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2022 Day 23 Complete

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Brian Buller 2022-12-27 10:44:20 -06:00
parent 667c3a4dc9
commit cdc31b204b
17 changed files with 4631 additions and 1 deletions
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package main
import (
"fmt"
"strings"
h "git.bullercodeworks.com/brian/adventofcode/helpers"
)
var output []string
func main() {
inp := h.StdinToStringSlice()
part1(inp)
part2(inp)
}
func showLog() {
fmt.Println(h.CLEAR_SCREEN)
fmt.Println(strings.Join(output, "\n"))
}
func setLog(v ...string) {
output = []string{}
log(v...)
}
func log(v ...string) {
output = append(output, v...)
}
func loadMonkeys(inp []string) map[string]*Monkey {
monkeys := make(map[string]*Monkey)
for _, v := range inp {
if len(v) == 0 {
break
}
m := NewMonkey(strings.Split(v, ": ")...)
monkeys[m.name] = m
}
for _, v := range monkeys {
v.init(monkeys, 1)
}
return monkeys
}
func part1(inp []string) {
monkeys := loadMonkeys(inp)
log("# Part 1", fmt.Sprintf("%d", monkeys["root"].Value()))
showLog()
}
func part2(inp []string) {
fmt.Println()
monkeys := loadMonkeys(inp)
m1 := monkeys["root"].inp1 // <- Human is in here
m2 := monkeys["root"].inp2 // <- We need to make it match this
monkeys["humn"].Value = func() int { return 0 }
fmt.Println(m1.Value(), m2.Value())
monkeys["humn"].Value = func() int { return 1000 }
fmt.Println(m1.Value(), m2.Value())
//v := monkeys["root"].Value()
/*
i := 0
var lastV int
for {
monkeys["humn"].Value = func() int {
return i
}
v := monkeys["root"].Value()
if v == 0 {
output = append(output[:1], []string{"# Part 2", fmt.Sprintf("Found: %d", i)}...)
showLog()
return
}
output = append(output[:3], []string{
"# Part 2",
fmt.Sprintf("Scanning... [ humn: %d ]", i),
fmt.Sprintf("CURR: %d =? 0", v),
fmt.Sprintf("LAST: %d", lastV),
}...)
setLog(output...)
showLog()
}
*/
}
type Operation int
const (
opAdd = iota
opSub
opMlt
opDiv
)
type Monkey struct {
name string
op Operation
inp1, inp2 *Monkey
rawValue string
Value func() int
}
func NewMonkey(inp ...string) *Monkey { return &Monkey{name: inp[0], rawValue: inp[1]} }
func (m *Monkey) init(monkeys map[string]*Monkey, part int) {
pts := strings.Fields(m.rawValue)
if len(pts) == 1 {
m.Value = func() int { return h.Atoi(pts[0]) }
} else {
if part == 2 && m.name == "root" {
pts[1] = "-"
}
m.inp1, m.inp2 = monkeys[pts[0]], monkeys[pts[2]]
switch pts[1] {
case "+":
m.Value = func() int {
return m.inp1.Value() + m.inp2.Value()
}
case "-":
m.Value = func() int {
return m.inp1.Value() - m.inp2.Value()
}
case "*":
m.Value = func() int {
return m.inp1.Value() * m.inp2.Value()
}
case "/":
m.Value = func() int {
return m.inp1.Value() / m.inp2.Value()
}
case "=":
m.Value = func() int {
if m.inp1.Value() == m.inp2.Value() {
return 1
} else {
return 0
}
}
}
}
}

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Advent of Code
• [About]
• [Events]
• [Shop]
• [Settings]
• [Log Out]
br0xen (AoC++) 35*
      /*2022*/
• [Calendar]
• [AoC++]
• [Sponsors]
• [Leaderboard]
• [Stats]
Our sponsors help make Advent of Code possible:
Teradyne - Do you like coding algorithms where milliseconds matter? What about nanoseconds?
--- Day 21: Monkey Math ---
The monkeys are back! You're worried they're going to try to steal your stuff again, but it seems like they're just
holding their ground and making various monkey noises at you.
Eventually, one of the elephants realizes you don't speak monkey and comes over to interpret. As it turns out, they
overheard you talking about trying to find the grove; they can show you a shortcut if you answer their riddle.
Each monkey is given a job: either to yell a specific number or to yell the result of a math operation. All of the
number-yelling monkeys know their number from the start; however, the math operation monkeys need to wait for two other
monkeys to yell a number, and those two other monkeys might also be waiting on other monkeys.
Your job is to work out the number the monkey named root will yell before the monkeys figure it out themselves.
For example:
root: pppw + sjmn
dbpl: 5
cczh: sllz + lgvd
zczc: 2
ptdq: humn - dvpt
dvpt: 3
lfqf: 4
humn: 5
ljgn: 2
sjmn: drzm * dbpl
sllz: 4
pppw: cczh / lfqf
lgvd: ljgn * ptdq
drzm: hmdt - zczc
hmdt: 32
Each line contains the name of a monkey, a colon, and then the job of that monkey:
• A lone number means the monkey's job is simply to yell that number.
• A job like aaaa + bbbb means the monkey waits for monkeys aaaa and bbbb to yell each of their numbers; the monkey
then yells the sum of those two numbers.
• aaaa - bbbb means the monkey yells aaaa's number minus bbbb's number.
• Job aaaa * bbbb will yell aaaa's number multiplied by bbbb's number.
• Job aaaa / bbbb will yell aaaa's number divided by bbbb's number.
So, in the above example, monkey drzm has to wait for monkeys hmdt and zczc to yell their numbers. Fortunately, both
hmdt and zczc have jobs that involve simply yelling a single number, so they do this immediately: 32 and 2. Monkey drzm
can then yell its number by finding 32 minus 2: 30.
Then, monkey sjmn has one of its numbers (30, from monkey drzm), and already has its other number, 5, from dbpl. This
allows it to yell its own number by finding 30 multiplied by 5: 150.
This process continues until root yells a number: 152.
However, your actual situation involves considerably more monkeys. What number will the monkey named root yell?
To begin, get your puzzle input.
Answer: _____________________ [ [Submit] ]
You can also [Shareon Twitter Mastodon] this puzzle.
References
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. https://adventofcode.com/2022/about
. https://adventofcode.com/2022/events
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. https://adventofcode.com/2022/settings
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. Advent of Code Supporter
https://adventofcode.com/2022/support
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. https://adventofcode.com/2022/sponsors
. https://jobs.teradyne.com/?utm_source=adventofcode&utm_medium=ad&utm_campaign=2022
. https://adventofcode.com/2022/day/11
. https://adventofcode.com/2022/day/21/input
. https://twitter.com/intent/tweet?text=%22Monkey+Math%22+%2D+Day+21+%2D+Advent+of+Code+2022&url=https%3A%2F%2Fadventofcode%2Ecom%2F2022%2Fday%2F21&related=ericwastl&hashtags=AdventOfCode
. javascript:void(0);

