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day8

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master-blaster
Matthew Butterick 9 years ago
parent d5ea650a25
commit 69fdd8b2f5
11 changed files with 371 additions and 62 deletions
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4
day1.scrbl
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@ -3,7 +3,7 @@
@aoc-title[1] @aoc-title[1]
Our @link-rp["day1-input.txt"]{input} is a string of parentheses that controls an elevator. A left parenthesis @litchar{(} means go up one floor, and a right parenthesis @litchar{)} means go down. @link["http://adventofcode.com/day/1"]{The puzzle}. Our @link-rp["day1-input.txt"]{input} is a string of parentheses that controls an elevator. A left parenthesis @litchar{(} means go up one floor, and a right parenthesis @litchar{)} means go down.
@chunk[<day1> @chunk[<day1>
<day1-setup> <day1-setup>
@ -106,7 +106,7 @@ The two are similar. The choice comes down to readability and efficiency — me
basement-position)] basement-position)]
@section{Testing our input} @section{Testing Day 1}
@chunk[<day1-test> @chunk[<day1-test>
(module+ test (module+ test

4
day2.scrbl
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@ -3,7 +3,7 @@
@aoc-title[2] @aoc-title[2]
Our @link-rp["day2-input.txt"]{input} is a list of strings that represent dimensions of rectangular boxes. @link["http://adventofcode.com/day/2"]{The puzzle}. Our @link-rp["day2-input.txt"]{input} is a list of strings that represent dimensions of rectangular boxes.
@chunk[<day2> @chunk[<day2>
<day2-setup> <day2-setup>
@ -55,7 +55,7 @@ We take the same approach, with a new @racket[box->ribbon] function.
(apply + (map box->ribbon boxes)))] (apply + (map box->ribbon boxes)))]
@section{Testing our input} @section{Testing Day 2}
@chunk[<day2-test> @chunk[<day2-test>

7
day3.scrbl
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@ -3,9 +3,10 @@
@aoc-title[3] @aoc-title[3]
Our @link-rp["day3-input.txt"]{input} is a string made of the characters @litchar{^v<>} that represent north, south, west, and east. Taken together, the string represents a path through an indefinitely large grid. @link["http://adventofcode.com/day/3"]{The puzzle}. Our @link-rp["day3-input.txt"]{input} is a string made of the characters @litchar{^v<>} that represent north, south, west, and east. Taken together, the string represents a path through an indefinitely large grid.
In essence, this a two-dimensional version of the elevator problem in @secref{Day_1}.
In essence, this a two-dimensional version of the elevator problem in Day 1.
@chunk[<day3> @chunk[<day3>
<day3-setup> <day3-setup>
@ -94,7 +95,7 @@ The solution works the same as before — the only new task is to split the inpu
(append (string->cells odd-str) (string->cells even-str))))) (append (string->cells odd-str) (string->cells even-str)))))
] ]
@section{Testing our input} @section{Testing Day 3}
@chunk[<day3-test> @chunk[<day3-test>
(module+ test (module+ test

