Day 17 solution
My initial idea for a solution ended up working out great, but I had a hard time getting it all down on "paper," so to speak, so this is probably 200 lines of code too many, but it definitely does exactly what I envisioned (and quickly) even if it's not the most succinct.
This commit is contained in:
422
days/17.go
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422
days/17.go
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package days
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import (
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"fmt"
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"strings"
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u "parnic.com/aoc2019/utilities"
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)
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type camViewCellType int
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type botFacing int
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type day17Grid [][]camViewCellType
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const (
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cellTypeScaffold camViewCellType = iota
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cellTypeOpen
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cellTypeInvalid
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)
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const (
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botFacingUp botFacing = iota
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botFacingLeft
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botFacingDown
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botFacingRight
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botFacingFirst = botFacingUp
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botFacingLast = botFacingRight
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)
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const (
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dirLeft = 1
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dirRight = -1
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maxInstructionSetLength = 20
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)
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var (
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day17AdjacentOffsets = []u.Vec2i{
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{X: -1, Y: 0},
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{X: 1, Y: 0},
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{X: 0, Y: -1},
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{X: 0, Y: 1},
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}
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)
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type Day17 struct {
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program u.IntcodeProgram
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}
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func (d *Day17) Parse() {
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d.program = u.LoadIntcodeProgram("17p")
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}
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func (d Day17) Num() int {
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return 17
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}
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func (currentDir botFacing) getNewFacingDir(turnDir int) botFacing {
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currentDir += botFacing(turnDir)
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if currentDir < botFacingFirst {
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currentDir = botFacingLast
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} else if currentDir > botFacingLast {
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currentDir = botFacingFirst
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}
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return currentDir
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}
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func (grid day17Grid) Draw(botLocation u.Vec2i, botFacingDir botFacing, endLocation u.Vec2i) {
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for y := range grid {
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for x := range grid[y] {
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switch grid[y][x] {
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case cellTypeOpen:
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fmt.Print(" ")
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case cellTypeScaffold:
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char := "█"
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color := u.ColorBlack
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if botLocation.X == x && botLocation.Y == y {
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switch botFacingDir {
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case botFacingUp:
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char = "^"
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case botFacingLeft:
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char = "<"
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case botFacingDown:
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char = "v"
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case botFacingRight:
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char = ">"
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}
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} else if endLocation.X == x && endLocation.Y == y {
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char = "@"
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} else {
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color = u.ColorWhite
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}
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fmt.Printf("%s%s%s%s", u.BackgroundWhite, color, char, u.TextReset)
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}
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}
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fmt.Println()
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}
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}
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func (grid day17Grid) getAdjacentScaffolds(y, x int) []u.Vec2i {
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retval := make([]u.Vec2i, 0)
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for _, offset := range day17AdjacentOffsets {
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offY := y + offset.Y
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offX := x + offset.X