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root: pppw + sjmn
dbpl: 5
cczh: sllz + lgvd
zczc: 2
ptdq: humn - dvpt
dvpt: 3
lfqf: 4
humn: 5
ljgn: 2
sjmn: drzm * dbpl
sllz: 4
pppw: cczh / lfqf
lgvd: ljgn * ptdq
drzm: hmdt - zczc
hmdt: 32

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package main
import (
"fmt"
"math"
h "git.bullercodeworks.com/brian/adventofcode/helpers"
)
func main() {
inp := h.StdinToStringSlice()
//part1(inp)
part2(inp)
}
func part1(inp []string) {
board, inst := inp[:len(inp)-2], inp[len(inp)-1]
b := BuildBoard(board)
var count int
var turn byte
fmt.Println(b)
fmt.Println(b.pos)
for len(inst) > 0 {
count, turn, inst = getNextInstructions(inst)
b.Move(count)
if turn == 'L' || turn == 'R' {
b.Turn(turn)
}
}
fmt.Println("Password:", b.Password())
}
func part2(inp []string) {
board, inst := inp[:len(inp)-2], inp[len(inp)-1]
b := BuildCubeBoard(board)
var count int
var turn byte
fmt.Println(b)
fmt.Println(b.pos)
for len(inst) > 0 {
count, turn, inst = getNextInstructions(inst)
b.Move(count)
if turn == 'L' || turn == 'R' {
b.Turn(turn)
}
}
fmt.Println("Password:", b.Password())
}
func getNextInstructions(inst string) (int, byte, string) {
for i := range inst {
if inst[i] == 'L' || inst[i] == 'R' {
return h.Atoi(inst[:i]), inst[i], inst[i+1:]
}
}
return h.Atoi(inst), 0, ""
}
const (
dirR = iota
dirD
dirL
dirU
dirErr
sideTop = iota
sideBottom
sideRight
sideLeft
sideFront
sideBack
)
type CubeBoard struct {
Top *CubeBoardSide
Bottom *CubeBoardSide
Left *CubeBoardSide
Right *CubeBoardSide
Front *CubeBoardSide
Back *CubeBoardSide
// Pos now holds:
// y, x, dir, side
pos []int
}
// For the purposes of directions, we treat the board like this:
// [T]
// [B][L][F][R]
// [B]
// So up from left, front, back, and right are all top
// Up from bottom is front
// Down from bottom is back
// Up from top is back
// Down from top is front
// So you can continually go left on the main level and circumnavigate the cube
// Continually going up from anywhere will eventually get you bouncing between top and back
// Continually going down from anywhere will eventually get you bouncing between bottom and back
func BuildCubeBoard(inp []string) *CubeBoard {
cb := CubeBoard{}
var side string
for i := 0; i < len(inp); i++ {
if len(inp) == 0 {
break
}
side = inp[i]
i++
cbs := BuildCubeBoardSide(inp[i : i+len(inp[i])])
switch side {
case "Top":
cb.Top = cbs
case "Bottom":
cb.Bottom = cbs
case "Left":
cb.Left = cbs
case "Right":
cb.Right = cbs
case "Front":
cb.Front = cbs
case "Back":
cb.Back = cbs
}
i = i + cbs.Size() - 1
}
cb.pos = []int{0, 0, dirR, sideTop}
return &cb
}
func (cb *CubeBoard) Size() int { return cb.Top.Size() }
func (cb *CubeBoard) Move(count int) {
}
func (cb *CubeBoard) GetPosUp() []int {
y := cb.pos[0]
x := cb.pos[1]
dir := cb.pos[2]
side := cb.pos[3]
if y == 0 {
// Going to another side
switch side {
case sideTop:
side = sideBack
case sideBottom:
side = sideFront
case sideFront:
side = sideTop
case sideBack:
side = sideTop
case sideLeft:
side = sideTop
case sideRight:
side = sideTop
}
}
return []int{y, x, dir, side}
}
func (cb *CubeBoard) GetPosDown() []int {
y := cb.pos[0]
x := cb.pos[1]
dir := cb.pos[2]
side := cb.pos[3]
if y == cb.Size()-1 {
// Going to another side
switch side {
case sideTop:
side = sideFront
case sideBottom:
side = sideBack
case sideFront:
side = sideBottom
case sideBack:
side = sideBottom
case sideLeft:
side = sideBottom
case sideRight:
side = sideBottom
}
} else {
y = y + 1
}
return []int{y, x, dir, side}
}
func (cb *CubeBoard) GetPosRight() []int {
y := cb.pos[0]
x := cb.pos[1]
dir := cb.pos[2]
side := cb.pos[3]
if x == cb.Size()-1 {
// Going to another side
switch side {
case sideTop:
side = sideRight
case sideBottom:
side = sideRight
case sideFront:
side = sideRight
case sideBack:
side = sideLeft
case sideLeft:
side = sideFront
case sideRight:
side = sideBack
}
} else {
y = y + 1
}
return []int{y, x, dir, side}
}
