Add Day 3 Problem 2
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12fdb62e53
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6e688509df
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C8F00588EE6ED1FE
140
3/2/input.txt
Normal file
140
3/2/input.txt
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.........426.............985.........40..........207............................841..463................................633........17.384...
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531&......+..........125....-..312..........#........895......998..945.....@......$.....-...33...................353.....*........*.........
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........................#......*...........21..727..*..../..-./.............545......80...................602......@..272.......743.........
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..............*.........243.................287................*............$....245............830.........793......#..........306..*......
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238.685.................*................#.........%........807.........28.947.................*.....705.....*....573...500*781...#..496....
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...........=......*..........886.*.........................442......*...........398........*.............%.............636...........%......
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............976.413...498..../...266........796....................87.....................969.881..&.....815...........*.....279....415.....
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..........257.....712.491....-41...........970........*....*...373........742.......*....330....................*.....................814...
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....................*..................415......406..441..35..../.........-..........828.........................239.....@...533*206........
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......687.........834......448...658...*..........&..................467*..................244.......+332....*..........35..............*...
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.............453.......616..*...........609.............662......672.....56........661.602*...............549.661...................141..73.
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.......699...*.........*...904..........................&..........*...@..............................189..........$677.......473.....*.....
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........*..670.........938.........267.......684...........514...211....875.........667..171.110&.426*......../...............*........29...
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.....164..........................*....@786.*..........646.=.........43.......885....+...=.............641.....996...........117....28......
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.........*921....150*....635..973............587...346*......771........&3....+....................=................................@.......
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......962............821....*...*...........................$....174............391+......732*177...101.....146.............555.............
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..........................117.965.........327.....................*../127.54.........354.....................*...37/.......&....56....656...
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.335.747*967..*469.................................-.....$.450..560...........553...+.......327*..........215.........950..............-....
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......................253%...........796.........267...946..*........&...583.-...........-......727.37........@....#....-.......337.........
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.............-...............-.649.........-.................316..680......*.....982..398..................961......632...718......*..%.....
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..........599.............876......700..617....344*138...611..........907........-...........................................*...291...209..
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.860...........................*......*......................850........*..............=....761...721*804...............%...33..............
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...*...........................61./....378........268....956..#..813@..191...610.168..216....$...............853%......826..................
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.757..=422.........................427..........+....%....=...................#.../..............908................@.......................
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.........................172.................464...........................-.....................*.......667...931...131..@.........939.....
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............456.....462....*.....985................801......933..464..641.874............*189..42.........................430..596...=.....
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..............*....%........945.@........456....*23...........*..........*.............335.........889..557#....................*...........
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....810.........65......382................#.532...............704......796...192....................@..........46...527......929...........
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...=....%..................*433...........................925.............................................30.....*................617.......
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.....792.......386.....................575...%859................................................................993...334*..........&......
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..........657.&.....&....................*.....................296.+513.............36..........267........703.............186..............
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......336...........443...#.....474......897.215*346.....100.....=...........+.812../......47.%....*444..&............128........-...196....
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705.............980......932.......*122..................*...........305..817..*......424.../.40.........193.210.736.*..../....&.512..*.....
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...%...............*.....................................326..615.......*.......472..*...........350*201.......*..@....681...902......330...
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...................907...303...........140*112.............../........93...875......339....361=.............730.............................
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..............540...........*...................498.170.....................*....................#...757........241...............201.......
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...359*42.....=.......309...561....528.....444.....*........570............................125/.379......707.......*........*285.$..........
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............%.........................*770.............253..*....515..926..................................=........45.946..............*...
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....155..573..103.24..............................@......*...179..*........275......................*...................*................134
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....*............*......963...........444......801...656.796.....524.84#......*433.......997.....122.500....711.......447...................
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..80.........992..........*............*...+..........*....................................*.................*...............$.....894...61.
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........183..../.......492..955....+.222....519........373....=......304........151.........691..............655......223....37......*......
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.........$...................&..221................859.....929.......*...398.......*......-......591.....&.............$..........134.......
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................960......264........./..............#..............508...@........118..449........*...907......=791.........................
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...........239....#.....=...........248.531...................@..................................696.......741...................50..174....
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.....=......*............................*.....506*809.....796.....906.....=...........17*...........51...*.......................*..*......
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...520...198...781....253..............957.222.....................*.....216..............513....959*....638.312........172.318......514....
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...............*.........*239...............*.....%.....923.........852..............414+............../.....%...104.......*.............936
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.....221.....116.....712...........201...346...475.........*...............&..............745....109..202...........*.......................
