2046 lines
78 KiB
Org Mode
2046 lines
78 KiB
Org Mode
# -*- geiser-scheme-implementation: chicken -*-
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#+TITLE: Advent Of Code with Chicken Scheme
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#+AUTHOR: Daniel Ziltener
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#+PROPERTY: header-args:scheme :session *chicken*
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* Prelude
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I don't know why I am spending my time this way, but I am trying to get through this year's
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[[https://adventofcode.com/][Advent of Code]]. I decided to use [[https://call-cc.org][Chicken Scheme]], and I am trying to use as few (if any) extensions,
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for an extra challenge.
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* Day 1: Trebuchet?!
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** Part One
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*** Quest
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Something is wrong with global snow production, and you've been selected to take a look. The Elves
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have even given you a map; on it, they've used stars to mark the top fifty locations that are likely
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to be having problems.
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You've been doing this long enough to know that to restore snow operations, you need to check all
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*fifty stars* by December 25th.
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Collect stars by solving puzzles. Two puzzles will be made available on each day in the Advent
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calendar; the second puzzle is unlocked when you complete the first. Each puzzle grants *one
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star*. Good luck!
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You try to ask why they can't just use a [[https://adventofcode.com/2015/day/1][weather machine]] ("not powerful enough") and where they're
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even sending you ("the sky") and why your map looks mostly blank ("you sure ask a lot of questions")
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and hang on did you just say the sky ("of course, where do you think snow comes from") when you
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realize that the Elves are already loading you into a [[https://en.wikipedia.org/wiki/Trebuchet][trebuchet]] ("please hold still, we need to
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strap you in").
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As they're making the final adjustments, they discover that their calibration document (your puzzle
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input) has been *amended* by a very young Elf who was apparently just excited to show off her art
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skills. Consequently, the Elves are having trouble reading the values on the document.
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The newly-improved calibration document consists of lines of text; each line originally contained a
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specific *calibration value* that the Elves now need to recover. On each line, the calibration value
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can be found by combining the *first digit* and the *last digit* (in that order) to form a single
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*two-digit number*.
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For example:
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#+begin_example
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1abc2
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pqr3stu8vwx
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a1b2c3d4e5f
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treb7uchet
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#+end_example
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In this example, the calibration values of these four lines are =12=, =38=, =15=, and =77=. Adding
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these together produces =142=.
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Consider your entire calibration document. *What is the sum of all of the calibration values?*
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*** Puzzle Solution
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:PROPERTIES:
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:ID: day1-puzzle-solution-1
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:END:
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#+NAME: day1-solution-1
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#+begin_src scheme :var input=day1-input :results output drawer
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(import (chicken string)
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(chicken irregex))
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(let ((lines (string-split input "\n")))
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(foldl + 0
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(map
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(lambda (line)
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(let ((digits (irregex-extract '(/ #\0 #\9) line)))
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(if (= 0 (length digits))
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0
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(let ((first-digit (car digits))
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(last-digit (car (reverse digits))))
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(string->number (string-append first-digit last-digit))))))
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lines)))
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#+end_src
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#+RESULTS: day1-solution-1
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:results:
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Error: unbound variable: geiser#geiser-eval
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Call history:
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<syntax> (geiser#geiser-eval (quote #f) (quote (begin (let ((input (quote "eightqrssm9httwogqshfxninepnfrppfz...
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<syntax> (quote #f)
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<syntax> (##core#quote #f)
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<syntax> (quote (begin (let ((input (quote "eightqrssm9httwogqshfxninepnfrppfzhsc\none111jxlmc7tvklrmhdpsix\n...
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<syntax> (##core#quote (begin (let ((input (quote "eightqrssm9httwogqshfxninepnfrppfzhsc\none111jxlmc7tvklrmh...
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<eval> (geiser#geiser-eval (quote #f) (quote (begin (let ((input (quote "eightqrssm9httwogqshfxninepnfrppfz... <--
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#;2>
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:end:
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** Part Two
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*** Quest
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Your calculation isn't quite right. It looks like some of the digits are actually *spelled out with
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letters*: =one=, =two=, =three=, =four=, =five=, =six=, =seven=, =eight=, and =nine= *also* count as
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valid "digits".
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Equipped with this new information, you now need to find the real first and last digit on each
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line. For example:
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#+begin_example
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two1nine
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eightwothree
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abcone2threexyz
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xtwone3four
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4nineeightseven2
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zoneight234
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7pqrstsixteen
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#+end_example
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In this example, the calibration values are =29=, =83=, =13=, =24=, =42=, =14=, and =76=. Adding
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these together produces =281=.
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*What is the sum of all of the calibration values?*
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*** Puzzle Solution
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#+NAME: day1-solution-2
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#+begin_src scheme
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(import (chicken string)
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(chicken irregex))
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(define (extract-digits input-string)
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(irregex-extract '(or (/ #\0 #\9)
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"one"
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"two"
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"three"
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"four"
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"five"
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"six"
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"seven"
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"eight"
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"nine"
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; Duplicates
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"twone"
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"eightwo"
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"nineight"
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"eighthree"
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"threeight"
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"fiveight"
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"oneight"
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"sevenine")
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input-string))
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(define (translate-code digit)
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(case (string->symbol digit)
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((|0|) "0")
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((|1| one) "1")
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((|2| two) "2")
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((|3| three) "3")
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((|4| four) "4")
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((|5| five) "5")
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((|6| six) "6")
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((|7| seven) "7")
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((|8| eight) "8")
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((|9| nine) "9")
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; Again, duplicates
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((twone) "21")
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((eightwo) "82")
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((nineight) "98")
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((eighthree) "83")
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((threeight) "38")
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((fiveight) "58")
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((oneight) "18")
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((sevenine) "79")
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))
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(let ((lines (string-split input "\n")))
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(foldl + 0
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(map
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(lambda (line)
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(let ((digits (string->list
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(foldl string-append ""
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(map translate-code (extract-digits line))))))
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(if (= 0 (length digits))
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0
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(let ((first-digit (car digits))
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(last-digit (car (reverse digits))))
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(string->number (string first-digit last-digit))))))
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lines)))
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#+end_src
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#+RESULTS: day1-solution-2
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: 53866
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** Puzzle Input
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Jump to [[#headline-10][day 2]].
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#+NAME: day1-input
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#+begin_example
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eightqrssm9httwogqshfxninepnfrppfzhsc
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one111jxlmc7tvklrmhdpsix
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bptwone4sixzzppg
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ninezfzseveneight5kjrjvtfjqt5nineone
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58kk
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5b32
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1dtwo
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six7two7sixtwo78
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mvhsixpptztjh13sixthree2
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six1bqqvrxndt
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fourmk5grmqone944nbvtj
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twofiveqxfivezpkvfvxt5eightjhnpl
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fpfqp7three7
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scmlf76ninegjzjkj97two
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fivetkhfnnx22
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sevenxvbcbsvxr7eighttwo
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1hvhqqmrs1bgttshthg6
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4bvnccbdh4onefztdrpq62vvbnvpxxvgrngnfjgfk
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653spgrvd
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sixctlhkjmmxh2fourfivenine37
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229mjp3txmqsxxqdbnnnbrtrcctgzseven