// Get the current pos' side
func (cb *CubeBoard) Side() *CubeBoardSide {
switch cb.pos[3] {
case sideTop:
return cb.Top
case sideBottom:
return cb.Bottom
case sideFront:
return cb.Front
case sideBack:
return cb.Back
case sideLeft:
return cb.Left
case sideRight:
return cb.Right
}
return nil
}
func (cb *CubeBoard) Turn(dir byte) {
if dir == 'R' {
cb.pos[2] = (cb.pos[2] + 1) % dirErr
} else if dir == 'L' {
cb.pos[2] = (cb.pos[2] - 1 + dirErr) % dirErr
}
}
func (cb *CubeBoard) Tile(y, x, side int) byte {
switch side {
case sideTop:
return cb.Top.Tile(y, x)
case sideBottom:
return cb.Bottom.Tile(y, x)
case sideLeft:
return cb.Left.Tile(y, x)
case sideRight:
return cb.Right.Tile(y, x)
case sideFront:
return cb.Front.Tile(y, x)
case sideBack:
return cb.Back.Tile(y, x)
}
return 0
}
func (cb *CubeBoard) Password() int {
return 0
}
type CubeBoardSide struct {
spots [][]byte
}
func BuildCubeBoardSide(inp []string) *CubeBoardSide {
cbs := CubeBoardSide{}
fmt.Println("Building CBS from:", inp)
cbs.spots = make([][]byte, len(inp))
for y := range inp {
row := make([]byte, len(inp[y]))
for x := range inp[y] {
row[x] = inp[y][x]
}
cbs.spots[y] = row
}
return &cbs
}
func (cbs *CubeBoardSide) Size() int {
return len(cbs.spots)
}
func (cbs *CubeBoardSide) Tile(y, x int) byte {
if len(cbs.spots) < y && len(cbs.spots[y]) < x {
return cbs.spots[y][x]
}
return 0
}
type Board struct {
spots [][]byte
// pos holds
// y, x, dir
pos []int
}
func BuildBoard(inp []string) *Board {
maxX := math.MinInt
for y := range inp {
maxX = h.Max(maxX, len(inp[y]))
}
b := Board{
spots: make([][]byte, len(inp)),
}
for y := range inp {
sl := make([]byte, maxX)
for x := range inp[y] {
sl[x] = inp[y][x]
}
b.spots[y] = sl
}
b.pos = make([]int, 3)
for x := range b.spots[0] {
if b.spots[0][x] == '.' {
b.pos = []int{0, x, dirR}
break
}
}
return &b
}
func (b *Board) Password() int {
return ((b.pos[0] + 1) * 1000) + ((b.pos[1] + 1) * 4) + b.pos[2]
}
func (b *Board) Tile(y, x int) byte {
if len(b.spots) > y && len(b.spots[y]) > x {
return b.spots[y][x]
}
return 0
}
func (b *Board) GetNextPos() []int {
switch b.pos[2] {
case dirU:
return b.GetPosUp()
case dirR:
return b.GetPosRight()
case dirD:
return b.GetPosDown()
case dirL:
return b.GetPosLeft()
}
return []int{-1, -1}
}
func (b *Board) GetPosUp() []int {
x := b.pos[1]
y := ((b.pos[0] - 1) + len(b.spots)) % len(b.spots)
for (b.spots[y][x] == 0 || b.spots[y][x] == 32) && y != b.pos[0] {
y = ((y - 1) + len(b.spots)) % len(b.spots)
}
return []int{y, x}
}
func (b *Board) GetPosRight() []int {
y := b.pos[0]
x := (b.pos[1] + 1) % len(b.spots[y])
for (b.spots[y][x] == 0 || b.spots[y][x] == 32) && x != b.pos[1] {
x = (x + 1) % len(b.spots[y])
}
return []int{y, x}
}
func (b *Board) GetPosDown() []int {
x := b.pos[1]
y := (b.pos[0] + 1) % len(b.spots)
for (b.spots[y][x] == 0 || b.spots[y][x] == 32) && y != b.pos[0] {
y = (y + 1) % len(b.spots)
}
return []int{y, x}
}
func (b *Board) GetPosLeft() []int {
y := b.pos[0]
x := ((b.pos[1] - 1) + len(b.spots[y])) % len(b.spots[y])
for (b.spots[y][x] == 0 || b.spots[y][x] == 32) && x != b.pos[1] {
x = ((x - 1) + len(b.spots[y])) % len(b.spots[y])
}
return []int{y, x}
}
func (b *Board) Move(count int) {
var to []int
for count > 0 {
switch b.pos[2] {
case dirU:
to = b.GetPosUp()
case dirR:
to = b.GetPosRight()
case dirD:
to = b.GetPosDown()
case dirL:
to = b.GetPosLeft()
}
if b.Tile(to[0], to[1]) == '.' {
count--
b.pos[0], b.pos[1] = to[0], to[1]
} else {
break
}
}
}
func (b *Board) Turn(dir byte) {
if dir == 'R' {
b.pos[2] = (b.pos[2] + 1) % dirErr
} else if dir == 'L' {
b.pos[2] = (b.pos[2] - 1 + dirErr) % dirErr
}
}
func (b Board) String() string {
var ret string
for y := range b.spots {
for x := range b.spots[y] {
bt := b.spots[y][x]
if b.pos[1] == x && b.pos[0] == y {
switch b.pos[2] {
case dirU:
bt = '^'
case dirR:
bt = '>'
case dirD:
bt = 'v'
case dirL:
bt = '<'
default:
bt = '!'
}
}
ret = ret + fmt.Sprint(string(bt))
}
ret = ret + "\n"
}
return ret
}

