AoC Day 3, Part 1 (Solved)
This commit is contained in:
🐙PiperYxzzy
33
2023/03/README.md
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2023/03/README.md
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## \-\-\- Day 3: Gear Ratios ---
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You and the Elf eventually reach a [gondola lift](https://en.wikipedia.org/wiki/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.
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It doesn't take long to find the gondolas, but there seems to be a problem: they're not moving.
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"Aaah!"
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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.
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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.
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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.)
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Here is an example engine schematic:
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```
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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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```
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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`.
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Of course, the actual engine schematic is much larger. _What is the sum of all of the part numbers in the engine schematic?_
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89
2023/03/code.go
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89
2023/03/code.go
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package main
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import (
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"strconv"
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"strings"
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"unicode"
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"github.com/jpillora/puzzler/harness/aoc"
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)
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func main() {
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aoc.Harness(run)
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}
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func getNumberAndBlank(schema [][]rune, x int, y int) int {
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if x < 0 || x >= len(schema) || y < 0 || y >= len(schema[x]) {
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// Out of bounds
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return 0
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}
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if !unicode.IsNumber(schema[x][y]) {
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// Not a number to start
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return 0
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}
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// Moves along y to find the first character...
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firstFound := false
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for !firstFound {
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if y == 0 || !unicode.IsNumber(schema[x][y-1]) {
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firstFound = true
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} else {
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y -= 1
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}
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}
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// then assemble
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numStr := ""
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for y < len(schema[x]) && unicode.IsNumber(schema[x][y]) {
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numStr += string(schema[x][y])
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schema[x][y] = '.'
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y += 1
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}
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num, _ := strconv.Atoi(numStr)
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return num
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}
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// on code change, run will be executed 4 times:
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// 1. with: false (part1), and example input
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// 2. with: true (part2), and example input
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// 3. with: false (part1), and user input
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// 4. with: true (part2), and user input
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// the return value of each run is printed to stdout
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func run(part2 bool, input string) any {
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// Assemble schematic
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schematic := make([][]rune, 0)
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for _, line := range strings.Split(input, "\n") {
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if line != "" {
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schematic = append(schematic, []rune(line))
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}
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}
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// when you're ready to do part 2, remove this "not implemented" block
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if part2 {
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return "not implemented"
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}
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// solve part 1 here
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// Go through array, if we find a non-number non-period, find all adjacent numbers and then turn those to periods
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engineSum := 0
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for x, _ := range schematic {
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for y, _ := range schematic[x] {
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if unicode.IsNumber(schematic[x][y]) || schematic[x][y] == '.' {
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continue
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}
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// Else, it's a symbol! Go around and, if there are any numbers, assemble them
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for xi := x - 1; xi < x+2; xi++ {
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for yi := y - 1; yi < y+2; yi++ {
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engineSum += getNumberAndBlank(schematic, xi, yi)
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}
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}
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}
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}
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return engineSum
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}
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10
2023/03/input-example.txt
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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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140
2023/03/input-user.txt
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140
2023/03/input-user.txt
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....401.............425.......323......791......697...............963............................................420........................
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...*..................................%......#.....*....290.........................492.............656...@953.....................+830.....
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..159...........823...33.717.....572.......806...896......-.....335....834......815.............791....*..............776...................
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.........-.....#........*.........*..................715..........*.....*........*.....................5...*.....................688........
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....=..=..573..............212.......553.632....622....*.......260....29.........692.129....727...........290.........%32.....%...*..441....
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.791..998..............................*............531.......................84.......*..../.......506%......=............240..831..*......
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.....................321.586........447...&.-276.21......@..........12.......&.......-..333...................619..94................982....
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..........@...........#..*..............525.......*...183............*............407.......23.........%............&......846..............
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....97..686.............89.....................-..494..............875....*607.............*.......239.407..................%.......529.....
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.....+.........815..703............208.=555.856...........@............133........................*..........672...501........898#...*......
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...............*.......*...659.......*....................183..............528.......614.......4....................................39......
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...602..........804..313....*.......480..............602.............354......*877................832@.....140...$...........707.......222..
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...*....999.................23.264..............516.....*.......-....*....................................*.....722......24....*........*...
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436....+................./......./..........765*......37.....843....218..........852*68....290............410...........*.....539....896....
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.........../...#........907............587...............&................149...............*.......*..............#780..707................
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........349....603.598....................-....203.....178.......431......./...............152......571....926.750.............127..........
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.............@........*176.283...................*...%......642......../......20..............................*.........@.............534...
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...749..../.194..............*.......337.395*....682.429.=...#..........186.....*.........682..../......498..........%.8.............*......
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....*..324..........893*...878......*........659..........65....671.189.......641...........+.859.........$.......149....648........53.+....
