Browse Source

2020 Day 24 Complete

I made some minor changes to helpers/coordinate... I probably need to go
back and fix several previous years/days.
master
Brian Buller 9 months ago
parent
commit
10a3ba0699
  1. 539
      2020/day24/input
  2. 124
      2020/day24/main.go
  3. 20
      2020/day24/testinput
  4. 8
      helpers/coordinate.go
  5. 14
      helpers/helpers.go

539
2020/day24/input

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nwsenenwnwwnesweseswnesenwnwnenewsew
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seeseswsesenwsesenwnweswswswswsewswsene
nwnwnwswnenwnenwnwnenenwnesenwesenwwnew
nwnwwnwnwnwnwwenwsenwnwwwnwnwwnwnwnw
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neswwwswwwswswsenewswswwwwwswwsw
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swswwswesewswnwswswswwsww
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wsesesesesesesesesesesesesesee
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nwnwnwnwnenwnwenwnwneeswnwnwnwnwswnwnwnwnw
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nwnenwnwnwnenwnwsenwnwnwnenenw
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nweesewseweseenwseseee
nwnenwnwnenenenwnwswnenwsenwnenwnwnwwnenw
nwnenwnwnwnwsenwnwnwsewnwnwnwnwnwnwnwnw
nenwnwnwnwswnenwnwnwnwenwnwnwnwnwnenenw
sweeeeeneneweeeeeeneeeenw
neswsewnenwneswnenenenenwnwenenwnwnenwne
nwwnwswnwswnwnwnwnwnwnwnwnwnenwnwnwnenw
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sweswnwwswswswnweswswneswseswswswsesw
swneswswwwswwswewewwswwwwwnese
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nenwnewweewnwnwswnwwsewwwswsenw
seseeewewseseseseseseesesesesesesese
swseswseswswseseswnwseneseeswnweswsesw
wenwnwnwnwnwnwsenwnwnwwwwnwwnwnwswne
nenenenenwnenwnewnenwswnwneneneneneenenw
nwnenenenesenwsenewnewnenwnesenenwnenenw
neneneneeneesweeeneneneneeswenwne
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swneseewneseswnwneenwswseseseeswese
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nwnwnwswnwnwnwnenenenwnwnwnwnwnwnwsenwsw
swnwwwnwewwwnwnwwnewwwwnwwnw

124
2020/day24/main.go

@ -0,0 +1,124 @@
package main
import (
"fmt"
h "git.bullercodeworks.com/brian/adventofcode/helpers"
)
const (
White = iota
Black
)
var tiles map[h.Coordinate]bool
func init() {
tiles = make(map[h.Coordinate]bool)
}
func main() {
fmt.Println("# Day 22")
inp := h.StdinToStringSlice()
solve(inp, h.Atoi(h.OptArgNumber(1, "2")))
}
func solve(inp []string, part int) {
buildTiles(inp)
if part == 1 {
fmt.Println("## Part 1\nAnswer:", len(tiles))
} else {
for day := 1; day <= 100; day++ {
next := make(map[h.Coordinate]bool)
lx, ly, hx, hy := getBordering()
for y := ly; y <= hy; y++ {
for x := lx; x <= hx; x++ {
tst := h.Coordinate{X: x, Y: y}
_, ok := tiles[tst]
bl := CountTiles(GetAllNeighborCoords(tst))
if (ok && !(bl == 0 || bl > 2)) || (!ok && bl == 2) {
next[tst] = true
}
}
}
tiles = next
fmt.Printf("Day %d: %d\n", day, len(next))
}
}
}
func getBordering() (int, int, int, int) {
lx, ly, hx, hy := h.MAX_INT, h.MAX_INT, h.MIN_INT, h.MIN_INT
for k := range tiles {
lx = h.Min(lx, k.X)
ly = h.Min(ly, k.Y)
hx = h.Max(hx, k.X)
hy = h.Max(hy, k.Y)
}
return lx - 1, ly - 1, hx + 1, hy + 1
}
/*
o o
o o o
o o
*/
func buildTiles(inp []string) {
for k := range inp {
curr := h.Coordinate{}
var last rune
for _, r := range inp[k] {
if r == 'n' || r == 's' {
last = r
continue
}
curr = GetNeighborCoord(curr, last+r)
last = 0
}
if v := tiles[curr]; v {
delete(tiles, curr)
} else {
tiles[curr] = true
}
}
}
func CountTiles(c []h.Coordinate) int {
var ret int
for _, v := range c {
if _, ok := tiles[v]; ok {
ret++
}
}
return ret
}
func GetAllNeighborCoords(c h.Coordinate) []h.Coordinate {
var ret []h.Coordinate
for _, v := range []rune{
'e', 'n' + 'e', 's' + 'e', 'w', 'n' + 'w', 's' + 'w',
} {
ret = append(ret, GetNeighborCoord(c, v))
}
return ret
}
// Translate hex neighbors into a 2d plane
func GetNeighborCoord(c h.Coordinate, dir rune) h.Coordinate {
switch dir {
case 'e':
return c.East()
case 'n' + 'e':
return c.North()
case 's' + 'e':
return c.South().East()
case 'w':
return c.West()
case 'n' + 'w':
return c.North().West()
case 's' + 'w':
return c.South()
}
return c
}

20
2020/day24/testinput

@ -0,0 +1,20 @@
sesenwnenenewseeswwswswwnenewsewsw
neeenesenwnwwswnenewnwwsewnenwseswesw
seswneswswsenwwnwse
nwnwneseeswswnenewneswwnewseswneseene
swweswneswnenwsewnwneneseenw
eesenwseswswnenwswnwnwsewwnwsene
sewnenenenesenwsewnenwwwse
wenwwweseeeweswwwnwwe
wsweesenenewnwwnwsenewsenwwsesesenwne
neeswseenwwswnwswswnw
nenwswwsewswnenenewsenwsenwnesesenew
enewnwewneswsewnwswenweswnenwsenwsw
sweneswneswneneenwnewenewwneswswnese
swwesenesewenwneswnwwneseswwne
enesenwswwswneneswsenwnewswseenwsese
wnwnesenesenenwwnenwsewesewsesesew
nenewswnwewswnenesenwnesewesw
eneswnwswnwsenenwnwnwwseeswneewsenese
neswnwewnwnwseenwseesewsenwsweewe
wseweeenwnesenwwwswnew

8
helpers/coordinate.go

@ -18,16 +18,16 @@ func (c Coordinate) Relative(t Coordinate) Coordinate {
return Coordinate{X: c.X + t.X, Y: c.Y + t.Y}
}
func (c *Coordinate) North() Coordinate {
func (c Coordinate) North() Coordinate {
return Coordinate{X: c.X, Y: c.Y - 1}
}
func (c *Coordinate) East() Coordinate {
func (c Coordinate) East() Coordinate {
return Coordinate{X: c.X + 1, Y: c.Y}
}
func (c *Coordinate) South() Coordinate {
func (c Coordinate) South() Coordinate {
return Coordinate{X: c.X, Y: c.Y + 1}
}
func (c *Coordinate) West() Coordinate {
func (c Coordinate) West() Coordinate {
return Coordinate{X: c.X - 1, Y: c.Y}
}
func (c *Coordinate) NW() Coordinate {

14
helpers/helpers.go

@ -340,3 +340,17 @@ func IsPrime(value int) bool {
}
return value > 1
}
func Min(v1, v2 int) int {
if v1 < v2 {
return v1
}
return v2
}
func Max(v1, v2 int) int {
if v1 > v2 {
return v1
}
return v2
}
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