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....*............957*.....$....353...............................171....468....%..........*.........*.........906..593..592#......&316......
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.........232...........251....#.......%.......................$...*...........179..904.....365.....331..541..*..............................
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...................................856..........412..-....844.877..871....*.........../.................*....416...........810*685..776.969.
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.158.......@......319........681..........780.#...+...428.*............650.241....@....................................123.............*....
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....%....826......@....%.688*.......983../....723.........892...................270.....234....*......443...970...........*.................
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....................314................*.................................................*..=...588......*.....%........225...496*732.......
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...344+........................644......413.997....553...................................87.282..........943........866.....................
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..........*563....910......267..*..546........*.....*..................60.............+..........421*739.............*...251.169.605........
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938.....52...........*761.*....762............335....842.....................44/.......528..........................77......*.......*201....
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..........................597......$.....................896.....543.76.........................938./707...............8........982.........
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.............933.....................*.....838..240..400&..........288.......196..109............*.......749...513........*.......751...*...
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.....709.....................881..905.........*....*.....................643..*.....@...114...608......................190..........*....993
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...............109...........*........368..123....98...501.....691..410-...*.126......................92........+..546...........219........
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..........589.......................723.........832.131..705.............................#............*.................@......*...*..*.....
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..........*........794*686......790...............*..........192..............................970......612.546.98............942......941...
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..............-........#...911......494...*...355...159.......................848..676.................../.....*......35....................
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760.................*...#........331.................%...158...................#.....................29.................596...477...........
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..........%./....922...388..970...............510...68......*....590....545...621...-..977.593..889...*.........................=..879..*389
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.............................835.....129...566.....690.237..............#.............$.....386....36......#......411.....52..733...783.....
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.........670...978.84...........=......*.......991*....*....632.......957...52.......548.....&....................*.........-.*.............
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.........................253.............................................*.....459..........926..*.......446..............$.......175.......
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415............393..................988...........878.22..............909..........284...............173...564*48.......33.............444..
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........259..........%.....207-........*631...........*......669*...................*...........282......%........%.....*...................
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.130................119.....................422......440.........461...-154........575.............$.=....329...180..576.....367............
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...........618...............=.../..538$.......&............493*............729..........903.........82.......................*.............
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........231.891...........*.....782.....................*992.............492......69.......610...............+...............557......*.....
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............*...964.104.289..........853......691..830.......&.....................*...870.*.............77..189.310*...............583.....
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...............21.......................239........430..........@....*.....@..376.......205......790........................73..334...598...
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..........................257....*.................274.........247...........951........................121........391....817.../...........
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.......................659................................*.622...868.............=...713.357....*.298....917...781.........................
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42
3/2/puzzle.txt
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42
3/2/puzzle.txt
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--- Part Two ---
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The engineer finds the missing part and installs it in the engine! As the engine
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springs to life, you jump in the closest gondola, finally ready to ascend to the
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water source.
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You don't seem to be going very fast, though. Maybe something is still wrong?
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Fortunately, the gondola has a phone labeled "help", so you pick it up and the
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engineer answers.
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Before you can explain the situation, she suggests that you look out the window.
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There stands the engineer, holding a phone in one hand and waving with the
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other. You're going so slowly that you haven't even left the station. You exit
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the gondola.
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The missing part wasn't the only issue - one of the gears in the engine is
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wrong. A gear is any * symbol that is adjacent to exactly two part numbers. Its
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gear ratio is the result of multiplying those two numbers together.
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This time, you need to find the gear ratio of every gear and add them all up so
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that the engineer can figure out which gear needs to be replaced.
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Consider the same engine schematic again:
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467..114..
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...*......
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..35..633.
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......#...
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617*......
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.....+.58.
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..592.....
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......755.
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...$.*....
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.664.598..
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In this schematic, there are two gears. The first is in the top left; it has
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part numbers 467 and 35, so its gear ratio is 16345. The second gear is in the
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lower right; its gear ratio is 451490. (The * adjacent to 617 is not a gear
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because it is only adjacent to one part number.) Adding up all of the gear
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ratios produces 467835.
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What is the sum of all of the gear ratios in your engine schematic?
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125
3/2/solution.sh
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125
3/2/solution.sh
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#!/usr/bin/env bash
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set -o errexit
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set -o nounset
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set -o pipefail
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if [[ "${TRACE-0}" == "1" ]]; then
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set -o xtrace
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fi
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LINES=$(wc -l < "$1")
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COLUMNS=140
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mapfile -t -O 1 INPUT < "$1"
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declare -a gear_ratios
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find_gears ()
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{
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# Find and append gear ratios to array.