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...776......$.....................667.................432...........*..............697............282.901...................*889........471.
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............103............../........-..................-...748&.257.............&...........739*....*......491*543................997.....
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.........2.........813*.....278..316.333.....296.142.+...................673.%....../.....+.........490...................790........*......
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......@.*.......................*...............*....643.464............*....25....108..807..179.........931.......289..........365...522...
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....367.250.927../.............754.........14...............*.+..........23...................*......&.....*..%..........323................
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................939...644..............791..*.551....35...937..806...............&.............536.930...703...565......*...............*640
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534$.................*.........$..448.....=......*...................707*658.....33....920..74.....................844................36....
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.......572....672...875......770.+................380.............52......................*.......-....251............%........*909......677
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.......*.......=........................658.889.........882.....=......................534..*..291...%....*.................289.............
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.212......993..............438./..........*....@..532......*586.163....213...307...........167.....981.700..................................
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....*.....*..................-..12...611...196.......*309.....................+.......*685............................403....243..+385......
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59...428..14...22.747....990............*........575...............................247.....985....&..................*.......*..............
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.................*........%...539.......416.712.....*2..408.......%....................999.......275......738.....715......670..............
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..357........653..............*....374..........285................785.........384......*.............277*........................765.137...
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...@..........*..@632......361.......=..............35.........329..............................=858..............798.................*.....
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......................216*.......459..................*..........&........479.....255......302......................*.530.........269..453..
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............./.573........153.....*........#.......462...%..........45......+.122*............*672....545........157.....*862.....*.........
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820....%...977.+...................726...790.199.........631....308..................755..............*...460..................643....#237..
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.......229.............727..425............../..........................228........#..$...............385....&...........695................
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...................978.*....*....................700....*.........256..@.........625......311.170...+................642*...................
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.492.....983.........-.577.743..................*....267.521........%....479.......................696.980......................*...........
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....*820.#....................................236.................*......*...856.............137...........489......409........177..450.....
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974.........479.$......182..456......./.............*755..617..333.849.........*...............*..........*..........=...-...........*......
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...+..........*..83.#....@.=...........893.......610.........*.................727....6*..488.839...449..541../97......560.........449......
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............208......168......971..........................547..........559............................=...........237...................641
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.......336...................*....563..993.911.=......853................*...............391...@572.................*.......*......614..*...
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........$...........579.....810....-......*....480....*......649.138..410..201..604........*..............450#.....485...124.841..*......790
|
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..399...........928.............67..................#..295......*............*...#....333...83...#111.............................635.......
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...=........./.....*..807...529..*......642#......603......704.........@....599......&.................=....................................
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..............233.618..../........114........566......100..*.....423.26...............................168................555$..........#625.
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.....608*372..................543..........*.*............4.....*.......+374.......436*...................680.135....................*......
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.................................@...385.309..111......69....991..127........693#......985....25..856*96.+.......*860..........%..278.160...
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.......351.......495=.772..............*...............*...........*...........................@............569...............905...........
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........................*.$402........640.*.............366.........350...623&...250.............446*341.....=.........................292..
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....#..*...595.289...347..........75.......844......307..........................*....585.....*..................766+...................*...
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.148..906.....*..........232.449...*...........................................326..$...-..102.595.....406............-...........650....682
|
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..........619...23........$...*.....138.893.......890...79....53.........118........966................+..............233............*......
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.........*......../..........62..........*........*....*.............@..*....................245...........-....806.........98........318...
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....534+.264..993...420.................675..77..659..263..........615.405...............=..*......%..75...614.*..................4.........
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...............*..............421.........................834*287.......................813..651.902...*........134.....$...........334.....
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....631....=..443........................352..........941...............317.......*286...............562.855............690....387.....*....
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.27...$.430......................89....-....*90...&......%..........155.......899.......%59....*986.................775..............25.....
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...*....................-.....+...*...952.........62.........478...........&...../..........694.........775.....640..$......................
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....102..........+197....109.270.453.....................................641.......123..........573....*.......=............880.403+........
|
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.........87.186..........................709.+219........224.726...882.............*...868..203*....732............928*607..*...............
|
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..819....*..*.............*....81........*....................-../..%...+..........700.=.......................149............*....438..=...
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....#.875..223.106.........646......%.....519...579.............38.....883.626@....................149..........=..........205.272./....480.
|
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.......................965.........332.........*......221.292...........................594..945......*931..365....814*214..................
|
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..228*....29............*....79...........+.....811.....*..*..592..........681.............*....#.427........*................170..58.......
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......563...*........817..93*...+60..507...898........796.942...*..=335.......@...490....488.......-......974....817...........*....+.......
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...........519..&...................*..........948.............454......184.........*.........=.......................409......947..........