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if offY < 0 || offY >= len(grid) ||
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offX < 0 || offX >= len(grid[0]) {
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continue
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}
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if grid[offY][offX] == cellTypeScaffold {
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retval = append(retval, u.Vec2i{X: offX, Y: offY})
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}
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}
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return retval
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}
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func (grid day17Grid) forEachCellOfType(t camViewCellType, f func(y, x int)) {
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for y := range grid {
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for x := range grid[y] {
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if grid[y][x] == t {
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f(y, x)
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}
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}
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}
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}
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func (grid *day17Grid) processGridUpdate(y int, rVal rune, currBotLocation u.Vec2i, currBotFacing botFacing) (int, u.Vec2i, botFacing) {
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grid.appendValue(rVal, y)
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switch rVal {
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case '\n':
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y++
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case '^', '<', 'v', '>':
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currBotLocation = u.Vec2i{X: len((*grid)[y]) - 1, Y: y}
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switch rVal {
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case '^':
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currBotFacing = botFacingUp
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case '<':
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currBotFacing = botFacingLeft
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case 'v':
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currBotFacing = botFacingDown
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case '>':
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currBotFacing = botFacingRight
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}
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}
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return y, currBotLocation, currBotFacing
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}
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func (grid day17Grid) getCellTypeInDirection(y, x int, facingDir botFacing) (camViewCellType, int, int) {
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newX := x
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newY := y
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switch facingDir {
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case botFacingUp:
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newY--
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case botFacingLeft:
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newX--
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case botFacingDown:
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newY++
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case botFacingRight:
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newX++
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}
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if newY < 0 || newY >= len(grid) || newX < 0 || newX >= len(grid[0]) {
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return cellTypeInvalid, newY, newX
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}
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return grid[newY][newX], newY, newX
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}
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func (grid *day17Grid) appendValue(rVal rune, row int) {
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ensureCapacity := func(y int) {
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for len(*grid) <= y {
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*grid = append(*grid, make([]camViewCellType, 0))
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}
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}
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switch rVal {
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case '#':
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ensureCapacity(row)
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(*grid)[row] = append((*grid)[row], cellTypeScaffold)
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case '.':
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ensureCapacity(row)
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(*grid)[row] = append((*grid)[row], cellTypeOpen)
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case '^', '<', 'v', '>':
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ensureCapacity(row)
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(*grid)[row] = append((*grid)[row], cellTypeScaffold)
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}
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}
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func (grid day17Grid) findEndLocation(botLocation u.Vec2i) u.Vec2i {
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var endLocation u.Vec2i
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grid.forEachCellOfType(cellTypeScaffold, func(y, x int) {
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if numSurrounding := len(grid.getAdjacentScaffolds(y, x)); numSurrounding == 1 {
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if botLocation.X != x || botLocation.Y != y {
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endLocation = u.Vec2i{X: x, Y: y}
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}
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}
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})
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return endLocation
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}
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func (grid day17Grid) getTurnDirectionFromCorner(pos u.Vec2i, botFacingDir botFacing) (int, string) {
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adj := grid.getAdjacentScaffolds(pos.Y, pos.X)
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turnDirection := 0