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for ((line=1; line<=LINES; line++)); do
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for ((column=1; column<=COLUMNS; column++)); do
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if [[ $(arr "${line}" "${column}") =~ ^\*$ ]]; then
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declare -i ratio=1
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declare -a adjacent=()
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for ((i=column-1; i<=column+1; i++)); do # check above
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if [[ $(arr $((line-1)) "${i}") =~ ^[0-9]$ ]]; then
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number="$(arr $((line-1)) "${i}")"
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for ((j=i-1; j>i-3; j--)); do # check before i, numbers are max 3-digit
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if [[ $(arr $((line-1)) "${j}") =~ ^[0-9]$ ]]; then
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number="$(arr $((line-1)) "${j}")${number}"
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else
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break
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fi
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done
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add_to_i=0
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for ((k=i+1; k<i+3; k++)); do # check after i
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if [[ $(arr $((line-1)) "${k}") =~ ^[0-9]$ ]]; then
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number="${number}$(arr $((line-1)) "${k}")"
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add_to_i=$((add_to_i+1))
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else
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break
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fi
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done
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i=$((i+add_to_i))
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adjacent+=("${number}")
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fi
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done
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for ((i=column-1; i<=column+1; i++)); do # check below
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if [[ $(arr $((line+1)) "${i}") =~ ^[0-9]$ ]]; then
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number="$(arr $((line+1)) "${i}")"
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for ((j=i-1; j>i-3; j--)); do # check before i
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if [[ $(arr $((line+1)) "${j}") =~ ^[0-9]$ ]]; then
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number="$(arr $((line+1)) "${j}")${number}"
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else
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break
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fi
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done
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add_to_i=0
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for ((k=i+1; k<i+3; k++)); do # check after i
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if [[ $(arr $((line+1)) "${k}") =~ ^[0-9]$ ]]; then
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number="${number}$(arr $((line+1)) "${k}")"
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add_to_i=$((add_to_i+1))
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else
|
||||
break
|
||||
fi
|
||||
done
|
||||
i=$((i+add_to_i))
|
||||
adjacent+=("${number}")
|
||||
fi
|
||||
done
|
||||
if [[ $(arr "${line}" $((column-1))) =~ ^[0-9]$ ]]; then # check before gear
|
||||
number="$(arr "${line}" $((column-1)))"
|
||||
for ((i=column-2; i>column-4; i--)); do # search for beginning
|
||||
if [[ $(arr "${line}" "${i}") =~ ^[0-9]$ ]]; then
|
||||
number="$(arr "${line}" "${i}")${number}"
|
||||
else
|
||||
break
|
||||
fi
|
||||
done
|
||||
adjacent+=("${number}")
|
||||
fi
|
||||
if [[ $(arr "${line}" $((column+1))) =~ ^[0-9]$ ]]; then # check after gear
|
||||
number="$(arr "${line}" $((column+1)))"
|
||||
for ((i=column+2; i<column+4; i++)); do # search for end
|
||||
if [[ $(arr "${line}" "${i}") =~ ^[0-9]$ ]]; then
|
||||
number="${number}$(arr "${line}" "${i}")"
|
||||
else
|
||||
break
|
||||
fi
|
||||
done
|
||||
adjacent+=("${number}")
|
||||
fi
|
||||
if [[ ${#adjacent[@]} -gt 1 ]]; then
|
||||
for number in "${adjacent[@]}"; do
|
||||
ratio=$((ratio*number))
|
||||
done
|
||||
gear_ratios+=("${ratio}")
|
||||
fi
|
||||
fi
|
||||
done
|
||||
done
|
||||
}
|
||||
|
||||
arr ()
|
||||
{
|
||||
# Usage: arr LINE COLUMN
|
||||
line="$1"
|
||||
column=$(($2-1))
|
||||
if ((line<=0)) || ((line>LINES)) || ((column<0)); then
|
||||
echo -n ''
|
||||
else
|
||||
echo -n "${INPUT[${line}]:${column}:1}"
|
||||
fi
|
||||
}
|
||||
|
||||
|
||||
main ()
|
||||
{
|
||||
find_gears
|
||||
sum=0
|
||||
for number in "${gear_ratios[@]}"; do
|
||||
sum=$((sum+number))
|
||||
done
|
||||
echo "${sum}"
|
||||
}
|
||||
|
||||
main
|
||||
Loading…
Reference in New Issue
Block a user