6
day4.scrbl
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@ -4,7 +4,7 @@
@aoc-title[4] @aoc-title[4]
Our @link-rp["day4-input.txt"]{input} is a string of eight characters that represents part of a key for making an MD5 hash. @link["http://adventofcode.com/day/4"]{The puzzle}. Our @link-rp["day4-input.txt"]{input} is a string of eight characters that represents part of a key for making an MD5 hash.
@chunk[<day4> @chunk[<day4>
<day4-setup> <day4-setup>
@ -16,7 +16,7 @@ Our @link-rp["day4-input.txt"]{input} is a string of eight characters that repre
We're asked to create an MD5 hash from an input key that consists of our eight-character input joined to a decimal number. The puzzle asks us to find the lowest decimal number that, when joined to our input, produces an MD5 hash that starts with five zeroes. We're asked to create an MD5 hash from an input key that consists of our eight-character input joined to a decimal number. The puzzle asks us to find the lowest decimal number that, when joined to our input, produces an MD5 hash that starts with five zeroes.
Whether or not you already know what an MD5 hash is, you can search the Racket docs and will soon find the @racketmodname[openssl/md5] module and the @racket[md5] function. Then, this puzzle is easy: starting at @racket[0], make new input keys with each integer, and stop when we find one that results in the MD5 hash we want. (The approach is similar to the second part of Day 1.) Whether or not you already know what an MD5 hash is, you can search the Racket docs and will soon find the @racketmodname[openssl/md5] module and the @racket[md5] function. Then, this puzzle is easy: starting at @racket[0], make new input keys with each integer, and stop when we find one that results in the MD5 hash we want. (The approach is similar to the second part of @secref{Day_1}.)
@chunk[<day4-setup> @chunk[<day4-setup>
@ -42,7 +42,7 @@ Exactly the same, except we test for a string of six zeroes. It is likely, howev
(define md5-hash (md5 (open-input-string md5-key))) (define md5-hash (md5 (open-input-string md5-key)))
(and (string-prefix? md5-hash "000000") i)))] (and (string-prefix? md5-hash "000000") i)))]
@section{Testing our input} @section{Testing Day 4}
@chunk[<day4-test> @chunk[<day4-test>
(module+ test (module+ test

4
day5.scrbl
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@ -3,7 +3,7 @@
@aoc-title[5] @aoc-title[5]
Our @link-rp["day5-input.txt"]{input} is a list of random-looking but not really random text strings. @link["http://adventofcode.com/day/5"]{The puzzle}. Our @link-rp["day5-input.txt"]{input} is a list of random-looking but not really random text strings.
@chunk[<day5> @chunk[<day5>
<day5-setup> <day5-setup>
@ -68,7 +68,7 @@ Again, a test of your regexp-writing skills.
(define (q2 words) (define (q2 words)
(length (filter nicer? words)))] (length (filter nicer? words)))]
@section{Testing our input} @section{Testing Day 5}
@chunk[<day5-test> @chunk[<day5-test>
(module+ test (module+ test

4
day6.scrbl
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@ -3,7 +3,7 @@
@aoc-title[6] @aoc-title[6]
Our @link-rp["day6-input.txt"]{input} is a list of instructions for turning on (or off) the bulbs in a @racket[(* 1000 1000)] grid of lights. @link["http://adventofcode.com/day/6"]{The puzzle}. Our @link-rp["day6-input.txt"]{input} is a list of instructions for turning on (or off) the bulbs in a @racket[(* 1000 1000)] grid of lights.
@chunk[<day6> @chunk[<day6>
<day6-setup> <day6-setup>
@ -126,7 +126,7 @@ Since the only part that changes between the solutions is the bulb functions, we
[else (λ(bulb) (+ bulb 2))]))) [else (λ(bulb) (+ bulb 2))])))
] ]
@section{Testing our input} @section{Testing Day 6}
@chunk[<day6-test> @chunk[<day6-test>
(module+ test (module+ test

3
day7.scrbl
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@ -3,7 +3,7 @@
@aoc-title[7] @aoc-title[7]
Our @link-rp["day7-input.txt"]{input} describes an electrical circuit, with each line of the file describing the signal provided to a particular wire. @link["http://adventofcode.com/day/7"]{The puzzle}. Our @link-rp["day7-input.txt"]{input} describes an electrical circuit, with each line of the file describing the signal provided to a particular wire.
@chunk[<day7> @chunk[<day7>
<day7-setup> <day7-setup>
@ -126,7 +126,6 @@ Ordinarily, as a safety measure, Racket won't let you redefine functions. But we
@chunk[<day7-test> @chunk[<day7-test>
(module+ test (module+ test
(define input-strs (file->lines "day7-input.txt"))
(check-equal? (q1) 46065) (check-equal? (q1) 46065)
(check-equal? (q2) 14134))] (check-equal? (q2) 14134))]

