2023 Day 3 Complete!
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package main
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import (
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"fmt"
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h "git.bullercodeworks.com/brian/adventofcode/helpers"
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)
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func main() {
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inp := h.StdinToStringSlice()
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part1(inp)
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part2(inp)
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}
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func part1(input []string) {
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bm := h.StringSliceToCoordByteMap(input)
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symbols := bm.FindAllNot('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '.')
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// Gather a list of numbers that are adjacent to the symbols
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nums := make(map[h.Coordinate]int)
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for k, _ := range symbols {
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wrk := findPartNumsFrom(bm, k)
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for coord, val := range wrk {
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nums[coord] = val
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}
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}
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var sum int
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for _, v := range nums {
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sum += v
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}
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fmt.Println("# Part 1")
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fmt.Println(sum)
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}
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func part2(input []string) {
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bm := h.StringSliceToCoordByteMap(input)
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maybeGears := bm.FindAll('*')
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var ratioSum int
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for _, k := range maybeGears {
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wrk := findPartNumsFrom(bm, k)
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if len(wrk) != 2 {
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// It's not a gear
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continue
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}
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var second bool
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var ratio int
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for _, v := range wrk {
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if !second {
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ratio += v
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second = true
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} else {
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ratio *= v
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}
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}
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ratioSum += ratio
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}
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fmt.Println("# Part 2")
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fmt.Println(ratioSum)
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}
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func findPartNumsFrom(m h.CoordByteMap, c h.Coordinate) map[h.Coordinate]int {
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partNums := make(map[h.Coordinate]int)
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for _, chk := range []h.Coordinate{
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c.North(),
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c.NE(),
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c.East(),
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c.SE(),
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c.South(),
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c.SW(),
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c.West(),
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c.NW(),
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} {
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if m.Get(chk) >= '0' && m.Get(chk) <= '9' {
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v, pos := parseNumAt(m, chk)
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partNums[pos] = v
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}
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}
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return partNums
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}
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// parseNumAt returns the number at c and the Coordinate
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// that the first digit of that number is at
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func parseNumAt(m h.CoordByteMap, c h.Coordinate) (int, h.Coordinate) {
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var resStr string
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startCoord := c
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// From 'c' move left until we find the first digit
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chk := m.Get(startCoord)
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for coordIsNum(m, startCoord) {
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startCoord = startCoord.West()
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chk = m.Get(startCoord)
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}
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startCoord = startCoord.East()
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// Now put the number at 'startCoord' together
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parseNum := startCoord
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chk = m.Get(startCoord)
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for coordIsNum(m, parseNum) {
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resStr = fmt.Sprintf("%s%s", resStr, string(chk))
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parseNum = parseNum.East()
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chk = m.Get(parseNum)
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}
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if resStr == "" {
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return -1, h.Coordinate{X: -1, Y: -1}
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}
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return h.Atoi(resStr), startCoord
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}
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func coordIsNum(m h.CoordByteMap, c h.Coordinate) bool {
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wrk := m.Get(c)
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return wrk >= '0' && wrk <= '9'
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}
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@ -0,0 +1,110 @@
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Advent of Code
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br0xen (AoC++) 6*
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--- Day 3: Gear Ratios ---
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You and the Elf eventually reach a gondola lift station; he says the gondola lift will take you up to the water source, but
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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.
|
||||
|
||||
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:
|
||||
|
||||
467..114..
|
||||
...*......
|
||||
..35..633.
|
||||
......#...
|
||||
617*......
|
||||
.....+.58.
|
||||
..592.....
|
||||
......755.
|
||||
...$.*....
|
||||
.664.598..
|
||||
|
||||
In this schematic, two numbers are not part numbers because they are not adjacent to a symbol: 114 (top right) and 58
|
||||
(middle right). Every other number is adjacent to a symbol and so is a part number; their sum is 4361.
|
||||
|
||||
Of course, the actual engine schematic is much larger. What is the sum of all of the part numbers in the engine schematic?
|
||||
|
||||
Your puzzle answer was 543867.
|
||||
|
||||
--- Part Two ---
|
||||
|
||||
The engineer finds the missing part and installs it in the engine! As the engine springs to life, you jump in the closest
|
||||
gondola, finally ready to ascend to the water source.
|
||||
|
||||
You don't seem to be going very fast, though. Maybe something is still wrong? Fortunately, the gondola has a phone labeled
|
||||
"help", so you pick it up and the engineer answers.
|
||||
|
||||
Before you can explain the situation, she suggests that you look out the window. There stands the engineer, holding a phone
|
||||
in one hand and waving with the other. You're going so slowly that you haven't even left the station. You exit the gondola.
|
||||
|
||||
The missing part wasn't the only issue - one of the gears in the engine is wrong. A gear is any * symbol that is adjacent
|
||||
to exactly two part numbers. Its gear ratio is the result of multiplying those two numbers together.
|
||||
|
||||
This time, you need to find the gear ratio of every gear and add them all up so that the engineer can figure out which gear
|
||||
needs to be replaced.
|
||||
|
||||
Consider the same engine schematic again:
|
||||
|
||||
467..114..
|
||||
...*......
|
||||
..35..633.
|
||||
......#...
|
||||
617*......
|
||||
.....+.58.
|
||||
..592.....
|
||||
......755.
|
||||
...$.*....
|
||||
.664.598..
|
||||
|
||||
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?
|
||||
|
||||
Your puzzle answer was 79613331.
|
||||
|
||||
Both parts of this puzzle are complete! They provide two gold stars: **
|
||||
|
||||
At this point, you should return to your Advent calendar and try another puzzle.
|
||||
|
||||
If you still want to see it, you can get your puzzle input.
|
||||
|
||||
You can also [Shareon Twitter Mastodon] this puzzle.
|
||||
|
||||
References
|
||||
|
||||
Visible links
|
||||
. https://adventofcode.com/
|
||||
. https://adventofcode.com/2023/about
|
||||
. https://adventofcode.com/2023/events
|
||||
. https://teespring.com/stores/advent-of-code
|
||||
. https://adventofcode.com/2023/settings
|
||||
. https://adventofcode.com/2023/auth/logout
|
||||
. Advent of Code Supporter
|
||||
https://adventofcode.com/2023/support
|
||||
. https://adventofcode.com/2023
|
||||
. https://adventofcode.com/2023
|
||||
. https://adventofcode.com/2023/support
|
||||
. https://adventofcode.com/2023/sponsors
|
||||
. https://adventofcode.com/2023/leaderboard
|
||||
. https://adventofcode.com/2023/stats
|
||||
. https://adventofcode.com/2023/sponsors
|
||||
. https://en.wikipedia.org/wiki/Gondola_lift
|
||||
. https://adventofcode.com/2023
|
||||
. https://adventofcode.com/2023/day/3/input
|
||||
|
|
@ -0,0 +1,10 @@
|
|||
467..114..
|
||||
...*......
|
||||
..35..633.
|
||||
......#...
|
||||
617*......
|
||||
.....+.58.
|
||||
..592.....
|
||||
......755.
|
||||
...$.*....
|
||||
.664.598..
|
||||
Loading…
Reference in New Issue