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day22.go
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package main
import (
"fmt"
"log"
"regexp"
"strconv"
"strings"
)
var re = regexp.MustCompile(`(\d+|R|L)`)
func main() {
fmt.Println(part1(input1))
fmt.Println(part1(input2))
fmt.Println(part2(input2))
}
type direction complex128
func (d direction) clockwise() direction {
d = d * -1i
return d
}
func (d direction) anticlockwise() direction {
d = d * 1i
return d
}
func (d direction) inv() complex128 {
return complex(real(d), -imag(d))
}
func (d direction) isUp() bool {
return imag(d) > 0
}
func (d direction) isDown() bool {
return imag(d) < 0
}
func (d direction) isLeft() bool {
return real(d) < 0
}
func (d direction) isRight() bool {
return real(d) > 0
}
func (d direction) complex() complex128 {
// NOTE: The imaginary number treats going down as -tive, but in our scenario
// going down is increasing y.
return complex(real(d), -imag(d))
}
func part1(input string) int {
grid, ins := parse(input)
boundary := grid.bound()
dir := direction(1 + 0i) // Facing right.
start := grid.topLeft()
for _, in := range ins {
switch in {
case "R":
//fmt.Println("turn cw")
dir = dir.clockwise()
case "L":
//fmt.Println("turn anti-cw")
dir = dir.anticlockwise()
default:
n := toInt(in)
for i := 0; i < n; i++ {
p := start + dir.complex()
if grid[p].valid() {
if grid[p].wall() {
break
}
start = p
continue
}
// Out of boundary.
switch {
case dir.isUp():
// Start from bottom.
p = complex(real(p), imag(boundary))
case dir.isDown():
// Start from top.
p = complex(real(p), 0)
case dir.isLeft():
p = complex(real(boundary), imag(p))
case dir.isRight():
p = complex(0, imag(p))
}
for !grid[p].valid() {
p += dir.complex()
}
if grid[p].wall() {
break
}
start = p
}
}
}
total := (imag(start) + 1) * 1_000 // Row
total += (real(start) + 1) * 4 // Column
if dir.isUp() {
total += 3
} else if dir.isDown() {
total += 1
} else if dir.isLeft() {
total += 2
} else if dir.isRight() {
total += 0
}
return int(total)
}
func part2(input string) int {
grid, ins := parse(input)
dir := direction(1 + 0i) // Facing right.
start := grid.topLeft()
fmt.Println("start", start)
// 0 1 2
//0 [1][2]
//1 [3]
//2 [4][5]
//3 [6]
face := func(p complex128) int {
x, y := int(real(p))/50, int(imag(p))/50
switch x {
case 0:
switch y {
case 2:
return 4
case 3:
return 6
}
case 1:
switch y {
case 0:
return 1
case 1:
return 3
case 2:
return 5
}
case 2:
if y == 0 {
return 2
}
}
log.Fatalf("invalid face at: %v", p)
return 0
}
for _, in := range ins {
switch in {
case "R":
dir = dir.clockwise()
case "L":
dir = dir.anticlockwise()
default:
n := toInt(in)
fmt.Println("walking steps", n)
for i := 0; i < n; i++ {
p := start + dir.complex()
if grid[p].valid() {
if grid[p].wall() {
break
}
start = p
continue
}
fmt.Println("current", start, dir, p, face(start), "grid", string(grid[start]))
/*
[1][2]
[3]
[4][5]
[6]
*/
// There are 14 edges that are not connected, we need to link them.