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Advent of Code
• [About]
• [Events]
• [Shop]
• [Settings]
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br0xen (AoC++) 36*
   var y=2022;
• [Calendar]
• [AoC++]
• [Sponsors]
• [Leaderboard]
• [Stats]
Our sponsors help make Advent of Code possible:
Infi - De kerstman wil weer cadeaus bezorgen maar komt tot de ontdekking dat zijn
Kerstman Positioning System (KPS) niet meer werkt. Kan jij hem helpen?
--- Day 22: Monkey Map ---
The monkeys take you on a surprisingly easy trail through the jungle. They're even
going in roughly the right direction according to your handheld device's Grove
Positioning System.
As you walk, the monkeys explain that the grove is protected by a force field. To pass
through the force field, you have to enter a password; doing so involves tracing a
specific path on a strangely-shaped board.
At least, you're pretty sure that's what you have to do; the elephants aren't exactly
fluent in monkey.
The monkeys give you notes that they took when they last saw the password entered
(your puzzle input).
For example:
...#
.#..
#...
....
...#.......#
........#...
..#....#....
..........#.
...#....
.....#..
.#......
......#.
10R5L5R10L4R5L5
The first half of the monkeys' notes is a map of the board. It is comprised of a set
of open tiles (on which you can move, drawn .) and solid walls (tiles which you cannot
enter, drawn #).
The second half is a description of the path you must follow. It consists of
alternating numbers and letters:
• A number indicates the number of tiles to move in the direction you are facing. If
you run into a wall, you stop moving forward and continue with the next
instruction.
• A letter indicates whether to turn 90 degrees clockwise (R) or counterclockwise
(L). Turning happens in-place; it does not change your current tile.
So, a path like 10R5 means "go forward 10 tiles, then turn clockwise 90 degrees, then
go forward 5 tiles".
You begin the path in the leftmost open tile of the top row of tiles. Initially, you
are facing to the right (from the perspective of how the map is drawn).
If a movement instruction would take you off of the map, you wrap around to the other
side of the board. In other words, if your next tile is off of the board, you should
instead look in the direction opposite of your current facing as far as you can until
you find the opposite edge of the board, then reappear there.
For example, if you are at A and facing to the right, the tile in front of you is
marked B; if you are at C and facing down, the tile in front of you is marked D:
...#
.#..
#...
....
...#.D.....#
........#...
B.#....#...A
.....C....#.
...#....
.....#..
.#......
......#.
It is possible for the next tile (after wrapping around) to be a wall; this still
counts as there being a wall in front of you, and so movement stops before you
actually wrap to the other side of the board.
By drawing the last facing you had with an arrow on each tile you visit, the full path
taken by the above example looks like this:
>>v#
.#v.
#.v.
..v.
...#...v..v#
>>>v...>#.>>
..#v...#....
...>>>>v..#.
...#....
.....#..
.#......
......#.
To finish providing the password to this strange input device, you need to determine
numbers for your final row, column, and facing as your final position appears from the
perspective of the original map. Rows start from 1 at the top and count downward;
columns start from 1 at the left and count rightward. (In the above example, row 1,
column 1 refers to the empty space with no tile on it in the top-left corner.) Facing
is 0 for right (>), 1 for down (v), 2 for left (<), and 3 for up (^). The final
password is the sum of 1000 times the row, 4 times the column, and the facing.
In the above example, the final row is 6, the final column is 8, and the final facing
is 0. So, the final password is 1000 * 6 + 4 * 8 + 0: 6032.
Follow the path given in the monkeys' notes. What is the final password?
To begin, get your puzzle input.
Answer: _____________________ [ [Submit] ]
You can also [Shareon Twitter Mastodon] this puzzle.
References
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. Advent of Code Supporter
https://adventofcode.com/2022/support
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. https://aoc.infi.nl/?mtm_campaign=aoc2022&mtm_source=aoc
. https://adventofcode.com/2022/day/22/input
. https://twitter.com/intent/tweet?text=%22Monkey+Map%22+%2D+Day+22+%2D+Advent+of+Code+2022&url=https%3A%2F%2Fadventofcode%2Ecom%2F2022%2Fday%2F22&related=ericwastl&hashtags=AdventOfCode
. javascript:void(0);