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...............272..........257....712............+.@.....338..............*381...824..923..756.............971*181....=....+......430......
|
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....228.............709.......&......................685.....*..597....135......+.....*..........+......471..................452..*......923
|
||||||
|
....*..................#...........271.....................167.*.........*.......325.935..........224......*.....749&...-..........587......
|
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..464.../199..$..........50...........*..794..........36.......733....................................@....414...........605................
|
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...............765.%.......=.215*717........*715....................210......845.......................643........66...........*908.........
|
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.........215........761............................544....781...390*.....576..*....869..781....517................*.....356.664.......=.....
|
||||||
|
..............316...........235/...............715*.....-....*.............*..130..........*..@..........&.........564.*...............89...
|
||||||
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...................................&....169...........353....390....57.71.847...........716.........466..516..651......447..................
|
||||||
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.......459..................101.379.....*......324...................#.#............943..............*...........%.........$625.../...586...
|
||||||
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........*.....173...................198..306...*....313........51............629...*..........-958..228.178.......................967.......
|
||||||
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......714...@.........206.......934*.........109...........*.........../......*....832...................*........934.....921..........897..
|
||||||
|
...........487............700......................*507..415....349%...179...961................437.......489.......*............../...*....
|
||||||
|
.................*440.952*................667...533.....................................359.618....*927.........................968...412...
|
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...........-..778..................667.....@..........764..401.........279.......#.748.....*................534*.....444....................
|
||||||
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...835..779......../.....443.........*.........................53/......=......774......=....784...204..385.....929..........+...861........
|
||||||
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......%..........74..947*.....187&.874..........&.........................545........752.......$....$...*..................308.....*..284...
|
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........#.................190...........445$..784...51*226...................*............*245..........435.......=...200..........88.*.....
|
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640.....310...&...........*......296..........................................107......943..........244...........662......=..440+....302...
|
||||||
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...*..........67........381..............856....349...........790*...911........................901...*......733........844.................
|
||||||
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.327..............885........169.....419........*.....62..........70..@..664...........=...422%...*....617.....*....................230*....
|
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...........916...@.............................95....@.....+.........................355.........104...........149......................569.
|
||||||
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.............*.........................230.../..............350..............................432.....710............=.........=.............
|
||||||
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..925..545..634.....@..297*933...........*....839...33...........34.....162.......577..248.....#...........814...524..........790......9/...
|
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...*...............66....................421............606+..*../.......&.........*....&..129..............=......................529......
|
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659..........253...........$504.......*......................379....&........./..860......+..............&...............%.....658*....310..
|
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........208...*........................354..........................647......326...............911.....503.......11.......293...............
|
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....*.....&.617..511.........885.906......................166/......................589..........*..........749....*931..........915........
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.852.908........................*................../........................297.470*........#628..269...613......#................*.........
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.........................716.................689...460...737*502...510.............../...........................778.......373..734.....+...
|
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..520=.........../.....*....*226........326.....+.................+............971...362........800$..904.303.........*874..........=..548..
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............554.889.720.854......808.....*..258............284*........639/...*...........................*........603.............839......
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...........*........................*690.71..*.........314.....795.86.........53.................786%...134...................890*..........
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663.....225...%........513...................951..........*........*...............275.995...764.....................=............30........
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...*...........353....*...........%......................468.....87..225........31..=.....%.=......../.......886.....84.....................
|
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..694......166........243........380...275..287..............261.....@.....888....*............162...278.......&..........351.534........197
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........$.......209.-......261...........*.......876.....15.....*.........*........712.....870...*.......897.....46...........#.............
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......450.........%..463.....%.679....119.....=.*....@...@.........871...408..995*...........*...922.+..........*...66.466..................
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..............803.........................$.250...493...............&.............356.519.552........737.......153....*.............+.......
|
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......982........*.....................540...................641.......................*......&....................................851../...
|
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|
..............638..............=.306....................+938..@................*520....511.174......*..........-......*503...832.........219
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............638..............................589.....................................=..312..+....951..........=..........809*..........#...
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.............@............325..........322.........&......................508......359......768........8..&.........992.....................
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...............395.579............340......*........386.=...420..............*........833..835........257...842....................810...635
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......#......................%...........983...632.@........*........-...%..157...193*...........................@..137....209..............
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................592....../............*......../.............................922.......350........138.156*............698...78*.........$571
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....................405/..573.764....257.@940...34.977$..441....304.............*.....*................................*.......93..600......
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.....812...@.........298..563....................*......*............506..........845......................634...&............624+...&......
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.960...*965....993......*.....*..............604..........730...*..................234&..662.....+..............=69.930...*.......967*......
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|
.....30..............355...978...........67.........419........239..........732...............645..........................484........664...
|
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Reference in New Issue
Block a user