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jfourdbpcjc39bhglgnine
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bvnltxdmsp7twoxzpdjdvkxeight4twothree
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jlvcdrkhzh8seven3
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418oneeight
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53flcrlvqdeight84frmdcsixchcbc
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114sixone1eight2
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xrbtzbklqsl11
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bhfhszrhzgrhsfd2threeseventwosevenoneseven
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four9one
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5p
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twovhjpdxmcxshnhv5vs
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qkkqeightcxcltnn7one9pmhlmvsxnine
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4cbptmvp1
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84xgm
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bzsmqhkrdtdmhhjgrjsdfour1ninetwo61
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onetwoeightgflhlgksevennine7two6
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mbjhkhfour6
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8cvqk6eightonethree1
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qhbllbnlkr3rcsmjvztgd
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18eight4
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hhc6onegvkgkqs5mvsone
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66bnfj
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one99xvrhninefive
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eight96nxcjjddmseightxvgsixfiverrzpvmgnl
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rpgpczdsxpjgql39
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855dnthhxld6eight
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four29twosspz1
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sixfiveqvrbcdr9fourlrkpkmxphlsbone
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341
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mhqjjg9six9nine
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7pvjctsgvsix64
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75twotwothreegcvssgbvhpzcnbgteight
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7keight8eight
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52threerhfmklssxcptmnlr4hqc4
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xndfqvgxn3five
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974lknineseven
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rlnsix3
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771m1
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xvtjhq7six64threeeightgspmxgv
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4sbqdxbmmzj6fiveone
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onesvvch4rvhmvncnk
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mkzsftp69six6
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fiveptnn7
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94lsgsjxrrghxxsr4
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1grnvgpeightjthqmrfnszpfhfninefive9mbtf
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qtsdfour2
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5mfhmskpcvqbxjzzxt4lq3sevenkv
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rbhjk1cdzjhtzkcbtvmfm
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nine4eightpmrptkb
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bfiveeight1lxzkzvbtkkgxxs38
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mxcgbjqvhd1sevensevenrgp7two
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fourxrdzzmjfmtr62one
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sevenppqtlhvtwo7phlrbssxb
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dhbnjmxg3bsgbhmlfiveseventwo
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twoonemrbftgtzeightqjmjctmq55
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ggk2lt586dfzqbjsvj1one
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jtgpzjjtwo86seventwo
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37nine4onebqvsnmvg277
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hmpnzmqsfour6
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xzfhgzllmcbc56vpbpbbjffmgr3jrc
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5lclone
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hjbvkdtmrgvpfive9sevenfive1nlzqlkfrg
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htwonetgxvjdkrvjsfjjbfmcthseven29
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six89bdlssd
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3eight6one
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vtbsix2twolzrhfr1
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vhdcvtj5
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167nsnmgxhtvn54fivedcbgrhm
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4three1five82four
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15eightonethreesixthree
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dvhtsccljt51
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pbnfrxblk3sevenxjcmcvhlgrghpbgdnpl8xsr3fiveoneightq
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242three8
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2fivehgqfxgl8kpdknxhmk5bmmsbz
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fivejvjeight6fsqgtpvcb
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1threelgkbhlhhlmrbvxqqgf
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klmqfgfg1gnine253psn8
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47eight
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eight83mvdtsqppjhgjnsvngfive
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7mcmzvsv6seven
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56seven98three4three
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pfnbthreegthreefknjm4five
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2nqgrdcshfpjfpqdrvnq1twoccpmxpxvv
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xtwo7threemxbtpsvjkgrfivethree2
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9pkdfourfour1zjvczkhpbj
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1three2
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pkkbphkgqfivellrnvnkdxpql3
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ppc62
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one73ptfxsbbpqqgctdjhzjsjc91
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nine7threefourvvk
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six59542xcxqcbnrvzfbshcxxddz2
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ftsfj2ninesix1hdjsrpkonelklfpltv
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ninehmxgkqbmhvtlvdmdtvpeighttqfour1three
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frbnineeight4168ksmjstpqvzhnn
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rgnrntwohvqhgxxfkonefour4mfdr5ftgtjjv
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3ninejbszdvdgznfourxpcxspqxnthlngkncvnineccq
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threemjglxtp5cqmtwotwo2seventwonerkl
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eightsevensevenlmbjzprggthree1eight
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57nineninezdcf
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cqoneighteightjnrfkplvninefivemck18mnhszhkv4
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tbvdcsjsvmxtshv3fourseven4kmxvvfour9
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bxcsix19six8dnqsbx
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7five81ncchkdk
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four4ck7rtjmjpccpeightone
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fivetwo6nine1tdczktmfninelrbnnine
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onetwo9twoeight5sevensix
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cvvtbmninebneightsix1dnnfkgmnm
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h7three3
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tpnzsdm9sixtg5sixqvcqsq3
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1sevenzmbcpgtfrjvq
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r8757
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fournineseven6fourfour
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798dpbrkfourtwoxdrgqkrkmfeight7
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threebvqqjcldjx4nine5
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3hbl
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twodndcfddkvfivermvkrfzsnqthree5
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mhdcvsixmnqlvmvxmxfour3ct
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25dpfsrbcllhtwothree2pthreezfhjx
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dcfggnine1onetwoone
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vtbmbpgffive2hdmzjzqqqc4one
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zg11
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txrknhvhbv183
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dlvscqszz82nvtpb7tktvtgjbml
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twofour5sevensmqfjrjcndmvcvqdfsrsix
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446sixeight6rbrltdzf
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132ncq1
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4ninezdfzgvzf4four7qkzstcq
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7rx5xntgxfpmvsevenzmzmbjlc3fivefive
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threeseven7tshthree
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gnbqhninecjnhlpcfivenine18
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gjntwonenllmzgqsvq36lc45fourdrtzlctr
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3tqgbfrk
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zldl3zxpfbpveight
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2ninetgppcvqrq
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7one1sixeighttxcnhltwooneeight
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bsm3hslqcr8xslndqnnvfpzvprlkt
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khvptwo7kkbznndpqsevensevenvlr
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sevenscneight8one4qnkc
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2v
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2threerjnineonev
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68qhknonebtxvmqh
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3btb
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kcxbqzbjqt3twofourfxdlprsxkzlmflbveight
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9bmdcninecjdv7
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ceightwoninelkbbfxgsv9fb5n
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ztwo2
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7four9cpkclqxtrmpdgzxgtwo
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8dghrmgprdjeight8knnb852one
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2three36eightfournone2
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6ztwofkzlhvjdrxtsmlbgczf
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knine6ninebpmzjbkg9tttkhtgcklbfive
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sevenv3
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411one4483
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88jvjggxqfour3zrbvbxjzmthree
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fivelqcnqfvgp18t
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fivejceightqlsdrmrnbzfbjskstzrllxrdlcxpjkvf1
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832
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sixfive77rhkjdhvbpdfjxpkmfdq66qqtfpfs
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fv6svkbnsgtpznblnvkvk5
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sixsevenfoursixeight486
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gsbfrjpngshpmlxf2
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gbmmmvdhffbbcq3
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5fivehxx28
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snjxttwo1zd5sixklfl
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szsvdzsix3nine32nine
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onervkhknmnsix3four363
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1btphrrvxdeightonekdhv8
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gkphmq73lfhflk66xpfive2
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611four3gnjsdkvksjdxfiveeight
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klbvb9zk4eightninetwo
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mreight59sevengqbhnspvhqcj2six
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hnvgkmljlpthsgjrzmsevensix6fcvtxddbnx5
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ckfvkblhvv6gbsnlsevenktblt29three
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eightfoursevendnsghkfsg8fivextnnine
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5hrdqmfjq
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twojcvkkjklzmfive2fourxqgdsdgzrjltwo7
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onetwonvxnxnntxcthree3
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threentwonine6
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sprfmxlqvb9jnbzltskxppqzdscrvhpfvjjcqhxcf
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sixhfour95
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41fourqhpjbztknqnfpxvzc
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two23sevenfgmmnszone113
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one41seven57
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oneninebqqklhk6gmdzddbhgzqcmxxfnmrvr
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4mkpgv87eightckzjjfm
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vhgdmvncxn88ldbt7464
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gcczfprplf7
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6eightninesxthreefive99
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two69fivecjxjhgjmgvttl9
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mztbzjmgxnpkfrqnrbgkgfourjjfjtone8eight
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63mggldkcprlz
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6sevenfourfive
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1zvmrdnpzcsqqmxscn
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five5tkgb8rrztmcfivebknjd
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7pscpfive
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eight9sixgfvhvlcnineeight
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seven99fourtwojvxfrqmrdlthree
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sppcgnjzeight93j
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fivek7seventhree
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twornbhtrlnznpctrxhqtngzdtnvfb2
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sevenfivefour63five38nlrxfcjpm
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qvtdcspc4zxmmhpklhcdlznqfg46lct5one
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1bnndtnsfjdsevenfivetwo3k85
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8five9six