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// this is so awful. i'm sure there's a better way, but i'm tired.
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if botFacingDir == botFacingUp || botFacingDir == botFacingDown {
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if u.ArrayContains(adj, u.Vec2i{X: pos.X - 1, Y: pos.Y}) {
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if botFacingDir == botFacingUp {
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turnDirection = dirLeft
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} else if botFacingDir == botFacingDown {
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turnDirection = dirRight
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}
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} else if u.ArrayContains(adj, u.Vec2i{X: pos.X + 1, Y: pos.Y}) {
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if botFacingDir == botFacingUp {
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turnDirection = dirRight
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} else if botFacingDir == botFacingDown {
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turnDirection = dirLeft
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}
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}
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} else {
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if u.ArrayContains(adj, u.Vec2i{X: pos.X, Y: pos.Y - 1}) {
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if botFacingDir == botFacingLeft {
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turnDirection = dirRight
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} else if botFacingDir == botFacingRight {
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turnDirection = dirLeft
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}
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} else if u.ArrayContains(adj, u.Vec2i{X: pos.X, Y: pos.Y + 1}) {
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if botFacingDir == botFacingLeft {
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turnDirection = dirLeft
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} else if botFacingDir == botFacingRight {
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turnDirection = dirRight
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}
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}
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}
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dirAscii := "L"
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if turnDirection == dirRight {
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dirAscii = "R"
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}
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return turnDirection, dirAscii
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}
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func buildInstructionString(instructions []string) string {
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workingInstructions := make([]string, len(instructions))
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copy(workingInstructions, instructions)
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minimumRecurrence := 3
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initialInstructionSubsetLen := 4
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instructionStr := strings.Join(workingInstructions, ",")
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progs := make([][]string, 3)
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for i := range progs {
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numFound := minimumRecurrence
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subLen := initialInstructionSubsetLen
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for numFound >= minimumRecurrence {
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numFound = 1
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instructionSubset := strings.Join(workingInstructions[0:subLen], ",")
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if len(instructionSubset) > maxInstructionSetLength {
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break
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}
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for x := len(instructionSubset); x <= len(instructionStr)-len(instructionSubset); x++ {
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if instructionStr[x:x+len(instructionSubset)] == instructionSubset {
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numFound++
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x += len(instructionSubset)
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}
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}
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if numFound >= minimumRecurrence {
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subLen += 2
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}
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}
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if numFound < minimumRecurrence {
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subLen -= 2
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}
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progs[i] = make([]string, subLen)
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copy(progs[i], workingInstructions[0:subLen])
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instructionStr = strings.ReplaceAll(instructionStr, strings.Join(progs[i], ","), "")
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instructionStr = strings.TrimPrefix(strings.ReplaceAll(instructionStr, ",,", ","), ",")
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if len(instructionStr) == 0 {
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workingInstructions = nil
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} else {
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workingInstructions = strings.Split(instructionStr, ",")
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}
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}
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if workingInstructions != nil {
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panic("failed to use up all instructions")
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}
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programStr := strings.Join(instructions, ",")
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for i := range progs {
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programStr = strings.ReplaceAll(programStr, strings.Join(progs[i], ","), fmt.Sprintf("%c", 'A'+i))
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}
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sb := strings.Builder{}