45
day7foo.rkt
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@ -1,45 +0,0 @@
#lang racket
(require racket rackunit
(for-syntax racket/base racket/file racket/string))
(define-syntax (convert-input-to-wire-functions stx)
(syntax-case stx ()
[(_)
(let* ([input-strings (file->lines "day7-input.txt")]
[wire-strings (map (λ(str) (format "(wire ~a)" str)) input-strings)]
[wire-datums (map (compose1 read open-input-string) wire-strings)])
(datum->syntax stx `(begin ,@wire-datums)))]))
(define-syntax (wire stx)
(syntax-case stx (->)
[(_ arg -> id)
#'(define (id) (get-val arg))]
[(_ op arg -> id)
#'(define (id) (op (get-val arg)))]
[(_ arg1 op arg2 -> id)
#'(define (id) (op (get-val arg1) (get-val arg2)))]
[(_ expr) #'(begin expr)]
[else #'(void)]))
(convert-input-to-wire-functions)
(require sugar/debug)
(define wire-value-cache (make-hash))
(define (get-val x)
(report x)
(if (number? x) #t #f))
(define (16bitize x)
(define 16bit-max (expt 2 16))
(define r (modulo x 16bit-max))
(if (negative? r)
(16bitize (+ 16bit-max r))
r))
(define-syntax-rule (define-16bit id proc) (define id (compose1 16bitize proc)))
(define-16bit AND bitwise-and)
(define-16bit OR bitwise-ior)
(define-16bit LSHIFT arithmetic-shift)
(define-16bit RSHIFT (λ(x y) (arithmetic-shift x (- y))))
(define-16bit NOT bitwise-not)

300
day8-input.txt
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"vcqc"
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"sig"
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"irmrebfla\xefsg\"j"
"nep"
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"\"mjagins\xf9tqykaxy\""
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54
day8.scrbl
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@ -0,0 +1,54 @@
#lang scribble/lp2
@(require scribble/manual aoc-racket/helper)
@aoc-title[8]
@link["http://adventofcode.com/day/8"]{The puzzle}. Our @link-rp["day8-input.txt"]{input} consists of a list of seemingly random strings within quotation marks.
@chunk[<day8>
<day8-setup>
<day8-q1>
<day8-q2>
<day8-test>]
@section{What's the difference between the literal length of the strings, and their length in memory?}
The puzzle relies the fact that within strings, certain single characters — like the backslash @litchar{\} and double-quote mark @litchar{"} — are described with more than one character. Thus, the question asks us to compare the two lengths.
The literal length of the string is trivial — use @racket[string-length]. The memory length requires interpreting a string as a Racket value, which (as seen in @secref{Day_7}) simply means using @racket[read].
@chunk[<day8-setup>
(require racket rackunit)
]
@chunk[<day8-q1>
(define (memory-length str) (string-length (read (open-input-string str))))
(define (q1 strs)
(- (apply + (map string-length strs)) (apply + (map memory-length strs))))]
@section{What is the difference between the re-encoded length of the literal string, and the original length?}
This question simply comes down to — do you know how to use the string-formatting functions in your programming language?
In Racket, a string can be re-encoded with @racket[~v]. Not a very puzzling puzzle overall.
@chunk[<day8-q2>
(define (encoded-length str) (string-length (~v str)))
(define (q2 strs)
(- (apply + (map encoded-length strs)) (apply + (map string-length strs)))) ]
@section{Testing Day 8}
@chunk[<day8-test>
(module+ test
(define input-strs (file->lines "day8-input.txt"))
(check-equal? (q1 input-strs) 1333)
(check-equal? (q2 input-strs) 2046))]

2
helper.rkt
Unescape Escape View File

@ -8,7 +8,7 @@
(define which-str (number->string which)) (define which-str (number->string which))
(define day-x (format "day-~a" which-str)) (define day-x (format "day-~a" which-str))
(define day-prefix (format "~a-" day-x)) (define day-prefix (format "~a-" day-x))
@title[#:style manual-doc-style #:tag-prefix day-prefix]{@link[@string-append["http://adventofcode.com/day/" @which-str]]{Day @which-str}}) @title[#:style manual-doc-style]{Day @which-str})
(define-syntax (link-rp stx) (define-syntax (link-rp stx)
(syntax-case stx () (syntax-case stx ()