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Day 8
+131
+2
src/aoc.gleam
+2
src/aoc.gleam
···
7
7
import days/day5
8
8
import days/day6
9
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import days/day7
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+
import days/day8
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import gleam/erlang
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import gleam/int
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import gleam/io
···
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5 -> day5.start()
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6 -> day6.start()
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7 -> day7.start()
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8 -> day8.start()
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_ -> io.println("Tried to run day " <> int.to_string(day))
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}
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birl.now()
+129
src/days/day8.gleam
+129
src/days/day8.gleam
···
1
+
import gleam/float
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import gleam/int
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+
import gleam/io
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import gleam/list
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+
import gleam/order
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import gleam/result
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import gleam/set
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import gleam/string
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import gleam_community/maths
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import simplifile
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pub fn start() -> Nil {
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let assert Ok(content) = simplifile.read("inputs/day8.txt")
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let data = parse(content)
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+
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let _ = io.debug(part1(data))
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let _ = io.debug(part2(data))
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+
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Nil
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}
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+
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type Coord {
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Coord(x: Float, y: Float, z: Float)
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}
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+
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fn parse(data: String) {
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string.split(data, "\n")
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|> list.map(fn(x) {
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let assert [x, y, z] =
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string.split(x, ",")
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|> list.map(fn(x) { int.parse(x) |> result.unwrap(0) |> int.to_float })
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Coord(x, y, z)
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})
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}
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+
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fn distance(c1: Coord, c2: Coord) -> Float {
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let to_root =
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{
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float.power(c1.x -. c2.x, 2.0)
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|> result.unwrap(0.0)
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}
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+. {
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float.power(c1.y -. c2.y, 2.0)
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|> result.unwrap(0.0)
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}
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+. {
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float.power(c1.z -. c2.z, 2.0)
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|> result.unwrap(0.0)
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}
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+
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float.square_root(to_root) |> result.unwrap(9_999_999_999_999_999_999.0)
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}
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fn part1(data: List(Coord)) {
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let circuits = list.map(data, fn(x) { set.from_list([x]) })
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list.index_map(data, fn(first, idx) {
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list.drop(data, idx + 1)
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|> list.map(fn(second) {
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let d = distance(first, second)
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#(first, second, d)
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})
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})
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|> list.flatten
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|> list.sort(fn(c1, c2) {
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case c1.2 <. c2.2 {
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True -> order.Lt
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_ ->
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case c1.2 == c2.2 {
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True -> order.Eq
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_ -> order.Gt
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}
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}
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})
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|> list.take(1000)
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|> list.fold(circuits, fn(acc, coords) {
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let #(c1, c2, _) = coords
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let assert Ok(s1) = list.find(acc, set.contains(_, c1))
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let assert Ok(s2) = list.find(acc, set.contains(_, c2))
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let acc =
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list.filter(acc, fn(x) { !{ set.contains(x, c1) || set.contains(x, c2) } })
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+
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[set.union(s1, s2), ..acc]
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})
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|> list.map(set.size)
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|> list.sort(int.compare)
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|> list.reverse
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|> list.take(3)
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|> list.fold(1, int.multiply)
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}
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+
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fn part2(data) {
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let circuits = list.map(data, fn(x) { set.from_list([x]) })
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list.index_map(data, fn(first, idx) {
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list.drop(data, idx + 1)
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|> list.map(fn(second) {
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let d = distance(first, second)
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#(first, second, d)
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})
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})
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|> list.flatten
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|> list.sort(fn(c1, c2) {
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case c1.2 <. c2.2 {
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True -> order.Lt
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_ ->
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case c1.2 == c2.2 {
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True -> order.Eq
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_ -> order.Gt
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}
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}
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})
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|> list.fold_until(circuits, fn(acc, coords) {
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let #(c1, c2, _) = coords
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let assert Ok(s1) = list.find(acc, set.contains(_, c1))
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let assert Ok(s2) = list.find(acc, set.contains(_, c2))
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let acc =
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list.filter(acc, fn(x) { !{ set.contains(x, c1) || set.contains(x, c2) } })
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+
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let new = [set.union(s1, s2), ..acc]
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case list.length(new) {
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1 -> list.Stop([set.new() |> set.insert(c1) |> set.insert(c2)])
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_ -> list.Continue(new)
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}
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})
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|> list.first
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|> result.unwrap(set.new())
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+
|> set.to_list()
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|> list.fold(1.0, fn(acc, x) { acc *. x.x })
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+
|> float.round
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+
}