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sb.WriteString(programStr)
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sb.WriteRune('\n')
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for i := range progs {
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sb.WriteString(strings.Join(progs[i], ","))
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sb.WriteRune('\n')
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}
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runDebug := 'n'
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sb.WriteRune(runDebug)
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sb.WriteRune('\n')
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return sb.String()
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}
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func (grid day17Grid) solvePath(botLocation u.Vec2i, botFacingDir botFacing) string {
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instructions := make([]string, 0)
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pos := botLocation
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endLocation := grid.findEndLocation(botLocation)
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for {
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if pos == endLocation {
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break
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}
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turnDirection, dirAscii := grid.getTurnDirectionFromCorner(pos, botFacingDir)
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if turnDirection == 0 {
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panic("at an invalid location somehow")
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}
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instructions = append(instructions, dirAscii)
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botFacingDir = botFacingDir.getNewFacingDir(turnDirection)
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numMoved := 0
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for {
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cell, newY, newX := grid.getCellTypeInDirection(pos.Y, pos.X, botFacingDir)
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if cell != cellTypeScaffold {
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break
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}
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pos.X = newX
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pos.Y = newY
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numMoved++
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}
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instructions = append(instructions, fmt.Sprintf("%d", numMoved))
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}
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return buildInstructionString(instructions)
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}
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func (d *Day17) Part1() string {
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grid := day17Grid{}
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y := 0
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var botLocation u.Vec2i
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var botFacingDir botFacing
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d.program.RunIn(func(inputStep int) int64 {
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return 0
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}, func(val int64, state u.IntcodeProgramState) {
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rVal := rune(val)
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y, botLocation, botFacingDir = grid.processGridUpdate(y, rVal, botLocation, botFacingDir)
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})
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alignmentParameterTotal := 0
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grid.forEachCellOfType(cellTypeScaffold, func(y, x int) {
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if numSurrounding := len(grid.getAdjacentScaffolds(y, x)); numSurrounding == 4 {
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alignmentParameterTotal += y * x
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}
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})
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// endLocation := grid.findEndLocation(botLocation)
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// grid.Draw(botLocation, botFacingDir, endLocation)
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return fmt.Sprintf("Alignment parameter sum: %s%d%s", u.TextBold, alignmentParameterTotal, u.TextReset)
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}
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func (d *Day17) Part2() string {
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beforeGrid := day17Grid{}
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var beforeBotLocation u.Vec2i
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var beforeBotFacing botFacing
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afterGrid := day17Grid{}
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var afterBotLocation u.Vec2i
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var afterBotFacing botFacing
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d.program.Reset()
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d.program.SetMemory(0, 2)
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row := 0
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var outputState int
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var lastOutput int64
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var instructionStr string
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d.program.RunIn(func(inputStep int) int64 {
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return int64(instructionStr[inputStep-1])
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}, func(val int64, state u.IntcodeProgramState) {
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rVal := rune(val)
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if outputState == 0 {
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row, beforeBotLocation, beforeBotFacing = beforeGrid.processGridUpdate(row, rVal, beforeBotLocation, beforeBotFacing)
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} else if outputState == 2 {
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row, afterBotLocation, afterBotFacing = afterGrid.processGridUpdate(row, rVal, afterBotLocation, afterBotFacing)
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}
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if rVal == '\n' && lastOutput == '\n' {