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3ltcc7trmmhbbbpjfive
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cmbchhhczmqlp3
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nctz78twodljcqvplcqg
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nine4sevenpnbbztpvkbgztb
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zseven9eight
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fourktzscmnrvddnnzsqfnfctzpdvtwo9
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nrtbgdjpm2ldcfdm5jjhx9
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jq9two68kjttwo67
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lnneightfourzqz6lgvxnthreeseven7
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fiveglp85
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ninefouronesix7k1three
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3five5sevendhtmjhbh2
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rbjhnmmgsvmtk8four
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vtrvvjsixhnctwocvskgzt3two3
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kxfive5threezgtd2
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2fivemcnngtzxsgbxmvbl
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eightlrlztkvhfivefour5
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2twojcq7qrrbddmpsb
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3twosixthreebqtoneone2
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nine9six3vlmpqbgjjqdftldpq
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tgrglqfxxc2onetwo76oneonex
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one48one
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fivesgsnrzsms6one
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fiveseven1tzhxdknkseven4
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3sprtonefivelxg47
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twotwoseven3ninenqdvxgm
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nskjpvvqeightnine93fivecngkjcd3
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ltfxscllxk9pjznpnmhfmrzmqbq
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4nineeight6four7
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fjtpj763
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four6six73htbstbbpztwofj
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oneonetwo2five43three
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five8bgcjnlzcgqpfkn
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11mcn
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9twovhkltdpkqzc65six
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8fkprfkg9xfjxspqpshlfkqpnrt
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4sblrf7745
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lblxmbzfour6187tggqllj
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|
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|
|
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|
|
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|
|
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|
|
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|
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|
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|
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|
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|
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|
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|
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|
|
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|
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|
|
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|
|
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|
|
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|
|
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|
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|
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|
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|
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|
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seven5zhdthbmrkdpdxfcp8njtqvpnjj14
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8ninetwo
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|
|
fourgffour8
|
|
nine821qbv6five
|
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jbtfg83two
|
|
twozcpjrcnplnz5bdtgpdctb87lzlvqhtrjj
|
|
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|
|
5foureightfourfcs
|
|
1cqjts1jgzkfm
|
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66threetwo
|
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jsdpkfnineeightzpjdmrvxkbhdntj9
|
|
pgcqrsix6mqrr8threeqxgkftbmzninevndn
|
|
kmvqsqhbrcnbqqgninet6
|
|
bxtstqzpqfzqnhjfb8htszvgqhpnggvqt
|
|
ninecpqpffivehg8
|
|
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|
|
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|
|
qr88fivenine1lfvksgrtqseven
|
|
four6foursix
|
|
twoqmnxrjql5fourpdlstnnsfkdjgt9
|
|
4zsvbsjqv97bpxvncr
|
|
xhqlhsbqjhvdqqonesevenfive3qvrtbkhhlfbzsj9
|
|
sixeight4six5szgzcjhpj1
|
|
7vpjq9hjtrjgone
|
|
f92eight
|
|
eighteightnc8134
|
|
22onespjpxlttsqsix8eighthxdfvsdx
|
|
5ninefourgrrmxsxjfxk
|
|
threeninepmvsv763xlxjp
|
|
oneone7lzzhjqqrg
|
|
9fourtqqmhrpmkxhrvlnjvvhsevenseven
|
|
threethreetvjpnoneseven8
|
|
two46onetwoqbvntlxbrftpjf9
|
|
8one5nine1three8
|
|
three69sgdkstpqbqdz
|
|
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|
|
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|
|
61fivegjjsevenqgdkq
|
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49fxhdzfntmk6tb8dpdkknzsb
|
|
bbseven1xvqmlrhx
|
|
2j
|
|
seventwozjqszlhzxlpgphnkz2foursixfour
|
|
1sixhgvhrbonetwom
|
|
fournine8gvmrpgdxvcbdspzdcqt87bdzvxbf5
|
|
3sevennine2fzpt
|
|
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|
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|
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|
8four1cgmm12shfl58
|
|
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|
|
243
|
|
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|
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fivexsczpmltrmcgrvfc58
|
|
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|
|
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|
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|
|
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|
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|
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293rmjjjpmjchjnbdcssfrneightvdzrkbhdln
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eighthcmlrpbhjjmvbjrleightgd94
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57fivefive3cxqj2
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|
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5eightninesixvzvf98two
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8flntwomkktkpvsone78sixone
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sevenzltjhkptjfjbrppm85eight
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|
fivemfrmnqptthreepninepd5
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8fiveeightonetwovgvhzgzfjh16eightwohlk
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|
|
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rbqgdbvrstgninefive4bqq2six
|
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nine3psmkzkgnjbndrcninesevenzvcr6
|
|
eight4jfrqcbqfninedxmdtjgqgtrg6four5
|
|
3mmnineninenjjpmfivetwo
|
|
cv4znxcjthreeqqtdqmzxfknnp
|
|
8pjkm
|
|
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|
|
onethree1bgjsix5sevengpts
|
|
96xlmmthreeeightcbdnrstvpncmr
|
|
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|
|
onespqnnptpdbrgqsqrldstl1
|
|
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|
|
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|
|
3eighttwopninefour
|
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2seven1c
|
|
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|
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|
|
mkbgbkvzdpzxfmrhdcjklxfoureightzzpn3eight
|
|
95ninevhctbgznbzz871sixoneightr
|
|
31onekmseveneight2four
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|
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|
eight221three99two3
|
|
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|
xdglmrpxbz5xpjxzpmvrgsixthreeseven7threebtqfkqp
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|
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|
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seventwoseven7threesixbpld
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1pstwofour8eight3dsdfrseven
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gnvzm19htsbvcsfmlrmbgtstzmm3twoqzffkrrq
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94nvrbbj
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12threehscqzvzcbgfive6three2zhtthr
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three2dpsdhfld95eightwoht
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3zbdlttpbh7fivepgxmrvbzlnfgmbkzknndfqk5
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sevenbcfbpnrvkkscrjtpctdtb69bvvnvlgsmjltlvs
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ftmkmxkd9fvvlg353rp51
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|
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|
58three59nineonesix
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rmjvhrjjmkqsn6gqthreeonefivemxqhrzvffone
|
|
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|
eightseven52five4ninekntfjrdt
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|
4sixldsmv
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|
four3ninerkrcvgcmbb2qm
|
|
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69sixnine
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|
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21ninegnhdkcxhzkcfdksvsmdthree
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|
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|
bzfphcg9fourthreegkchdvrgsx
|
|
2ninebvgdcfxtktqjxjqvxfgjdqfhv5threegqtsfhtfxg
|
|
6rqskvckjzq2qzrnbxjmlthreeeight6hrs
|
|
sixthree6lxcrsevenseven69twonegs
|
|
2dcvcqcbpshsixone3
|
|
drkdbmv4zbjbznsqtj
|
|
eightbqfhnmvqsoneninezbrzcqkz4ftv
|
|
1eightcrcjcbdthreebscfpvznqfrj6
|
|
#+end_example
|
|
|
|
* Day 2: Cube Conundrum
|
|
|
|
** Part One
|
|
*** Quest
|
|
You're launched high into the atmosphere! The apex of your trajectory just barely reaches the
|
|
surface of a large island floating in the sky. You gently land in a fluffy pile of leaves. It's
|
|
quite cold, but you don't see much snow. An Elf runs over to greet you.
|
|
|
|
The Elf explains that you've arrived at *Snow Island* and apologizes for the lack of snow. He'll be
|
|
happy to explain the situation, but it's a bit of a walk, so you have some time. They don't get many
|
|
visitors up here; would you like to play a game in the meantime?
|
|
|
|
As you walk, the Elf shows you a small bag and some cubes which are either red, green, or blue. Each
|
|
time you play this game, he will hide a secret number of cubes of each color in the bag, and your
|
|
goal is to figure out information about the number of cubes.
|
|
|
|
To get information, once a bag has been loaded with cubes, the Elf will reach into the bag, grab a
|
|
handful of random cubes, show them to you, and then put them back in the bag. He'll do this a few
|
|
times per game.
|
|
|
|
You play several games and record the information from each game (your puzzle input). Each game is
|
|
listed with its ID number (like the =11= in =Game 11: ...=) followed by a semicolon-separated list of
|
|
subsets of cubes that were revealed from the bag (like =3 red, 5 green, 4 blue=).
|
|
|
|
For example, the record of a few games might look like this:
|
|
|
|
#+begin_example
|
|
Game 1: 3 blue, 4 red; 1 red, 2 green, 6 blue; 2 green
|
|
Game 2: 1 blue, 2 green; 3 green, 4 blue, 1 red; 1 green, 1 blue
|
|
Game 3: 8 green, 6 blue, 20 red; 5 blue, 4 red, 13 green; 5 green, 1 red
|
|
Game 4: 1 green, 3 red, 6 blue; 3 green, 6 red; 3 green, 15 blue, 14 red
|
|
Game 5: 6 red, 1 blue, 3 green; 2 blue, 1 red, 2 green
|
|
#+end_example
|
|
|
|
In game 1, three sets of cubes are revealed from the bag (and then put back again). The first set is
|
|
3 blue cubes and 4 red cubes; the second set is 1 red cube, 2 green cubes, and 6 blue cubes; the
|
|
third set is only 2 green cubes.
|
|
|
|
The Elf would first like to know which games would have been possible if the bag contained *only 12
|
|
red cubes, 13 green cubes, and 14 blue cubes*?
|
|
|
|
In the example above, games 1, 2, and 5 would have been *possible* if the bag had been loaded with
|
|
that configuration. However, game 3 would have been *impossible* because at one point the Elf showed
|
|
you 20 red cubes at once; similarly, game 4 would also have been *impossible* because the Elf showed
|
|
you 15 blue cubes at once. If you add up the IDs of the games that would have been possible, you
|
|
get =8=.
|
|
|
|
Determine which games would have been possible if the bag had been loaded with only 12 red cubes, 13
|
|
green cubes, and 14 blue cubes. *What is the sum of the IDs of those games?*
|
|
|
|
*** Puzzle Solution
|
|
|
|
I decided to make the code for this as readable as possible.
|
|
I've split the process into multiple parts:
|
|
|
|
**** Record Splitting
|
|
|
|
Here, I am turning the input data into an alist with the game number as key, and the draws as value
|
|
of the entries, by using irregex matches.
|
|
|
|
#+NAME: day2-part1-record-splitting
|
|
#+begin_src scheme
|
|
;; Records
|
|
(define record-pattern
|
|
'(: bol
|
|
"Game "
|
|
(submatch-named game-no (+ (/ #\0 #\9)))
|
|
":"
|
|
(submatch-named draws (*? any))
|
|
eol))
|
|
|
|
(define (record-kons from-index match seed)
|
|
(cons
|
|
(cons (string->number (irregex-match-substring match 'game-no))
|
|
(draws-fold (irregex-match-substring match 'draws)))
|
|
seed))
|
|
|
|
(define (record-fold input)
|
|
(irregex-fold record-pattern record-kons '() input))
|
|
#+end_src
|
|
|
|
**** Draw Splitting
|
|
|
|
Next, as already called inside ~record-kons~, the list of draws has to be split and processed into
|
|
individual draws. Here, I simply split them.
|
|
|
|
#+NAME: day2-part1-draw-splitting
|
|
#+begin_src scheme
|
|
;; Draws
|
|
(define draws-pattern
|
|
'(: " " (* (~ #\;))))
|
|
|
|
(define (draws-kons from-index match seed)
|
|
(cons
|
|
(draw-fold (irregex-match-substring match))
|
|
seed))
|
|
|
|
(define (draws-fold line)
|
|
(irregex-fold draws-pattern draws-kons '() line))
|
|
#+end_src
|
|
|
|
**** Draw Processing
|
|
|
|
And as the last pre-processing step, I take apart the individual draws, and assign each amount to
|
|
its respective colour keyword.
|
|
|
|
#+NAME: day2-part1-draw-processing
|
|
#+begin_src scheme
|
|
;; Draw
|
|
(define draw-pattern
|
|
'(: " "
|
|
(submatch-named amount (+ (/ #\0 #\9)))
|
|
" "
|
|
(submatch-named colour (or "red" "green" "blue"))
|
|
(? ",")))
|
|
|
|
(define (draw-kons from-index match seed)
|
|
(cons
|
|
(cons (string->keyword (irregex-match-substring match 'colour))
|
|
(string->number (irregex-match-substring match 'amount)))
|
|
seed))
|
|
|
|
(define (draw-fold draw)
|
|
(irregex-fold draw-pattern draw-kons '() draw))
|
|
#+end_src
|
|
|
|
**** Main Program
|
|
|
|
I check the possibility of a game by folding over its draws, starting with a ~#t~ (true) value;
|
|
basically, it is nothing more than a recursive ~and~ statement.