14
2022/day22/testinput Normal file
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...#
.#..
#...
....
...#.......#
........#...
..#....#....
..........#.
...#....
.....#..
.#......
......#.
10R5L5R10L4R5L5

32
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Top
...#
.#..
#...
....
Back
...#
....
..#.
....
Left
....
....
...#
....
Front
...#
#...
....
..#.
Bottom
...#
....
.#..
....
Right
....
.#..
....
..#.
10R5L5R10L4R5L5

73
2022/day23/input Normal file
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.#.###...###....##..####.#.###.####.#..##......#.####.###.###...#.####.##
.#...#.####.##.#.#.#####.#.#.....#...#.####.#..#.###.###....##.#.###.#...
.....#..#........###.##.......###..#.....#####......###.#.#.####..#...#.#
.##.##.#.####....###.#..###..#########..##....#..##..#.##.#....#.#.##.#.#
..#..##...#.#..##.#...###.#.#..#...#....####.##.##...#.###.###...##..#.#.
###.###....#.##.#...#.##.##.##..###.#.#..##...###.###...###.#.#..#.######
.#.#####..#.####.###..##.#.#.#.#.#.#...##.####.#..#.#####.#..#....#.#..#.
..######.##.#.##.###..#.#.#.#.##..###.######..#.......######.#.##.##..#.#
#####......#.......######.#####.###..###......#..#..###.....#.#####......
##...#.#..###.#######.###.##########...#...#.##.#..#..##.#...#.##....##..
####.#...######....##..#.###.#...#.#.#..########...#..#######.####.#.#.##
#....###..#.##..###.....#.#####...#.##....###..##.#..##..#....###......#.
##.#..#.##.#.####...#.....##.##.#.#.######.#.###.....##..#......#..##.#..
.......#.#####.#..#.##.#....##..#.##.#..#..#.###.#.##...#..#.##.#..#.....
#.#..#...#..####.#.#.###..###..#######.#...#....##..###...#...##.###.###.
#.#..#..#...##..#.#...#..#.#.#..#.#..#####......##..##.#...#.#.###....##.
#..#...##.#.#.#....##......##...#.###.#..#..#...#.###.####.#.##..##....#.
###.#..#.#.##..#.##......#...####.....##...#.#......##..######.#.#..#..#.
.......#.######...##..#....#.#...##......#.....#..###.######.#...#.####.#
...##.....#....#.##.##.########.#..#....#####.######....##.###...#.#.##..
##...##..#...#.#..#..#.#.##.###.########..##...#..##....##..##..#####..##
##..#####..#.####..##...#.##..##.##..#....####..####..#.########.#######.
.#.#.######..#.##.###.#.#...#.#...###..#.##.#####.##.####.#...####.##.###
##.#..#.#####.#....#..##...##..##.###..#.#....#.##....###.....#..##.##..#
##.##.#..##.###.#.##.#..###...##.##...##.###...####.###...#.####.#.....#.
.#.##..#####..#..#.....#####.#.#.###.#.#.####.##....##..#..##.####.###...
.#...#.#.######.#....##.##.#.##...#..#.##....##...#.##.....###.#......###
##....###.##.###.##.###..##...####..#..#####..##..........##.....#.#.#..#
..#####.##.#...#......#..###..#...##..#.###....##.##.##.####.#.##.###..##
##.##..#####..####..#..##.#....##...#..####..######...##..##.#.###.#.##.#
.#.#..#...######.###..##.#......##.##..#.##.##..#.##.#.#.###.##..###....#
..###.#...#......#.#.#........#.#######..#.#.######..##.#...###.##.#....#
#..####.....#.#.#.#.###...#..##.#.#.##.#.#...###.#.#.#.#####..#.##.###..#
##...####.....#....#.####.#....#...####.########..#....######.#..##..#.##
.#.#.##...########.#######.......##......###..#....########..#......#..##
.##......#..#######..#....#..##.#.####..##.#.#..##..##..#######..###.#.#.
..##.######...##..#.#.##...##.###.##.##....##.#...#..#..#..###.####......
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.#..#........#..#..#.#..####.#.#....#.#.#.#...##...####..##.##.##.#.##.#.
##...#.#.#.###...#....###..####.##..##.##..#.#####.##....#..##.########.#
.#.#..##.#.####..#..#...#.######...###.#.#####.###.##.##..............##.
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##.#...###.#.#.###.#...#....#.#.....#.#..#.#..###.##.#...##..#####.#..#..
.###....#######.##.#..#####.#.#.##.#..###.#.#.###.#.#.###...#.##.....###.
##.#.#.#...#...#.#...#.....##..###..#......#.#.###.#.#.##.##..####.####..
#.###.#####.#####....#..###..####.###.#####..##.....#.#####.###...#..#.#.
.#..#..#..##..####.######...#...#.#.#.#....#.#......###...###.....#..###.
#..####.##.#.#..##..#####.###..#.######.##..####.........##.....##..#.#..
#..#.#..##.#.#..##..##.#.#.#.#..#.#....#.#.###.#.#.##.#.#.#..###..#...###
##....###.##..#..##.##.#.##.#.....#...###.######....#.##.##.#..##.##...##
.#..#....#...#.###..########.#...#..#.#.###.#.###...#..#.#..##.###.##..##
#.#.##.##.#...######.#...#...###.###.##...###.#..#.##...#.###.###.##.#.##
.....#..##..##.####..##..#.###.#######.#...##..#...#####..##...####......
#.#####..##...#.##...#.#...##....######.#.#####...#.....#.#..#.#...#..#..
#####.####.####.#..#.####..##..###.######..##.###..####.#...#.#.###....#.
###..#.##.#######.#.#.#.#......###.#.##..##.##.##..#.#....#..####......#.
.....#..#..#..###...#.###..####.#...###...######.#.##....###.##..#..#..#.
#.#..##..##.##...#.###.#.###.#####.#.#.####.###.##.####..##.###..#.#####.
.###....#...#.##.####.#.....####..#.##..##..##.##.#.##.##..###.###.#..#..
..#.###.....#...##..###.##....###..####.#.##.###.####.##.#.##.#...#.#####
.##.#..#....#..##.###..#..#.#..####.##.#...#.......###.#...#.##......#.#.
......###.##########..###.##..#...#....#....#.####....##.#.#.##.##......#
#.#.####..#.#..##..##......##..#####..##.#.#.###........#.#..#.#####.#.#.
#...###..#...##..#.#.##..#.#..#..#.##..#.#...#####..#.#.###.##.#..##.#.#.
..#.###.###..###..#.#.#.##.###.#####......#.###...##.#.##.###.##.##.#####
....###..##.#.##....#..###.#.##.###.#....#.##...#...####.#.#..##..##.#.#.
#..#.###.###.######.#.##.#..#.#.#...#..#........##..#...##.###.#.##.#...#
####...###...#.###.#..#.#.#..#.#..##....#.##.#..#.##.#..#.###.#.##.####..
.#####....##.#..##.....##.#..#......#..##..#.....#..#.###.#.#.###...###.#
.#........#.....###.####..##....##.##....####.##.#####...##..#........#..
...#####.#.####.#.#....#..##.#..#.#.##....###....#..#..#...##.#.##.##...#
#...##..#.####.####.##.##.###.##....#...#.####..##.#.......#..#.###..#..#
.##...#####..####..#.###.##..##.#.#...#....#.#..####..##...#.....#.##.##.

