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day 12 tidied

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Joshua Seigler 2024-12-12 14:17:33 -05:00
parent 54414dce26
commit 6490326b05
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2 changed files with 54 additions and 77 deletions
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6
.aocrunner.json
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@ -176,17 +176,17 @@
{
"part1": {
"solved": true,
"result": null,
"result": "1461752",
"attempts": [
"813344"
],
"time": null
"time": 172.252042
},
"part2": {
"solved": true,
"result": "904114",
"attempts": [],
"time": 220.713667
"time": 214.983875
}
},
{

125
src/day12/index.ts
View file

@ -9,12 +9,14 @@ const orthogonals = [
[1, 0], // down
[0, -1], // left
]
const diagonals = [
[-1, 1], // up right
[1, 1], // down right
[1, -1], // down left
[-1, -1], // up left
]
const getNeighbors = (r: number, c: number) => {
return orthogonals.map(([dr, dc]) => [r + dr, c + dc])
}
@ -22,6 +24,11 @@ const getNeighbors = (r: number, c: number) => {
const getKey = (items: unknown[]) => {
return items.join(",")
}
const unpackKey = <T>(key: Key, mapper: (input: string) => T) => {
return key.split(",").map(mapper)
}
type Key = ReturnType<typeof getKey>
type Region = {
@ -31,11 +38,10 @@ type Region = {
plots: Key[]
}
const part1 = (rawInput: string) => {
const input = parseInput(rawInput)
const getRegions = (map: string[][]) => {
let regions = new Set<Region>()
input.forEach((row, r) => {
map.forEach((row, r) => {
row.forEach((symbol, c) => {
const key = getKey([r, c])
const neighbors = getNeighbors(r, c).map(getKey)
@ -69,7 +75,12 @@ const part1 = (rawInput: string) => {
regions.add(newRegion)
})
})
return Array.from(regions).reduce(
return regions
}
const part1 = (rawInput: string) => {
const input = parseInput(rawInput)
return Array.from(getRegions(input)).reduce(
(total, region) => total + region.perimeter * region.area,
0,
)
@ -77,47 +88,12 @@ const part1 = (rawInput: string) => {
const part2 = (rawInput: string) => {
const input = parseInput(rawInput)
let regions = new Set<Region>()
const regions = getRegions(input)
input.forEach((row, r) => {
row.forEach((symbol, c) => {
const key = getKey([r, c])
const neighbors = getNeighbors(r, c).map(getKey)
let touches = 0
let matchingRegions: Region[] = []
regions.forEach((region) => {
if (region.symbol !== symbol) return
const newTouches = region.plots.filter((c) =>
neighbors.includes(c),
).length
if (newTouches > 0) {
touches += newTouches
matchingRegions.push(region)
regions.delete(region)
}
})
const newRegion = matchingRegions.reduce<Region>(
(acc, cur) => {
acc.area += cur.area
acc.perimeter += cur.perimeter
acc.plots.push(...cur.plots)
return acc
},
{
symbol,
area: 1,
perimeter: 4 - 2 * touches,
plots: [key],
},
)
regions.add(newRegion)
})
})
return Array.from(regions).reduce((total, { symbol, plots, area }) => {
return Array.from(regions).reduce((total, { plots, area }) => {
let corners = 0
plots.forEach((plot) => {
const [r, c] = plot.split(",").map(Number)
const [r, c] = unpackKey(plot, Number)
const orthogonalProbes = getNeighbors(r, c)
.map(getKey)
.map((k) => plots.includes(k))
@ -144,38 +120,39 @@ const part2 = (rawInput: string) => {
}
run({
// part1: {
// tests: [
// {
// input: `AAAA
// BBCD
// BBCC
// EEEC`,
// expected: 140,
// },
// {
// input: `OOOOO
// OXOXO
// OOOOO
// OXOXO
// OOOOO`, expected: 772
// },
// {
// input: `RRRRIICCFF
// RRRRIICCCF
// VVRRRCCFFF
// VVRCCCJFFF
// VVVVCJJCFE
// VVIVCCJJEE
// VVIIICJJEE
// MIIIIIJJEE
// MIIISIJEEE
// MMMISSJEEE`,
// expected: 1930
// }
// ],
// solution: part1,
// },
part1: {
tests: [
{
input: `AAAA
BBCD
BBCC
EEEC`,
expected: 140,
},
{
input: `OOOOO
OXOXO
OOOOO
OXOXO
OOOOO`,
expected: 772,
},
{
input: `RRRRIICCFF
RRRRIICCCF
VVRRRCCFFF
VVRCCCJFFF
VVVVCJJCFE
VVIVCCJJEE
VVIIICJJEE
MIIIIIJJEE
MIIISIJEEE
MMMISSJEEE`,
expected: 1930,
},
],
solution: part1,
},
part2: {
tests: [
{