|
|
|
|
#+NAME: day2-part1-success-check
|
|
#+begin_src scheme
|
|
;; Game success check
|
|
(define (game-possible? draws)
|
|
(foldl (lambda (seed draw)
|
|
(and seed
|
|
(>= 12 (alist-ref #:red draw eqv? 0))
|
|
(>= 13 (alist-ref #:green draw eqv? 0))
|
|
(>= 14 (alist-ref #:blue draw eqv? 0))))
|
|
#t draws))
|
|
#+end_src
|
|
|
|
Then, I put everything together in a main function, preprocessing the input and summing up all game
|
|
ids for which ~game-possible?~ returns ~#t~.
|
|
|
|
#+NAME: day2-part1-main-function
|
|
#+begin_src scheme
|
|
;; Main function
|
|
(define (sum-of-valid-games input)
|
|
(let ((games (record-fold input)))
|
|
(foldl
|
|
(lambda (seed game)
|
|
(let ((game-id (car game))
|
|
(draws (cdr game)))
|
|
(if (game-possible? draws)
|
|
(+ seed game-id)
|
|
seed)))
|
|
0 games)))
|
|
#+end_src
|
|
|
|
And now, everything can be put together:
|
|
|
|
#+NAME: day2-part1-solution
|
|
#+begin_src scheme :noweb yes :var input=day2-input
|
|
(import (chicken string)
|
|
(chicken keyword)
|
|
(chicken irregex))
|
|
|
|
<<day2-part1-draw-processing>>
|
|
<<day2-part1-draw-splitting>>
|
|
<<day2-part1-record-splitting>>
|
|
<<day2-part1-success-check>>
|
|
<<day2-part1-main-function>>
|
|
#+end_src
|
|
|
|
#+RESULTS: day2-part1-solution
|
|
: 2406
|
|
|
|
** Part Two
|
|
|
|
*** Quest
|
|
|
|
The Elf says they've stopped producing snow because they aren't getting any *water*! He isn't sure
|
|
why the water stopped; however, he can show you how to get to the water source to check it out for
|
|
yourself. It's just up ahead!
|
|
|
|
As you continue your walk, the Elf poses a second question: in each game you played, what is the
|
|
*fewest number of cubes of each color* that could have been in the bag to make the game possible?
|
|
|
|
Again consider the example games from earlier:
|
|
|
|
#+begin_example
|
|
Game 1: 3 blue, 4 red; 1 red, 2 green, 6 blue; 2 green
|
|
Game 2: 1 blue, 2 green; 3 green, 4 blue, 1 red; 1 green, 1 blue
|
|
Game 3: 8 green, 6 blue, 20 red; 5 blue, 4 red, 13 green; 5 green, 1 red
|
|
Game 4: 1 green, 3 red, 6 blue; 3 green, 6 red; 3 green, 15 blue, 14 red
|
|
Game 5: 6 red, 1 blue, 3 green; 2 blue, 1 red, 2 green
|
|
#+end_example
|
|
|
|
- In game 1, the game could have been played with as few as 4 red, 2 green, and 6 blue cubes. If any
|
|
color had even one fewer cube, the game would have been impossible.
|
|
- Game 2 could have been played with a minimum of 1 red, 3 green, and 4 blue cubes.
|
|
- Game 3 must have been played with at least 20 red, 13 green, and 6 blue cubes.
|
|
- Game 4 required at least 14 red, 3 green, and 15 blue cubes.
|
|
- Game 5 needed no fewer than 6 red, 3 green, and 2 blue cubes in the bag.
|
|
|
|
The *power* of a set of cubes is equal to the numbers of red, green, and blue cubes multiplied
|
|
together. The power of the minimum set of cubes in game 1 is =48=. In games 2-5 it was =12=, =1560=,
|
|
=630=, and =36=, respectively. Adding up these five powers produces the sum *=2286=*.
|
|
|
|
For each game, find the minimum set of cubes that must have been present. *What is the sum of the
|
|
power of these sets?*
|
|
|
|
*** Puzzle Solution
|
|
|
|
Most code can be reused from the first part; only the success check and the main function have to be
|
|
rewritten to accommodate the new requirements.
|
|
|
|
The success check gets replaced by a function that multiplies the maxima together.
|
|
|
|
#+NAME: day2-part2-powercalc
|
|
#+begin_src scheme
|
|
(define (powercalc draws)
|
|
(* (apply max (map (lambda (draw)
|
|
(alist-ref #:red draw eqv? 1))
|
|
draws))
|
|
(apply max (map (lambda (draw)
|
|
(alist-ref #:green draw eqv? 1))
|
|
draws))
|
|
(apply max (map (lambda (draw)
|
|
(alist-ref #:blue draw eqv? 1))
|
|
draws))))
|
|
#+end_src
|
|
|
|
And the main function gets modified to sum everything up.
|
|
|
|
#+NAME: day2-part2-main-function
|
|
#+begin_src scheme
|
|
(define (game-set-power input)
|
|
(let ((games (record-fold input)))
|
|
(foldl + 0
|
|
(map (lambda (game)
|
|
(powercalc (cdr game)))
|
|
games))))
|
|
#+end_src
|
|
|
|
The full thing put together:
|
|
|
|
#+NAME: day2-part2-solution
|
|
#+begin_src scheme :noweb yes :var input=day2-input
|
|
(import (chicken string)
|
|
(chicken keyword)
|
|
(chicken irregex))
|
|
|
|
<<day2-part1-draw-processing>>
|
|
<<day2-part1-draw-splitting>>
|
|
<<day2-part1-record-splitting>>
|
|
<<day2-part2-powercalc>>
|
|
<<day2-part2-main-function>>
|
|
#+end_src
|
|
|
|
#+RESULTS: day2-part1-solution
|
|
: 78375
|
|
|
|
** Puzzle Input
|
|
|
|
Jump to [[#headline-22][day 3]].
|
|
|
|
#+NAME: day2-input
|
|
#+begin_example
|
|
Game 1: 2 blue, 4 green; 7 blue, 1 red, 14 green; 5 blue, 13 green, 1 red; 1 red, 7 blue, 11 green
|
|
Game 2: 6 blue, 3 green; 4 red, 1 green, 7 blue; 2 green
|
|
Game 3: 4 blue, 3 red; 2 blue, 4 red, 7 green; 1 blue, 6 red, 7 green; 5 green, 10 blue; 9 green, 1 blue, 6 red; 8 blue, 1 red, 12 green
|
|
Game 4: 15 blue, 4 green, 5 red; 2 red, 2 green, 5 blue; 3 green, 13 blue; 17 blue, 1 green, 5 red
|
|
Game 5: 11 green, 4 red, 3 blue; 8 blue, 6 green; 8 green, 2 red, 9 blue; 4 red, 16 blue; 8 blue, 10 red, 6 green; 9 blue, 3 red, 10 green
|
|
Game 6: 4 green, 9 red, 2 blue; 7 red, 2 green, 15 blue; 13 red, 2 green, 6 blue; 5 green, 7 blue, 6 red; 19 red, 15 blue, 4 green
|
|
Game 7: 12 blue, 5 red; 5 green, 6 blue; 5 red, 15 blue; 5 blue, 5 red, 5 green; 1 green, 11 blue, 2 red
|
|
Game 8: 6 red, 11 green; 5 red, 2 blue, 7 green; 7 red, 6 green
|
|
Game 9: 5 red, 1 blue, 11 green; 4 green, 1 blue; 8 green, 2 red; 1 green, 2 red, 2 blue; 3 green, 2 red
|
|
Game 10: 7 blue, 4 red, 11 green; 13 green, 1 red, 1 blue; 7 blue, 6 green
|
|
Game 11: 4 blue, 7 red, 2 green; 1 green, 14 red, 3 blue; 2 green, 5 red, 3 blue
|
|
Game 12: 6 green, 6 blue, 1 red; 1 green, 3 red, 2 blue; 2 blue, 6 red, 7 green