201
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package main
import (
"fmt"
"math"
"sort"
h "git.bullercodeworks.com/brian/adventofcode/helpers"
)
func main() {
inp := h.StdinToStringSlice()
part1(inp)
part2(inp)
}
func part1(inp []string) {
field := plotElves(inp)
for i := 0; i < 10; i++ {
proposals := buildProposals(field, i)
for k, v := range proposals {
delete(field, v)
field[k] = true
}
}
fmt.Println("# Part 1")
fmt.Println("Empty Tiles:", countEmpties(field))
}
func part2(inp []string) {
field := plotElves(inp)
var lastHash string
for i := 0; i < 100000000; i++ {
proposals := buildProposals(field, i)
for k, v := range proposals {
delete(field, v)
field[k] = true
}
currHash := fieldHash(field)
if currHash == lastHash {
fmt.Println("# Part 2")
fmt.Println("Stable on round", i+1)
return
}
lastHash = currHash
}
fmt.Println("# Part 2")
fmt.Println("No solution found.")
}
func fieldHash(field map[h.Coordinate]bool) string {
var sorted []h.Coordinate
for k := range field {
sorted = append(sorted, k)
}
sort.Slice(sorted, func(i, j int) bool {
if sorted[i].X == sorted[j].X {
return sorted[i].Y > sorted[j].Y
}
return sorted[i].X > sorted[j].X
})
return fmt.Sprintf("%v", sorted)
}
func countEmpties(field map[h.Coordinate]bool) int {
maxX, minX := math.MinInt, math.MaxInt
maxY, minY := math.MinInt, math.MaxInt
for k := range field {
maxX = h.Max(maxX, k.X)
minX = h.Min(minX, k.X)
maxY = h.Max(maxY, k.Y)
minY = h.Min(minY, k.Y)
}
var ret int
for y := minY; y <= maxY; y++ {
for x := minX; x <= maxX; x++ {
if _, ok := field[h.Coordinate{X: x, Y: y}]; !ok {
ret++
}
}
}
return ret
}
func printField(field map[h.Coordinate]bool) {
maxX, minX := math.MinInt, 0
maxY, minY := math.MinInt, 0
for k := range field {
maxX = h.Max(maxX, k.X)
minX = h.Min(minX, k.X)
maxY = h.Max(maxY, k.Y)
minY = h.Min(minY, k.Y)
}
maxX = maxX + 2
maxY = maxY + 2
for y := minY; y <= maxY; y++ {
for x := minX; x <= maxX; x++ {
if _, ok := field[h.Coordinate{X: x, Y: y}]; ok {
fmt.Print("#")
} else {
fmt.Print(".")
}
}
fmt.Println()
}
}
func plotElves(inp []string) map[h.Coordinate]bool {
field := make(map[h.Coordinate]bool)
for y := range inp {
for x := range inp[y] {
if inp[y][x] == '#' {
field[h.Coordinate{X: x, Y: y}] = true
}
}
}
return field
}
func buildProposals(field map[h.Coordinate]bool, round int) map[h.Coordinate]h.Coordinate {
props := make(map[h.Coordinate]h.Coordinate)
var errProps []h.Coordinate
for k := range field {
var neighbors []h.Coordinate
for _, n := range k.GetAllNeighbors() {
if _, ok := field[n]; ok {
neighbors = append(neighbors, n)
}
}
if len(neighbors) == 0 {
continue
}
var hasNorth, hasEast, hasSouth, hasWest bool
for _, n := range neighbors {
if n.Y < k.Y {
hasNorth = true
}
if n.Y > k.Y {
hasSouth = true
}
if n.X < k.X {
hasWest = true
}
if n.X > k.X {
hasEast = true
}
}
addProp := func(c h.Coordinate) {
if _, ok := props[c]; ok {
errProps = append(errProps, c)
} else {
props[c] = k
}
}
testNorth := func(c h.Coordinate) bool {
if !hasNorth {
addProp(k.North())
return true
}
return false
}
testSouth := func(c h.Coordinate) bool {
if !hasSouth {
addProp(k.South())
return true
}
return false
}
testWest := func(c h.Coordinate) bool {
if !hasWest {
addProp(k.West())
return true
}
return false
}
testEast := func(c h.Coordinate) bool {
if !hasEast {
addProp(k.East())
return true
}
return false
}
findProposal := func(c h.Coordinate, tests ...func(h.Coordinate) bool) {
for i := range tests {
if tests[i](c) == true {
return
}
}
}
switch round % 4 {
case 0: // North First
findProposal(k, testNorth, testSouth, testWest, testEast)
case 1: // South First
findProposal(k, testSouth, testWest, testEast, testNorth)
case 2: // West First
findProposal(k, testWest, testEast, testNorth, testSouth)
case 3: // East First
findProposal(k, testEast, testNorth, testSouth, testWest)
}
}
// Now remove all conflicts
for i := range errProps {
delete(props, errProps[i])
}
return props
}