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if outputState == 0 {
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instructionStr = beforeGrid.solvePath(beforeBotLocation, beforeBotFacing)
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}
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outputState++
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row = 0
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}
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lastOutput = val
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})
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// fmt.Println("initial grid:")
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// beforeEndLocation := beforeGrid.findEndLocation(beforeBotLocation)
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// beforeGrid.Draw(beforeBotLocation, beforeBotFacing, beforeEndLocation)
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// fmt.Println("completed grid:")
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// afterEndLocation := afterGrid.findEndLocation(afterBotLocation)
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// afterGrid.Draw(afterBotLocation, afterBotFacing, afterEndLocation)
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return fmt.Sprintf("Dust collected after traveling all paths: %s%d%s", u.TextBold, lastOutput, u.TextReset)
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}
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1
inputs/17p.txt
Normal file
1
inputs/17p.txt
Normal file
@ -0,0 +1 @@
|
||||
1,330,331,332,109,2734,1102,1182,1,15,1102,1,1429,24,1002,0,1,570,1006,570,36,1001,571,0,0,1001,570,-1,570,1001,24,1,24,1106,0,18,1008,571,0,571,1001,15,1,15,1008,15,1429,570,1006,570,14,21102,58,1,0,1105,1,786,1006,332,62,99,21101,0,333,1,21102,73,1,0,1105,1,579,1101,0,0,572,1101,0,0,573,3,574,101,1,573,573,1007,574,65,570,1005,570,151,107,67,574,570,1005,570,151,1001,574,-64,574,1002,574,-1,574,1001,572,1,572,1007,572,11,570,1006,570,165,101,1182,572,127,1001,574,0,0,3,574,101,1,573,573,1008,574,10,570,1005,570,189,1008,574,44,570,1006,570,158,1105,1,81,21102,1,340,1,1105,1,177,21101,0,477,1,1106,0,177,21101,0,514,1,21101,0,176,0,1106,0,579,99,21102,1,184,0,1106,0,579,4,574,104,10,99,1007,573,22,570,1006,570,165,1001,572,0,1182,21102,1,375,1,21101,211,0,0,1106,0,579,21101,1182,11,1,21102,1,222,0,1105,1,979,21102,1,388,1,21102,233,1,0,1105,1,579,21101,1182,22,1,21101,0,244,0,1106,0,979,21101,401,0,1,21101,0,255,0,1105,1,579,21101,1182,33,1,21102,266,1,0,1106,0,979,21102,1,414,1,21102,1,277,0,1106,0,579,3,575,1008,575,89,570,1008,575,121,575,1,575,570,575,3,574,1008,574,10,570,1006,570,291,104,10,21102,1182,1,1,21101,313,0,0,1106,0,622,1005,575,327,1102,1,1,575,21102,327,1,0,1105,1,786,4,438,99,0,1,1,6,77,97,105,110,58,10,33,10,69,120,112,101,99,116,101,100,32,102,117,110,99,116,105,111,110,32,110,97,109,101,32,98,117,116,32,103,111,116,58,32,0,12,70,117,110,99,116,105,111,110,32,65,58,10,12,70,117,110,99,116,105,111,110,32,66,58,10,12,70,117,110,99,116,105,111,110,32,67,58,10,23,67,111,110,116,105,110,117,111,117,115,32,118,105,100,101,111,32,102,101,101,100,63,10,0,37,10,69,120,112,101,99,116,101,100,32,82,44,32,76,44,32,111,114,32,100,105,115,116,97,110,99,101,32,98,117,116,32,103,111,116,58,32,36,10,69,120,112,101,99,116,101,100,32,99,111,109,109,97,32,111,114,32,110,101,119,108,105,110,101,32,98,117,116,32,103,111,116,58,32,43,10,68,101,102,105,110,105,116,105,111,110,115,32,109,97,121,32,98,101,32,97,116,32,109,111,115,116,32,50,48,32,99,104,97,114,97,99,116,101,114,115,33,10,94,62,118,60,0,1,0,-1,-1,0,1,0,0,0,0,0,0,1,6,0,0,109,4,1202,-3,1,587,20101,0,0,-1,22101,1,-3,-3,21101,0,0,-2,2208,-2,-1,570,1005,570,617,2201,-3,-2,609,4,0,21201,-2,1,-2,1105,1,597,109,-4,2106,0,0,109,5,2102,1,-4,630,20102,1,0,-2,22101,1,-4,-4,21102,0,1,-3,2208,-3,-2,570,1005,570,781,2201,-4,-3,652,21002,0,1,-1,1208,-1,-4,570,1005,570,709,1208,-1,-5,570,1005,570,734,1207,-1,0,570,1005,570,759,1206,-1,774,1001,578,562,684,1,0,576,576,1001,578,566,692,1,0,577,577,21101,0,702,0,1105,1,786,21201,-1,-1,-1,1106,0,676,1001,578,1,578,1008,578,4,570,1006,570,724,1001,578,-4,578,21101,0,731,0,1106,0,786,1105,1,774,1001,578,-1,578,1008,578,-1,570,1006,570,749,1001,578,4,578,21101,0,756,0,1106,0,786,1106,0,774,21202,-1,-11,1,22101,1182,1,1,21102,774,1,0,1105,1,622,21201,-3,1,-3,1105,1,640,109,-5,2106,0,0,109,7,1005,575,802,21002,576,1,-6,20101,0,577,-5,1105,1,814,21102,1,0,-1,21102,1,0,-5,21102,0,1,-6,20208,-6,576,-2,208,-5,577,570,22002,570,-2,-2,21202,-5,29,-3,22201,-6,-3,-3,22101,1429,-3,-3,1202,-3,1,843,1005,0,863,21202,-2,42,-4,22101,46,-4,-4,1206,-2,924,21102,1,1,-1,1105,1,924,1205,-2,873,21102,1,35,-4,1105,1,924,1202,-3,1,878,1008,0,1,570,1006,570,916,1001,374,1,374,2101,0,-3,895,1101,2,0,0,2102,1,-3,902,1001,438,0,438,2202,-6,-5,570,1,570,374,570,1,570,438,438,1001,578,558,922,20101,0,0,-4,1006,575,959,204,-4,22101,1,-6,-6,1208,-6,29,570,1006,570,814,104,10,22101,1,-5,-5,1208,-5,45,570,1006,570,810,104,10,1206,-1,974,99,1206,-1,974,1101,1,0,575,21101,973,0,0,1105,1,786,99,109,-7,2105,1,0,109,6,21101,0,0,-4,21102,1,0,-3,203,-2,22101,1,-3,-3,21208,-2,82,-1,1205,-1,1030,21208,-2,76,-1,1205,-1,1037,21207,-2,48,-1,1205,-1,1124,22107,57,-2,-1,1205,-1,1124,21201,-2,-48,-2,1105,1,1041,21102,-4,1,-2,1106,0,1041,21101,-5,0,-2,21201,-4,1,-4,21207,-4,11,-1,1206,-1,1138,2201,-5,-4,1059,1201,-2,0,0,203,-2,22101,1,-3,-3,21207,-2,48,-1,1205,-1,1107,22107,57,-2,-1,1205,-1,1107,21201,-2,-48,-2,2201,-5,-4,1090,20102,10,0,-1,22201,-2,-1,-2,2201,-5,-4,1103,2101,0,-2,0,1106,0,1060,21208,-2,10,-1,1205,-1,1162,21208,-2,44,-1,1206,-1,1131,1105,1,989,21101,439,0,1,1105,1,1150,21102,1,477,1,1105,1,1150,21102,1,514,1,21102,1,1149,0,1105,1,579,99,21101,1157,0,0,1106,0,579,204,-2,104,10,99,21207,-3,22,-1,1206,-1,1138,2101,0,-5,1176,1202,-4,1,0,109,-6,2105,1,0,6,5,28,1,28,1,28,1,28,1,28,1,20,11,1,7,10,1,7,1,1,1,1,1,5,1,10,1,5,11,1,1,10,1,5,1,1,1,1,1,1,1,3,1,1,1,10,9,1,1,1,1,1,5,16,1,3,1,1,1,1,1,1,1,18,5,1,1,1,1,1,1,24,1,1,1,1,1,24,1,1,1,1,1,24,1,1,1,1,1,24,5,7,1,18,1,9,1,18,1,9,1,18,1,9,1,18,1,9,1,18,1,9,1,12,7,9,1,12,1,15,1,12,1,15,1,12,1,15,1,12,1,15,1,12,1,15,1,2,5,5,1,9,7,2,1,3,1,5,1,9,1,8,1,3,1,5,1,9,1,8,1,3,1,5,1,9,1,8,1,3,13,3,1,8,1,9,1,5,1,3,1,8,11,5,1,1,5,22,1,1,1,1,1,1,1,22,1,1,1,1,1,1,1,22,1,1,1,1,1,1,1,22,13,18,1,1,1,1,1,5,1,16,5,1,1,5,1,16,1,1,1,3,1,5,1,16,1,1,11,16,1,5,1,22,7,6
|
||||
1
main.go
1
main.go
@ -47,6 +47,7 @@ var dayMap = []day{
|
||||
&days.Day14{},
|
||||
&days.Day15{},
|
||||
&days.Day16{},
|
||||
&days.Day17{},
|
||||
}
|
||||
|
||||
func main() {
|
||||
|
||||
@ -13,6 +13,8 @@ type Vec3[T Number] struct {
|
||||
Z T
|
||||
}
|
||||
|
||||
type Vec2i Vec2[int]
|
||||
|
||||
func (v Vec2[T]) Dot(other Vec2[T]) T {
|
||||
return (v.X * other.X) + (v.Y * other.Y)
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user