|
|
Game 13: 6 red, 10 green, 13 blue; 3 red, 12 green, 9 blue; 11 blue, 1 green; 4 red, 3 blue, 13 green; 12 green, 10 blue, 6 red; 13 blue, 3 green, 3 red
|
|
Game 14: 8 green, 1 blue, 17 red; 7 green, 11 blue, 19 red; 19 red, 9 blue, 2 green; 8 green, 20 red, 12 blue; 16 red, 3 green, 11 blue
|
|
Game 15: 3 red, 1 green, 5 blue; 9 blue, 4 green; 6 blue, 5 green, 9 red
|
|
Game 16: 13 blue, 1 red; 2 blue, 2 green; 1 green; 10 blue, 8 red; 4 red, 3 green, 9 blue
|
|
Game 17: 10 blue, 2 red; 3 green, 4 red; 6 blue, 1 red, 6 green; 5 green, 7 blue, 5 red
|
|
Game 18: 3 red, 1 green; 2 red, 5 blue; 5 blue, 2 red
|
|
Game 19: 7 green, 4 blue, 1 red; 1 green, 4 blue, 4 red; 6 blue, 8 green; 4 green, 2 blue, 1 red; 1 red, 1 blue, 2 green
|
|
Game 20: 13 green, 1 red, 1 blue; 12 green, 1 blue; 5 green, 1 blue, 2 red; 16 green, 3 red; 2 red, 9 green
|
|
Game 21: 8 red, 2 green, 2 blue; 5 red, 3 blue; 2 blue, 5 red, 2 green; 7 blue
|
|
Game 22: 9 red, 12 blue, 7 green; 7 red, 13 blue, 4 green; 9 blue, 13 red, 1 green; 3 blue, 4 red, 5 green
|
|
Game 23: 7 green, 12 red; 6 red, 7 green, 4 blue; 1 blue, 11 red, 5 green; 4 green, 2 blue, 6 red; 12 green, 6 red, 3 blue
|
|
Game 24: 11 red, 4 blue; 9 blue, 6 green, 17 red; 8 green, 2 red; 16 blue, 6 red, 2 green
|
|
Game 25: 7 red, 4 blue; 7 blue, 4 green; 10 blue, 4 red, 2 green; 6 green, 4 blue, 1 red; 10 blue, 2 red, 4 green
|
|
Game 26: 7 green, 8 red, 6 blue; 5 red, 3 green, 2 blue; 13 blue, 6 green, 5 red; 10 blue, 4 red, 8 green; 2 red, 2 blue, 1 green; 8 blue, 1 green, 4 red
|
|
Game 27: 7 green, 3 blue, 13 red; 1 green, 17 red, 1 blue; 16 red, 3 blue, 3 green; 5 green, 3 red, 5 blue; 13 red, 4 green, 8 blue; 6 blue, 2 green, 15 red
|
|
Game 28: 8 blue, 5 red, 18 green; 1 green, 6 red; 7 blue, 18 green, 5 red; 16 green, 3 red, 7 blue; 6 blue, 18 green; 8 blue, 8 green, 7 red
|
|
Game 29: 4 blue, 1 red; 6 blue, 1 red; 17 blue, 1 green
|
|
Game 30: 1 red, 2 green, 5 blue; 2 blue, 7 green, 6 red; 11 blue, 4 red, 2 green; 5 green, 6 blue, 4 red; 5 red, 8 blue, 7 green
|
|
Game 31: 10 green, 9 blue; 5 green, 9 blue, 1 red; 1 red, 8 blue
|
|
Game 32: 3 red, 5 green; 5 red, 5 blue, 14 green; 2 red, 2 green; 11 green, 3 red, 5 blue
|
|
Game 33: 7 blue, 10 green, 8 red; 18 blue, 15 green, 4 red; 6 red, 1 green; 18 blue, 8 red, 11 green
|
|
Game 34: 3 green; 2 red, 5 green; 5 blue, 3 green; 3 blue, 5 green, 1 red
|
|
Game 35: 1 blue, 5 green, 6 red; 3 green, 2 red, 3 blue; 4 red, 9 blue, 3 green; 1 green, 12 blue, 1 red
|
|
Game 36: 14 green, 3 blue, 16 red; 1 green, 2 red, 4 blue; 4 blue, 9 green, 18 red; 4 blue, 4 green, 14 red; 4 blue, 11 green
|
|
Game 37: 7 green, 2 blue, 3 red; 8 green, 9 red, 2 blue; 4 blue, 15 green, 18 red
|
|
Game 38: 11 red, 1 blue, 6 green; 6 green, 2 blue, 1 red; 6 blue, 17 red, 2 green; 17 red, 9 blue, 3 green; 7 red, 7 blue, 3 green; 3 green, 7 red, 7 blue
|
|
Game 39: 1 blue, 2 green; 1 blue, 2 green, 7 red; 1 blue, 4 red, 2 green; 1 blue, 12 red
|
|
Game 40: 1 blue, 4 red, 15 green; 12 green, 1 blue, 15 red; 15 red, 8 green
|
|
Game 41: 5 blue, 5 green, 1 red; 9 red, 8 green, 9 blue; 10 red, 10 blue, 4 green; 3 blue, 17 red, 3 green; 3 blue, 4 red, 2 green
|
|
Game 42: 2 blue, 10 red, 17 green; 6 red, 10 green, 10 blue; 3 blue, 6 green, 8 red; 9 green, 2 blue, 8 red; 13 green, 5 blue; 4 red, 18 green, 11 blue
|
|
Game 43: 8 red, 3 blue, 6 green; 2 red, 8 green, 10 blue; 5 blue, 9 red, 9 green; 1 green, 15 red, 8 blue
|
|
Game 44: 11 green, 19 red, 14 blue; 1 red, 19 green, 9 blue; 7 green, 8 red, 10 blue; 14 green, 8 blue, 15 red; 7 green, 3 red, 2 blue
|
|
Game 45: 4 green, 9 blue, 4 red; 7 blue, 13 green, 2 red; 12 green, 10 blue, 10 red
|
|
Game 46: 10 red, 2 green, 1 blue; 10 red, 10 green, 1 blue; 1 blue, 13 green; 1 blue, 2 green, 10 red; 1 blue, 7 red, 11 green; 10 red, 5 green
|
|
Game 47: 3 blue, 2 green, 12 red; 5 blue, 7 red; 5 green, 14 red; 12 red, 7 green, 5 blue
|
|
Game 48: 5 red, 1 blue, 3 green; 7 red, 8 green, 4 blue; 4 blue, 5 green, 17 red; 1 blue, 12 red
|
|
Game 49: 2 green, 7 red, 1 blue; 11 green, 5 red; 4 red, 1 blue, 1 green; 11 green, 1 blue, 7 red
|
|
Game 50: 10 red, 3 blue, 6 green; 1 blue, 5 red, 3 green; 6 blue, 11 red, 12 green; 10 green
|
|
Game 51: 18 blue, 1 green, 1 red; 15 blue; 13 blue, 11 green, 4 red; 8 red, 1 green, 18 blue; 10 green, 7 blue, 8 red
|
|
Game 52: 13 green, 15 blue; 6 blue, 4 red, 8 green; 6 red, 13 green, 11 blue; 2 red, 7 green, 13 blue; 12 green, 2 blue, 3 red; 6 red, 11 green, 1 blue
|
|
Game 53: 2 red, 2 green; 3 green, 1 blue, 1 red; 1 blue, 4 green, 7 red; 4 red, 1 blue; 4 red, 5 green, 2 blue
|
|
Game 54: 8 blue, 2 red, 5 green; 6 green, 2 blue, 3 red; 1 blue, 8 green, 4 red
|
|
Game 55: 6 green, 6 blue, 3 red; 13 green, 1 red; 2 blue, 1 red, 1 green; 14 green, 1 blue, 1 red; 1 blue, 2 red, 9 green; 9 green, 2 blue, 4 red
|
|
Game 56: 4 green, 6 blue, 1 red; 5 red, 3 blue; 6 red, 1 blue; 9 green, 5 blue, 7 red
|
|
Game 57: 5 red, 5 green, 8 blue; 11 red, 3 blue, 8 green; 7 green, 9 blue, 11 red; 3 green, 2 blue, 12 red
|
|
Game 58: 3 green, 3 red; 4 red, 1 green; 1 red, 6 green; 5 green; 5 red, 1 blue, 3 green; 3 red, 1 blue
|
|
Game 59: 2 green, 2 blue; 7 red, 18 green; 2 blue, 7 red, 16 green; 7 red, 10 green
|
|
Game 60: 3 blue, 4 red; 4 blue, 3 red, 3 green; 16 green
|
|
Game 61: 1 blue, 2 red, 8 green; 9 blue, 4 green, 12 red; 10 green, 2 red; 5 blue, 11 red, 1 green; 10 green, 3 blue, 8 red; 5 red, 2 green
|
|
Game 62: 15 red, 10 blue, 7 green; 4 blue, 9 red, 4 green; 4 red, 2 blue, 2 green; 11 green, 2 red; 8 blue, 2 green; 2 green, 8 red, 8 blue
|
|
Game 63: 2 green, 3 blue, 1 red; 7 blue, 5 red; 7 blue
|
|
Game 64: 3 green, 5 blue, 6 red; 9 green, 4 red; 13 red, 1 blue, 5 green; 4 blue, 13 red, 8 green
|
|
Game 65: 7 green, 1 blue; 1 red, 14 blue, 4 green; 8 blue, 6 red; 14 green, 4 red