299
2022/day23/problem Normal file
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@ -0,0 +1,299 @@
Advent of Code
br0xen (AoC++) 39*
--- Day 23: Unstable Diffusion ---
You enter a large crater of gray dirt where the grove is supposed to be. All around
you, plants you imagine were expected to be full of fruit are instead withered and
broken. A large group of Elves has formed in the middle of the grove.
"...but this volcano has been dormant for months. Without ash, the fruit can't grow!"
You look up to see a massive, snow-capped mountain towering above you.
"It's not like there are other active volcanoes here; we've looked everywhere."
"But our scanners show active magma flows; clearly it's going somewhere."
They finally notice you at the edge of the grove, your pack almost overflowing from
the random star fruit you've been collecting. Behind you, elephants and monkeys
explore the grove, looking concerned. Then, the Elves recognize the ash cloud slowly
spreading above your recent detour.
"Why do you--" "How is--" "Did you just--"
Before any of them can form a complete question, another Elf speaks up: "Okay, new
plan. We have almost enough fruit already, and ash from the plume should spread here
eventually. If we quickly plant new seedlings now, we can still make it to the
extraction point. Spread out!"
The Elves each reach into their pack and pull out a tiny plant. The plants rely on
important nutrients from the ash, so they can't be planted too close together.
There isn't enough time to let the Elves figure out where to plant the seedlings
themselves; you quickly scan the grove (your puzzle input) and note their positions.
For example:
....#..
..###.#
#...#.#
.#...##
#.###..
##.#.##
.#..#..
The scan shows Elves # and empty ground .; outside your scan, more empty ground
extends a long way in every direction. The scan is oriented so that north is up;
orthogonal directions are written N (north), S (south), W (west), and E (east), while
diagonal directions are written NE, NW, SE, SW.
The Elves follow a time-consuming process to figure out where they should each go; you
can speed up this process considerably. The process consists of some number of rounds
during which Elves alternate between considering where to move and actually moving.
During the first half of each round, each Elf considers the eight positions adjacent
to themself. If no other Elves are in one of those eight positions, the Elf does not
do anything during this round. Otherwise, the Elf looks in each of four directions in
the following order and proposes moving one step in the first valid direction:
• If there is no Elf in the N, NE, or NW adjacent positions, the Elf proposes moving
north one step.
• If there is no Elf in the S, SE, or SW adjacent positions, the Elf proposes moving
south one step.
• If there is no Elf in the W, NW, or SW adjacent positions, the Elf proposes moving
west one step.
• If there is no Elf in the E, NE, or SE adjacent positions, the Elf proposes moving
east one step.
After each Elf has had a chance to propose a move, the second half of the round can
begin. Simultaneously, each Elf moves to their proposed destination tile if they were
the only Elf to propose moving to that position. If two or more Elves propose moving
to the same position, none of those Elves move.
Finally, at the end of the round, the first direction the Elves considered is moved to
the end of the list of directions. For example, during the second round, the Elves
would try proposing a move to the south first, then west, then east, then north. On
the third round, the Elves would first consider west, then east, then north, then
south.
As a smaller example, consider just these five Elves:
.....
..##.
..#..
.....
..##.
.....
The northernmost two Elves and southernmost two Elves all propose moving north, while
the middle Elf cannot move north and proposes moving south. The middle Elf proposes
the same destination as the southwest Elf, so neither of them move, but the other
three do:
..##.
.....
..#..
...#.
..#..
.....
Next, the northernmost two Elves and the southernmost Elf all propose moving south. Of
the remaining middle two Elves, the west one cannot move south and proposes moving
west, while the east one cannot move south or west and proposes moving east. All five
Elves succeed in moving to their proposed positions:
.....
..##.
.#...
....#
.....
..#..
Finally, the southernmost two Elves choose not to move at all. Of the remaining three
Elves, the west one proposes moving west, the east one proposes moving east, and the
middle one proposes moving north; all three succeed in moving:
..#..
....#
#....
....#
.....
..#..
At this point, no Elves need to move, and so the process ends.
The larger example above proceeds as follows:
== Initial State ==
..............
..............
.......#......
.....###.#....
...#...#.#....
....#...##....
...#.###......
...##.#.##....
....#..#......
..............
..............
..............
== End of Round 1 ==
..............
.......#......
.....#...#....
...#..#.#.....
.......#..#...
....#.#.##....
..#..#.#......
..#.#.#.##....
..............
....#..#......
..............
..............
== End of Round 2 ==
..............
.......#......
....#.....#...
...#..#.#.....
.......#...#..
...#..#.#.....
.#...#.#.#....
..............
..#.#.#.##....
....#..#......
..............
..............
== End of Round 3 ==
..............
.......#......
.....#....#...
..#..#...#....
.......#...#..
...#..#.#.....
.#..#.....#...
.......##.....
..##.#....#...
...#..........
.......#......
..............
== End of Round 4 ==
..............
.......#......
......#....#..
..#...##......
...#.....#.#..
.........#....
.#...###..#...
..#......#....
....##....#...
....#.........
.......#......
..............
== End of Round 5 ==
.......#......
..............
..#..#.....#..
.........#....
......##...#..
.#.#.####.....
...........#..
....##..#.....
..#...........
..........#...
....#..#......
..............
After a few more rounds...
== End of Round 10 ==
.......#......
...........#..
..#.#..#......
......#.......
...#.....#..#.
.#......##....
.....##.......
..#........#..
....#.#..#....
..............
....#..#..#...
..............
To make sure they're on the right track, the Elves like to check after round 10 that
they're making good progress toward covering enough ground. To do this, count the
number of empty ground tiles contained by the smallest rectangle that contains every
Elf. (The edges of the rectangle should be aligned to the N/S/E/W directions; the
Elves do not have the patience to calculate arbitrary rectangles.) In the above
example, that rectangle is:
......#.....
..........#.
.#.#..#.....
.....#......
..#.....#..#
#......##...
....##......
.#........#.
...#.#..#...
............
...#..#..#..
In this region, the number of empty ground tiles is 110.
Simulate the Elves' process and find the smallest rectangle that contains the Elves
after 10 rounds. How many empty ground tiles does that rectangle contain?
Your puzzle answer was 4000.
--- Part Two ---
It seems you're on the right track. Finish simulating the process and figure out where
the Elves need to go. How many rounds did you save them?
In the example above, the first round where no Elf moved was round 20:
.......#......
....#......#..
..#.....#.....
......#.......
...#....#.#..#
#.............
....#.....#...
..#.....#.....
....#.#....#..
.........#....
....#......#..
.......#......
Figure out where the Elves need to go. What is the number of the first round where no
Elf moves?
Your puzzle answer was 1040.
Both parts of this puzzle are complete! They provide two gold stars: **
References
Visible links
. https://adventofcode.com/
. https://adventofcode.com/2022/about
. https://adventofcode.com/2022/events
. https://adventofcode.com/2022/settings
. https://adventofcode.com/2022/auth/logout
. Advent of Code Supporter
https://adventofcode.com/2022/support
. https://adventofcode.com/2022
. https://adventofcode.com/2022
. https://adventofcode.com/2022/support
. https://adventofcode.com/2022/sponsors
. https://adventofcode.com/2022/leaderboard
. https://adventofcode.com/2022/stats
. https://adventofcode.com/2022/sponsors
. https://adventofcode.com/2022
. https://adventofcode.com/2022/day/23/input

