AoC Day 3, Part 1 (Solved)
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🐙PiperYxzzy
33
2023/03/README.md
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33
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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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
Normal file
@@ -0,0 +1,140 @@
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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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||||
.......336...................*....563..993.911.=......853................*...............391...@572.................*.......*......614..*...
|
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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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|
||||
..........619...23........$...*.....138.893.......890...79....53.........118........966................+..............233............*......
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||||
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||||
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||||
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||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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||||
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|
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||||
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||||
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|
||||
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|
||||
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||||
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...*.........*.....&................/.....................222.........959................@..121.......*...930.......#.......170*462.....588.
|
||||
384....+..19.863..............407=.283.........972...340....#....427*....*737...........558...%.....91......*...........................=...
|
||||
.....812...@.........298..563....................*......*............506..........845......................634...&............624+...&......
|
||||
.....................*.....=.....*.............492.563...950..827*...............+....................968......652..................49......
|
||||
.730.........498..382.........399.......824.........&...................390.630........248...........*.......-......448......-..............
|
||||
................*......333..........832*.....#...............$...565.....*...............*............701..564.........*.115..718.......313.
|
||||
.960...*965....993......*.....*..............604..........730...*..................234&..662.....+..............=69.930...*.......967*......
|
||||
.....30..............355...978...........67.........419........239..........732...............645..........................484........664...
|
||||
Reference in New Issue
Block a user