|
|
Game 66: 6 red, 11 green, 7 blue; 1 blue, 6 red; 13 red, 7 blue, 3 green; 8 red, 6 blue, 15 green; 7 green, 6 blue, 4 red; 4 red, 1 blue, 20 green
|
|
Game 67: 4 blue, 9 green; 15 red, 16 green, 3 blue; 1 green, 14 red, 3 blue; 3 red, 2 blue, 3 green; 4 green, 3 blue, 12 red
|
|
Game 68: 5 green, 3 blue, 2 red; 4 green, 8 blue, 11 red; 6 red, 6 blue, 4 green; 8 red, 5 blue, 7 green; 6 blue, 6 green, 11 red; 2 blue, 3 green, 3 red
|
|
Game 69: 15 blue, 16 green, 5 red; 10 blue, 3 red, 13 green; 4 red, 5 blue, 2 green; 1 red; 11 green, 5 red, 15 blue
|
|
Game 70: 8 red, 9 blue, 12 green; 3 red, 2 blue, 14 green; 10 blue, 1 red, 18 green; 1 blue, 7 red, 16 green; 3 green, 4 red, 16 blue; 10 green, 6 red
|
|
Game 71: 12 blue, 7 red, 16 green; 2 red, 9 blue, 15 green; 1 red, 11 blue, 11 green; 15 red, 16 blue, 2 green
|
|
Game 72: 1 blue, 11 red, 6 green; 1 red, 2 blue, 5 green; 4 green, 2 red; 2 green, 12 red
|
|
Game 73: 1 blue, 1 red; 2 red, 4 blue, 2 green; 1 blue, 2 green, 10 red; 8 red
|
|
Game 74: 12 red, 1 green, 4 blue; 1 red, 5 blue, 1 green; 11 green, 16 red, 7 blue; 7 red, 1 blue, 1 green; 12 red, 11 green, 12 blue; 11 green, 6 red
|
|
Game 75: 12 green, 8 red, 3 blue; 7 red, 10 green; 1 green, 7 blue, 1 red
|
|
Game 76: 4 green, 1 red, 3 blue; 7 blue, 3 green, 3 red; 4 blue, 2 red, 3 green; 4 blue, 1 green
|
|
Game 77: 2 green, 12 blue, 10 red; 5 blue, 7 red; 2 red, 6 green; 1 blue, 2 red, 6 green
|
|
Game 78: 2 green, 4 blue, 4 red; 8 green, 10 red, 10 blue; 5 green, 8 blue, 10 red; 6 green, 2 red
|
|
Game 79: 3 green, 2 blue, 11 red; 8 red, 11 green, 1 blue; 1 blue, 16 red; 5 red, 7 green, 16 blue; 12 red, 7 green, 9 blue; 4 red, 20 blue, 12 green
|
|
Game 80: 3 red, 5 green; 2 blue, 4 green; 2 red, 12 green, 4 blue; 10 green, 1 blue, 1 red; 4 blue, 3 red
|
|
Game 81: 1 blue, 1 green, 1 red; 5 green, 3 red, 1 blue; 1 blue, 6 green; 1 green; 1 red, 5 green, 2 blue; 1 blue, 1 red, 3 green
|
|
Game 82: 7 green, 10 blue, 3 red; 10 green, 12 red, 12 blue; 18 red, 8 green, 14 blue; 3 red, 3 green, 10 blue; 3 red, 1 blue, 5 green; 1 green, 8 blue
|
|
Game 83: 9 red, 3 blue; 14 blue, 8 red, 3 green; 14 blue, 5 green, 4 red
|
|
Game 84: 2 blue, 3 red, 6 green; 11 green, 2 red, 1 blue; 17 green, 3 blue, 3 red; 1 red, 1 blue; 1 red, 2 blue, 19 green
|
|
Game 85: 3 green, 2 blue, 3 red; 4 red, 5 blue, 8 green; 15 green, 1 red, 9 blue; 12 green, 3 blue, 2 red
|
|
Game 86: 15 green, 7 red, 10 blue; 2 blue, 2 red, 1 green; 4 red, 1 green, 9 blue; 7 red, 14 blue, 5 green
|
|
Game 87: 1 green, 3 blue, 1 red; 2 blue, 1 green; 1 blue, 2 green, 1 red
|
|
Game 88: 2 green, 6 blue, 5 red; 5 blue, 2 red; 3 red, 13 blue; 9 blue, 10 red, 1 green
|
|
Game 89: 6 green, 10 red, 2 blue; 7 red, 1 blue, 8 green; 4 blue, 3 red, 5 green; 4 green, 4 blue, 10 red
|
|
Game 90: 8 red, 7 blue; 4 green, 3 red, 1 blue; 5 blue, 2 green
|
|
Game 91: 15 green, 14 red; 12 red, 16 green, 2 blue; 8 red, 10 green; 1 green, 6 red; 8 green, 12 red
|
|
Game 92: 4 blue, 4 green, 9 red; 1 blue, 17 green; 1 green; 15 green, 3 blue, 12 red; 11 red, 1 blue, 7 green; 7 blue, 13 red, 8 green
|
|
Game 93: 10 blue, 12 red; 10 blue, 11 green, 8 red; 1 blue, 11 green, 7 red; 10 blue, 15 red, 5 green; 11 red, 8 green, 9 blue; 10 green, 3 blue
|
|
Game 94: 1 blue, 2 red; 4 red, 1 green, 5 blue; 3 red, 2 green; 2 green, 2 blue; 1 red, 5 blue, 1 green; 4 blue, 1 red, 2 green
|
|
Game 95: 1 red, 1 blue, 3 green; 2 green, 6 blue; 1 green, 13 blue, 1 red; 3 green, 15 blue
|
|
Game 96: 16 blue, 7 green, 5 red; 5 green, 5 blue, 6 red; 3 green, 17 blue, 10 red; 13 blue, 2 red, 1 green
|
|
Game 97: 12 red; 1 blue, 6 red, 1 green; 9 red, 2 blue, 1 green; 1 green, 2 blue, 1 red; 15 red, 1 blue; 1 blue
|
|
Game 98: 11 red, 6 blue, 13 green; 4 blue, 2 red, 12 green; 2 blue, 8 green, 10 red
|
|
Game 99: 2 red, 1 blue; 4 green; 7 green, 1 blue, 1 red; 5 green, 2 red; 1 blue, 2 red, 9 green; 2 green, 3 red
|
|
Game 100: 7 red, 11 blue; 10 red, 5 blue, 1 green; 7 red, 1 green, 13 blue; 9 red; 9 red, 19 blue; 9 red, 9 blue
|
|
#+end_example
|
|
|
|
* Day 3: Gear Ratios
|
|
|
|
** Part One
|
|
|
|
*** Quest
|
|
|
|
You and the Elf eventually reach a [[https://en.wikipedia.org/wiki/Gondola_lift][gondola lift]] station; he says the gondola lift will take you up
|
|
to the *water source*, but this is as far as he can bring you. You go inside.
|
|
|
|
It doesn't take long to find the gondolas, but there seems to be a problem: they're not moving.
|
|
|
|
"Aaah!"
|
|
|
|
You turn around to see a slightly-greasy Elf with a wrench and a look of surprise. "Sorry, I wasn't
|
|
expecting anyone! The gondola lift isn't working right now; it'll still be a while before I can fix
|
|
it." You offer to help.
|
|
|
|
The engineer explains that an engine part seems to be missing from the engine, but nobody can figure
|
|
out which one. If you can *add up all the part numbers* in the engine schematic, it should be easy
|
|
to work out which part is missing.
|
|
|
|
The engine schematic (your puzzle input) consists of a visual representation of the engine. There
|
|
are lots of numbers and symbols you don't really understand, but apparently *any number adjacent to
|
|
a symbol*, even diagonally, is a "part number" and should be included in your sum. (Periods (=.=) do
|
|
not count as a symbol.)
|
|
|
|
Here is an example engine schematic:
|
|
|
|
#+begin_example
|
|
467..114..
|
|
...*......
|
|
..35..633.
|
|
......#...
|
|
617*......
|
|
.....+.58.
|
|
..592.....
|
|
......755.
|
|
...$.*....
|
|
.664.598..
|
|
#+end_example
|
|
|
|
In this schematic, two numbers are *not* part numbers because they are not adjacent to a symbol:
|
|
=114= (top right) and =58= (middle right). Every other number is adjacent to a symbol and so *is* a
|
|
part number; their sum is *=4361=*.