// 1U -> 6L, cw
// 6L -> 1U, an
// 1L -> 4L, cw, cw
// 4L -> 1L, cw, cw
// 2U -> 6D, no change
// 6D -> 2U, no change
// 2R -> 5R, cw, cw
// 5R -> 2R, cw, cw
// 2D -> 3R, cw
// 3R -> 2D, an
// 3L -> 4T, an
// 4T -> 3L, cw
// 5D -> 6R, cw
// 6R -> 5D, an
ndir := dir
x, y := real(start), imag(start)
switch face(start) {
case 1:
switch {
case dir.isLeft():
// 1L -> 4L, cw, cw
dir = dir.clockwise().clockwise()
p = complex(0, 149-y)
case dir.isUp():
// 1U -> 6L, cw
dir = dir.clockwise()
p = complex(0, x+100)
}
case 2:
switch {
case dir.isDown():
// 2D -> 3R, cw
dir = dir.clockwise()
p = complex(99, x-50)
case dir.isRight():
// 2R -> 5R, cw, cw
dir = dir.clockwise().clockwise()
p = complex(99, 149-y)
case dir.isUp():
// 2U -> 6D, no change
p = complex(x-100, 199)
}
case 3:
switch {
case dir.isLeft():
// 3L -> 4T, an
dir = dir.anticlockwise()
p = complex(y-50, 100)
case dir.isRight():
// 3R -> 2D, an
dir = dir.anticlockwise()
p = complex(y+50, 49)
}
case 4:
switch {
case dir.isLeft():
// 4L -> 1L, cw, cw
dir = dir.clockwise().clockwise()
p = complex(50, 149-y)
case dir.isUp():
// 4T -> 3L, cw
dir = dir.clockwise()
p = complex(50, x+50)
}
case 5:
switch {
case dir.isDown():
// 5D -> 6R, cw
dir = dir.clockwise()
p = complex(49, x+100)
case dir.isRight():
// 5R -> 2R, cw, cw
dir = dir.clockwise().clockwise()
p = complex(149, 149-y)
}
case 6:
switch {
case dir.isDown():
// 6D -> 2U, no change
p = complex(x+100, 0)
case dir.isLeft():
// 6L -> 1U, an
dir = dir.anticlockwise()
p = complex(y-100, 0)
case dir.isRight():
// 6R -> 5D, an
dir = dir.anticlockwise()
p = complex(y-100, 149)
}
}
if grid[p].wall() {
dir = ndir
break
}
start = p
}
}
}
total := (imag(start) + 1) * 1_000 // Row
total += (real(start) + 1) * 4 // Column
if dir.isUp() {
total += 3
} else if dir.isDown() {
total++
} else if dir.isLeft() {
total += 2
} else if dir.isRight() {
total += 0
}
return int(total)
}
func toInt(s string) int {
n, err := strconv.Atoi(s)
if err != nil {
panic(err)
}
return n
}
type tile rune
func (t tile) wall() bool { return t == '#' }
func (t tile) path() bool { return t == '.' }
func (t tile) valid() bool { return t.wall() || t.path() }
type grid map[complex128]tile
func (g grid) bound() complex128 {
var max complex128
for p := range g {
if real(p) > real(max) {
max = complex(real(p), imag(max))
}
if imag(p) > imag(max) {
max = complex(real(max), imag(p))
}
}
return max
}
func (g grid) topLeft() complex128 {
p := 0 + 0i
for !g[p].valid() {
p++
}
return p
}
func parse(input string) (grid, []string) {
parts := strings.Split(input, "\n\n")
m, ins := parts[0], parts[1]
grid := make(grid)
for y, row := range strings.Split(m, "\n") {
for x, t := range row {
p := complex(float64(x), float64(y))
switch t {
case '.', '#':
grid[p] = tile(t)
default:
}
}
}
return grid, re.FindAllString(ins, -1)
}
var input1 = ` ...#
.#..
#...
....
...#.......#
........#...
..#....#....
..........#.
...#....
.....#..
.#......
......#.
10R5L5R10L4R5L5`
var input2 = ` ............#..#..................#............#.......#..............#.............................
...#...#...#.......#............................#.#.....#..#...........................#......#.....
#.....#....#....#...............#..#.........#..................#......................#.##......#..
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