7
2022/day23/testinput Normal file
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@ -0,0 +1,7 @@
....#..
..###.#
#...#.#
.#...##
#.###..
##.#.##
.#..#..

6
2022/day23/testinput2 Normal file
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@ -0,0 +1,6 @@
.....
..##.
..#..
.....
..##.
.....

2
go.mod
View File

@ -1,6 +1,6 @@
module git.bullercodeworks.com/brian/adventofcode module git.bullercodeworks.com/brian/adventofcode
go 1.13 go 1.16
require ( require (
github.com/br0xen/termbox-screen v0.0.0-20190712162752-c91f70ac38c6 github.com/br0xen/termbox-screen v0.0.0-20190712162752-c91f70ac38c6

7
helpers/coordinate.go
View File

@ -66,6 +66,13 @@ func (c *Coordinate) SE() Coordinate {
func (c *Coordinate) GetOrthNeighbors() []Coordinate { func (c *Coordinate) GetOrthNeighbors() []Coordinate {
return []Coordinate{c.North(), c.East(), c.South(), c.West()} return []Coordinate{c.North(), c.East(), c.South(), c.West()}
} }
func (c *Coordinate) GetAllNeighbors() []Coordinate {
return []Coordinate{
c.North(), c.NE(),
c.East(), c.SE(),
c.South(), c.SW(),
c.West(), c.NW()}
}
func (c *Coordinate) GetNorthCoord() *Coordinate { func (c *Coordinate) GetNorthCoord() *Coordinate {
return &Coordinate{ return &Coordinate{