|
|
|
|
Of course, the actual engine schematic is much larger. *What is the sum of all of the part numbers
|
|
in the engine schematic?*
|
|
|
|
*** Puzzle Solution
|
|
|
|
#+begin_src scheme :exports none :noweb yes :tangle day3.scm
|
|
(import (chicken string)
|
|
(chicken format))
|
|
(define input "
|
|
<<day3-input>>
|
|
")
|
|
#+end_src
|
|
|
|
**** Records
|
|
|
|
#+NAME: day3-part1-records
|
|
#+begin_src scheme :tangle day3.scm
|
|
(define-record part-number number line start-col end-col)
|
|
(define-record part-symbol sym line start-col end-col)
|
|
(define-record buffer-char char line col)
|
|
#+end_src
|
|
|
|
**** Indexing the Input
|
|
|
|
#+NAME: day3-part1-indexing
|
|
#+begin_src scheme :tangle day3.scm
|
|
(define (index-input input #!optional (indexed-input '()) (line-index 0) (col-index 0))
|
|
(if (= 0 (length input))
|
|
(reverse indexed-input)
|
|
(let ((next-char (car input))
|
|
(new-rest-input (cdr input)))
|
|
(if (eqv? #\newline next-char)
|
|
(index-input new-rest-input
|
|
indexed-input
|
|
(+ line-index 1)
|
|
0)
|
|
(index-input new-rest-input
|
|
(cons (make-buffer-char next-char line-index col-index)
|
|
indexed-input)
|
|
line-index
|
|
(+ col-index 1))))))
|
|
#+end_src
|
|
|
|
**** Tokenizing the Indexed Input
|
|
|
|
#+NAME: day3-part1-number-char-p
|
|
#+begin_src scheme :tangle day3.scm
|
|
(define (number-char? c)
|
|
(case (buffer-char-char c)
|
|
((#\0 #\1 #\2 #\3 #\4 #\5 #\6 #\7 #\8 #\9) #t)
|
|
(else #f)))
|
|
#+end_src
|
|
|
|
#+NAME: day3-part1-finalize-token
|
|
#+begin_src scheme :tangle day3.scm
|
|
(define (finalize-token buffer)
|
|
(let* ((rev-buffer (reverse buffer))
|
|
(line (buffer-char-line (car buffer)))
|
|
(start-col (buffer-char-col (car buffer)))
|
|
(end-col (buffer-char-col (car rev-buffer))))
|
|
(if (number-char? (car buffer))
|
|
(make-part-number (string->number
|
|
(apply string (map buffer-char-char buffer)))
|
|
line start-col end-col)
|
|
(make-part-symbol (string->symbol
|
|
(apply string (map buffer-char-char buffer)))
|
|
line start-col end-col))))
|
|
#+end_src
|
|
|
|
#+NAME: day3-part1-compatible-with-buffer-p
|
|
#+begin_src scheme :tangle day3.scm
|
|
(define (compatible-with-buffer? buffer char)
|
|
(and
|
|
(not (eqv? #\. (buffer-char-char char)))
|
|
(or (= 0 (length buffer))
|
|
(and (number-char? (car buffer))
|
|
(number-char? char))
|
|
(and (not (number-char? (car buffer)))
|
|
(not (number-char? char))))))
|
|
#+end_src
|
|
|
|
#+NAME: day3-part1-tokenize-indexed-input
|
|
#+begin_src scheme :tangle day3.scm
|
|
(define (tokenize-indexed-input indexed-input #!optional (token-buffer '()) (part-nums '()) (part-syms '()))
|
|
(if (= 0 (length indexed-input))
|
|
(values (reverse part-nums)
|
|
(reverse part-syms))
|
|
(let ((next-char (car indexed-input)))
|
|
(cond
|
|
((compatible-with-buffer? token-buffer (car indexed-input))
|
|
(tokenize-indexed-input (cdr indexed-input)
|
|
(cons (car indexed-input) token-buffer)
|
|
part-nums part-syms))
|
|
((= 0 (length token-buffer))
|
|
(tokenize-indexed-input
|
|
(cdr indexed-input)
|
|
(if (eqv? #\. (buffer-char-char (car indexed-input)))
|
|
token-buffer (list (car indexed-input)))
|
|
part-nums part-syms))
|
|
(else
|
|
(let ((token (finalize-token (reverse token-buffer))))
|
|
(tokenize-indexed-input
|
|
(cdr indexed-input)
|
|
(if (eqv? #\. (buffer-char-char next-char)) '() (list (car indexed-input)))
|
|
(if (part-number? token) (cons token part-nums) part-nums)
|
|
(if (part-symbol? token) (cons token part-syms) part-syms))))))))
|
|
#+end_src
|
|
|
|
**** Checking for Part Neighbours
|
|
|
|
#+NAME: day3-part1-neighbours-p
|
|
#+begin_src scheme :tangle day3.scm
|
|
(define (neighbours? part-num part-sym)
|
|
(let ((part-num-line (part-number-line part-num))
|
|
(col-min (- (part-number-start-col part-num) 1))
|
|
(col-max (+ (part-number-end-col part-num) 1)))
|
|
(and (>= (part-symbol-line part-sym) (- part-num-line 1))
|
|
(<= (part-symbol-line part-sym) (+ part-num-line 1))
|
|
(>= (part-symbol-start-col part-sym) col-min)
|
|
(<= (part-symbol-start-col part-sym) col-max)
|
|
(>= (part-symbol-end-col part-sym) col-min)
|
|
(<= (part-symbol-end-col part-sym) col-max))))
|
|
#+end_src
|
|
|
|
**** Folding Everything Together
|
|
|
|
#+NAME: day3-part1-real-part-number-p
|
|
#+begin_src scheme :tangle day3.scm
|
|
(define (is-real-part-number? part-num part-syms)
|
|
(and (< 0 (length part-syms))
|
|
(or (neighbours? part-num (car part-syms))
|
|
(is-real-part-number? part-num (cdr part-syms)))))
|
|
#+end_src
|
|
|
|
#+NAME: day3-part1-fold
|
|
#+begin_src scheme :tangle day3.scm
|
|
(define (fold-part-numbers part-nums part-syms)
|
|
(foldl (lambda (output input)
|
|
(if (is-real-part-number? input part-syms)
|
|
(+ output (part-number-number input))
|
|
output))
|
|
0 part-nums))
|
|
#+end_src
|
|
|
|
#+NAME: day3-part1-calc
|
|
#+begin_src scheme
|
|
(let-values (((part-nums part-syms) (tokenize-indexed-input (index-input (string->list input)))))
|
|
(fold-part-numbers part-nums part-syms))
|
|
#+end_src
|
|
|
|
#+NAME: day3-part1-calc-full
|
|
#+begin_src scheme :var input=day3-input :noweb yes :exports results
|
|
(import (chicken string))
|
|
<<day3-part1-records>>
|
|
<<day3-part1-indexing>>
|
|
<<day3-part1-number-char-p>>
|
|
<<day3-part1-finalize-token>>
|
|
<<day3-part1-compatible-with-buffer-p>>
|
|
<<day3-part1-tokenize-indexed-input>>
|
|
<<day3-part1-neighbours-p>>
|
|
<<day3-part1-real-part-number-p>>
|
|
<<day3-part1-fold>>
|
|
<<day3-part1-calc>>
|
|
#+end_src
|
|
|
|
#+RESULTS: day3-part1-calc-full
|
|
: 509115
|
|
|
|
#+begin_src scheme :noweb yes :exports none :tangle day3.scm
|
|
(define (calc-part-1)
|
|
<<day3-part1-calc>>)
|
|
#+end_src
|
|
|
|
** Part Two
|
|
|
|
*** Quest
|
|
|
|
The engineer finds the missing part and installs it in the engine! As the engine springs to life,
|
|
you jump in the closest gondola, finally ready to ascend to the water source.
|
|
|
|
You don't seem to be going very fast, though. Maybe something is still wrong? Fortunately, the
|
|
gondola has a phone labeled "help", so you pick it up and the engineer answers.
|
|
|
|
Before you can explain the situation, she suggests that you look out the window. There stands the
|
|
engineer, holding a phone in one hand and waving with the other. You're going so slowly that you
|
|
haven't even left the station. You exit the gondola.
|
|
|
|
The missing part wasn't the only issue - one of the gears in the engine is wrong. A *gear* is any
|
|
=*= symbol that is adjacent to *exactly two part numbers*. Its *gear ratio* is the result of
|
|
multiplying those two numbers together.
|
|
|
|
This time, you need to find the gear ratio of every gear and add them all up so that the engineer
|
|
can figure out which gear needs to be replaced.
|
|
|
|
Consider the same engine schematic again:
|
|
|
|
#+begin_example
|
|
467..114..
|
|
...*......
|
|
..35..633.
|
|
......#...
|
|
617*......
|
|
.....+.58.
|
|
..592.....
|
|
......755.
|
|
...$.*....
|
|
.664.598..
|
|
#+end_example
|
|
|
|
In this schematic, there are *two* gears. The first is in the top left; it has part numbers =467=
|
|
and =35=, so its gear ratio is =16345=. The second gear is in the lower right; its gear ratio is
|
|
=451490=. (The =*= adjacent to =617= is *not* a gear because it is only adjacent to one part
|
|
number.) Adding up all of the gear ratios produces *=467835=*.
|
|
*What is the sum of all of the gear ratios in your engine schematic?*
|
|
|
|
*** Puzzle Solution
|
|
|
|
**** Gather Symbol Neighbours
|
|
|
|
#+NAME: day3-part2-sym-neighbour-count
|
|
#+begin_src scheme :tangle day3.scm
|
|
(define (gather-neighbours part-sym part-nums)
|
|
(foldl (lambda (output input)
|
|
(if (neighbours? input part-sym)
|
|
(cons input output)
|
|
output))
|
|
(list) part-nums))
|
|
#+end_src
|
|
|
|
**** Put Everything Together
|
|
|
|
#+NAME: day3-part2-filter
|
|
#+begin_src scheme :tangle day3.scm
|
|
(define (filter-gear-candidates part-syms)
|
|
(foldl (lambda (output input)
|
|
(if (eqv? '* (part-symbol-sym input))
|
|
(cons input output) output))
|
|
(list) part-syms))
|
|
#+end_src
|
|
|
|
#+NAME: day3-part2-fold
|
|
#+begin_src scheme :tangle day3.scm
|
|
(define (calc-gear-ratio gears)
|
|
(foldl (lambda (output input)
|
|
(if (= 2 (length input))
|
|
(+ output (apply * (map part-number-number input)))
|
|
output))
|
|
0 gears))
|
|
#+end_src
|
|
|
|
#+NAME: day3-part2-calc
|
|
#+begin_src scheme
|
|
(let-values (((part-nums part-syms) (tokenize-indexed-input (index-input (string->list input)))))
|
|
(let ((gear-candidates (map (lambda (x) (gather-neighbours x part-nums)) (filter-gear-candidates part-syms))))
|
|
(calc-gear-ratio gears)))
|
|
#+end_src
|
|
|
|
#+NAME: day3-part2-calc-full
|
|
#+begin_src scheme :var input=day3-input :noweb yes :exports results
|
|
(import (chicken string))
|
|
<<day3-part1-records>>
|
|
<<day3-part1-indexing>>
|
|
<<day3-part1-number-char-p>>
|
|
<<day3-part1-finalize-token>>
|
|
<<day3-part1-compatible-with-buffer-p>>
|
|
<<day3-part1-tokenize-indexed-input>>
|
|
<<day3-part1-neighbours-p>>
|
|
<<day3-part2-sym-neighbour-count>>
|
|
<<day3-part2-filter>>
|
|
<<day3-part2-fold>>
|
|
<<day3-part2-calc>>
|
|
#+end_src
|
|
|
|
#+RESULTS: day3-part2-calc-full
|
|
: 75220503
|
|
|
|
#+begin_src scheme :noweb yes :exports none :tangle day3.scm
|
|
(define (calc-part-2)
|
|
<<day3-part2-calc>>)
|
|
#+end_src
|
|
|
|
** Puzzle Input
|
|
|
|
#+NAME: day3-input
|
|
#+begin_src fundamental
|
|
.....664...998........343...............851............................2............414.....................3....................948.164....
