Returns hash table where keys are unique chars in str, ;; values are # of occurrences of that char in str (define (check-id str) (for/fold ([seen (hash)]) ([c (in-list (string->list str))]) (hash-set seen c (add1 (hash-ref seen c 0))))) ;; Returns hash table where keys are numbers, values are counts of ;; how many ids in id-list that have a character that repeats exactly ;; [key] times (define (id-counts id-list) (for/fold ([counts (hash)]) ([id (in-list id-list)]) (for/fold ([each-count counts]) ([c (in-list (remove-duplicates (hash-values (check-id id))))]) (hash-set each-count c (add1 (hash-ref each-count c 0)))))) (define (day01-part1 id-list) (define counts (id-counts id-list)) (* (hash-ref counts 2 0) (hash-ref counts 3 0))) (module+ test (define test-ids '("abcdef" "bababc" "abbcde" "abcccd" "aabcdd" "abcdee" "ababab")) (check-equal? (day01-part1 test-ids) 12) (check-equal? (day01-part1 input) 7533)) ; Correct answer for part 1 (define part2-example '("abcde" "fghij" "klmno" "pqrst" "fguij" "axcye" "wvxyz")) ;; Returns a list of characters at positions where id1 and id2 match (define (compare-box-ids id1 id2) (define id1-chars (string->list id1)) (define id2-chars (string->list id2)) (filter identity (for/list ([i (in-range (length id1-chars))]) (if (equal? (list-ref id1-chars i) (list-ref id2-chars i)) (list-ref id1-chars i) #f)))) (define (day02-part2 ids) (define (is-match? comparison-chars) (equal? (length comparison-chars) (sub1 (string-length (first ids))))) (define matches (filter is-match? (map (curry compare-box-ids (first ids)) (rest ids)))) (if (not (empty? matches)) (list->string (first matches)) (day02-part2 (rest ids)))) (module+ test (check-equal? (day02-part2 part2-example) "fgij") (check-equal? (day02-part2 input) "mphcuasvrnjzzkbgdtqeoylva")) ; Correct answer for part 2