|
|
......*..................*617....885...*....................-......250.........536..........470...#..................../4......=.....*......
|
|
...407...570..218................-.....654........776.....920.........*753...........566......*..347.....61.-979..786........935...42.......
|
|
.......%....*...$..311.102..........................*.907.....723...............622-....*..354..............................................
|
|
.....266..............*....987.554...........&....288...#......#.......................69......41..........486..-...........................
|
|
.849................................&........781...........978......724*..196..../767................725..../...892.....*355.....815.390....
|
|
....*......@.....*988......%........704...............*......&...........*...................826.....................243.......#....*.......
|
|
...796......729.9.........490..721....................438.=....272..54&...926..481..............*..523......&.785...........766.......*493..
|
|
........281.........706...........=.666.......505.........579.*................./...669.........73...*...639...*.......479.........514......
|
|
...........*...386.......375..................................525.926..$120............&.580.........457........325.......*829..............
|
|
.....758..662.......937....%...661.24......749*323...444.............*.............583....*.........................................223.....
|
|
.......*........665....*...........*................@.................154......965..*....119.......620*............347.................*470.
|
|
........391.........183.........75..783../....................209.312............*...362........./.....667..........*....77.................
|
|
...379=..........................$......261..228........907......*.......+591...178.........227.704........@771..667..........268......543..
|
|
.......................#.....................*..........*....................................-........*581...........101........*.....*.....
|
|
................471...545..135........432..178....$225..143...973#..322............2.................................*...........239...985..
|
|
......728*612...*.........*.....65....................................*...........*................&..............527....255+../............
|
|
..255.........435.304....854...................-............=........261......&...749....+......196....694......................779..271.374
|
|
......604.........*.....................708.....922.......76..82*554......991..19........456............*..582.........597@.................
|
|
.................374..*........*707........................................*....................609...52....%.................483...........
|
|
..../..................739......................$..........649...973.*511.861..20%.................=.....................148....*......343..
|
|
...978.................................282&...401......961....-.*.........................................499%.........../.....347..........
|
|
.................+..174..315.-819.................841.....*66......820.836......8....60....456........*........434..........................
|
|
....62%.......908......./.................770....../..................*.....852......&.....*........317...%......@.......+.......691........
|
|
........793......../......411......963.......*594..................@........@......*.......45.............729...........306.148....*..@.....
|
|
626.......$......35..........*........*...........................77.134........584.....23....35................589........./...482..853....
|
|
.......................366..668.........................238...........*..265.........*..........*...........&......*...471..................
|
|
..741.............679.................@.807...76....185*...........211..%.........507....178..583....*.561...521..620...*....865.$247.494...
|
|
.....*.....383.....%..183..876......179..$..................254.........................$..........697.*..............935...*...............
|
|
...50..390..*.........*.........917.........904/..50+.........................96...............960......701...............464....*.......947
|
|
.........*..53........270..........*647.342......................778............$..$684..+279...*....#.........................393..........
|
|
......151.......490...........352*.........*........................#............................594.732.........11....#....................
|
|
........................$.........306....805..................832...................859..../.#53.........953*228...*....217.................
|
|
......37....349....391.739.......................................*286..........558......516.......647........................%........847...
|
|
..346.../....*......&.......855.........732....586...353.................43....*..............598.&...798.719.........671.....881...........
|
|
..........561................=..........................*..........52....*.....727............./.....$....*..........*......................
|
|
999*..........746...158........534............927.....587.....521......511...........448%...89...........52..557......211..356.344...116....
|
|
........*.....................%........732....*..............*...............................*..................*806.......$.....*..*.......
|
|
.....575.515.......922..........410.......*................564...............+503...........297................................132.667......
|
|
.../.............-..#.....69*82....*.......842......248..&.......630.@........................................500...........................
|
|
..916.........944...................586.................647.......*...21....&419..........=....699.......766...%.......152.......315*101....
|
|
......*436...........987#.....*....................188.............81.............87..-..109......*.........-..........*....349.............
|
|
...553..........570-.......442.197.......115...590....*.......284.......478...459..#.6.........946...............945-..192............292...
|
|
22.......+..............................%......../...865........*......*........*..........900......950.......................*449...$......
|
|
.......780..........435...*................................371...588...727.....213.....496.............-.845*..../173......688..............
|
|
713........923..../.*......289....38.....408.552.141*476..*..................................619....6........238...................633......
|
|
...*821.......*..57.8............../..46*......*..........38.........%..................$...*.......*....201......=.............61...-..%86.
|
|
...........361......../12..39.51............903..................380..659........905+.28....256.............*......215.....=.../............
|
|
...-..577.......553...............749.246.........34....................................................311..282........894.................
|
|
.960.....@...........661.....558...&......239*..........482......574=..269..........289..../...............*.................323............
|
|
...........292................%.................#........../............*......452/.-......132.....=..342.721..335.....426....*.....516.....
|
|
................967.......=.......900...........925..........476.252/...861.....................891.....*.........*315.&.....130...=........
|
|
..955..........=........584.......*...-................600............$..........940.=348...............733...754...........................
|
|
.....*..123.....................76...36...430-......&...............524.........*............706..............#.....*.....849*......162*129.
|
|
..543.....*........903..290.........................42.......................649...$............+...78.*648......180.979......353...........
|
|
...........91.642.../....*........443/.........206...........#.......219............134............*..............................798..344..
|
|
......759................144..............................455........*...906...............195......924....502.405....802.400.......*.......
|
|
.812..............-..........394.............$771.245..............116........................*.+.........#....../...*.....*...448...883....
|
|
..................784................................*.....&.................809.......616..109.496.................89.....592...*..........
|
|
...596........671......527..483.197......-965.231.918.......921.452-.538.......*..763.........................162............../..479../685.
|
|
......*....46...#......*......*.@.............................................839.*......172.....................*374........927............
|
|
.....383............649.....783..........=981.........44..159.....94...............769......*..............#..........*.............748*993.
|
|
..................................................607.+...*......*.......................755..810........539.......728.98.....425...........
|
|
......32......35....99...233..............275.337.&......437..630...........423.84...........-............................163........578....
|
|
................+.....*.....+.....334.......*.-................................*..................110.....358....115..566....*648.......*...
|
|
....................471............*......384....81...190.606..=714....673.198.......57..#761........=..........*.....*..................618
|
|
..........847.755..................963..........*........*................*......251*....................#592.222....107...991..557.........
|
|
....236-.....*.................569.....311....584.............*958..........923%........................................./.......*....=.....
|
|
................../.835...................*........157*324.840......../415...................408...........212......-..573.549.770.995......
|
|
............312.34..............&.377...287.461..................+.................33*555...*................@.315.720......%...............
|
|
.......614.*.................309.....*........*..758............811..........................259.................+..................-627....
|
|
.........*.....*.....757.................684.527..*.......408.........999...............524..............570...............995..............
|
|
...835..415.345.822...............495.....*.......138...........966....*..................#...............*....560.........*................
|
|
...#.................806..954......*.......51...........+.......*.....910..436.477..............*150.....510...*.....#....537...........434.
|
|
......................*...-........871.743.........643...234...844............*....705..959..360................454..402..........984.......
|
|
....................491.................+..675...........................$........*........-................................487...*...876...
|
|
....191........%559.......................*........250..................965......556..&...........521.......365.......994%.%....923.....$...
|
|
.....*........................238..257...631..........*....*.....&...........346......366...150....*........*...............................
|
|
.....532....584....800.......*.................603.452..155.42..272..267.295*.....52...........*....672..743...830.....395.......862........
|
|
...............#....*.....347...................*......................@.......................487...................................671*973
|
|
......=340.......&..667...................*......413.........................576*888......706.......487..502..........22....................
|
|
................649..........&./426....286.............149........690..............................&..........765.....*..............321....
|
|
389........304/............200...................660...*.............*253...........129..#30.........................710.../................
|
|
...@..............408.............258*246....136.....614..531..-.....................*.........253&..........421...........939.....+.357....
|
|
.....%..............*...........................*............*..313..+418.47...931...329............974.........=...847..........166.*......
|
|
834..6.............346....505....164............833........66.....................*.......367..95......*211..............-............888...
|
|
.........535....=......+.....$.......770......+....................................5.......*.....*36..................547...+...............
|
|
.....115.*...471......863.............#.....75..364...........=842..974......722........581............$..........588.......557....760......
|
|
987..=...780...............$...................*......................................+......869.......591.......&................-.........
|
|
........................15.484..........640...768.@710.353.......=.585......&91....996..712..=...............548...680........661...939.....
|
|
...630...........186=...*......575.....*................#.....662..$.................................+......*.........+........../.....*....
|
|
.........116*235........138...*....................644....................*853...............210...719......503.....................453.....
|
|
.....................=.........480..%................=...........429...478.....695.....789..$..........19&............216...................
|
|
......506.........101...189.........232....951.........706....43...*.......943.........%...........935.......160..........+20..152.16.......
|
|
..............789...........654...............*648.............*...........*....=.............398...*........*................*.............
|
|
..............*.........509...@.....$...............746.....645...........607..336.................488....285....$..944......298.$..........
|
|
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#+end_src
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