Optimizations and minor cleanups

Thanks to Go's profiling tools, I discovered that the memoization, while it was cutting down runtime significantly, was itself slow because it was using arrays. Swapping those arrays out for maps made a _massive_ difference (4s/14s part1/part2 to 1ms/2ms with no other changes). Lesson learned. Again.

The IntHeap rename was long overdue since I took the code originally from Go's sample docs for priority queues.

days/03.go

@@ -6,29 +6,24 @@ import (
 	"strconv"
 	"strings"
 
-	"parnic.com/aoc2019/utilities"
+	u "parnic.com/aoc2019/utilities"
 )
 
-type Pair[T, U any] struct {
-	a T
-	b U
-}
-
 type Day03 struct {
-	line1    []Pair[byte, int]
-	line2    []Pair[byte, int]
-	visited  map[Pair[int, int]]int
-	overlaps []Pair[Pair[int, int], int]
+	line1    []u.Pair[byte, int]
+	line2    []u.Pair[byte, int]
+	visited  map[u.Pair[int, int]]int
+	overlaps []u.Pair[u.Pair[int, int], int]
 }
 
 func (d *Day03) Parse() {
-	lines := utilities.GetStringLines("03p")
+	lines := u.GetStringLines("03p")
 
 	line1data := strings.Split(lines[0], ",")
 	line2data := strings.Split(lines[1], ",")
 
-	d.line1 = make([]Pair[byte, int], len(line1data))
-	d.line2 = make([]Pair[byte, int], len(line2data))
+	d.line1 = make([]u.Pair[byte, int], len(line1data))
+	d.line2 = make([]u.Pair[byte, int], len(line2data))
 
 	for idx, instr := range line1data {
 		dir := instr[0]
@@ -38,7 +33,7 @@ func (d *Day03) Parse() {
 			panic(err)
 		}
 
-		d.line1[idx] = Pair[byte, int]{a: dir, b: iAmt}
+		d.line1[idx] = u.Pair[byte, int]{First: dir, Second: iAmt}
 	}
 
 	for idx, instr := range line2data {
@@ -49,7 +44,7 @@ func (d *Day03) Parse() {
 			panic(err)
 		}
 
-		d.line2[idx] = Pair[byte, int]{a: dir, b: iAmt}
+		d.line2[idx] = u.Pair[byte, int]{First: dir, Second: iAmt}
 	}
 }
 
@@ -58,96 +53,96 @@ func (d Day03) Num() int {
 }
 
 func (d *Day03) Part1() string {
-	d.visited = make(map[Pair[int, int]]int)
+	d.visited = make(map[u.Pair[int, int]]int)
 	var x int
 	var y int
 	var steps int
 	for _, inst := range d.line1 {
-		switch inst.a {
+		switch inst.First {
 		case 'R':
-			for i := 1; i <= inst.b; i++ {
+			for i := 1; i <= inst.Second; i++ {
 				steps++
-				d.visited[Pair[int, int]{a: x + i, b: y}] = steps
+				d.visited[u.Pair[int, int]{First: x + i, Second: y}] = steps
 			}
-			x += inst.b
+			x += inst.Second
 		case 'U':
-			for i := 1; i <= inst.b; i++ {
+			for i := 1; i <= inst.Second; i++ {
 				steps++
-				d.visited[Pair[int, int]{a: x, b: y + i}] = steps
+				d.visited[u.Pair[int, int]{First: x, Second: y + i}] = steps
 			}
-			y += inst.b
+			y += inst.Second
 		case 'L':
-			for i := 1; i <= inst.b; i++ {
+			for i := 1; i <= inst.Second; i++ {
 				steps++
-				d.visited[Pair[int, int]{a: x - i, b: y}] = steps
+				d.visited[u.Pair[int, int]{First: x - i, Second: y}] = steps
 			}
-			x -= inst.b
+			x -= inst.Second
 		case 'D':
-			for i := 1; i <= inst.b; i++ {
+			for i := 1; i <= inst.Second; i++ {
 				steps++
-				d.visited[Pair[int, int]{a: x, b: y - i}] = steps
+				d.visited[u.Pair[int, int]{First: x, Second: y - i}] = steps
 			}
-			y -= inst.b
+			y -= inst.Second
 		}
 	}
 
 	x = 0
 	y = 0
 	steps = 0
-	d.overlaps = make([]Pair[Pair[int, int], int], 0)
+	d.overlaps = make([]u.Pair[u.Pair[int, int], int], 0)
 	for _, inst := range d.line2 {
-		switch inst.a {
+		switch inst.First {
 		case 'R':
-			for i := 1; i <= inst.b; i++ {
+			for i := 1; i <= inst.Second; i++ {
 				steps++
-				if _, exists := d.visited[Pair[int, int]{x + i, y}]; exists {
-					d.overlaps = append(d.overlaps, Pair[Pair[int, int], int]{a: Pair[int, int]{x + i, y}, b: steps})
+				if _, exists := d.visited[u.Pair[int, int]{First: x + i, Second: y}]; exists {
+					d.overlaps = append(d.overlaps, u.Pair[u.Pair[int, int], int]{First: u.Pair[int, int]{First: x + i, Second: y}, Second: steps})
 				}
 			}
-			x += inst.b
+			x += inst.Second
 		case 'U':
-			for i := 1; i <= inst.b; i++ {
+			for i := 1; i <= inst.Second; i++ {
 				steps++
-				if _, exists := d.visited[Pair[int, int]{x, y + i}]; exists {
-					d.overlaps = append(d.overlaps, Pair[Pair[int, int], int]{a: Pair[int, int]{x, y + i}, b: steps})
+				if _, exists := d.visited[u.Pair[int, int]{First: x, Second: y + i}]; exists {
+					d.overlaps = append(d.overlaps, u.Pair[u.Pair[int, int], int]{First: u.Pair[int, int]{First: x, Second: y + i}, Second: steps})
 				}
 			}
-			y += inst.b
+			y += inst.Second
 		case 'L':
-			for i := 1; i <= inst.b; i++ {
+			for i := 1; i <= inst.Second; i++ {
 				steps++
-				if _, exists := d.visited[Pair[int, int]{x - i, y}]; exists {
-					d.overlaps = append(d.overlaps, Pair[Pair[int, int], int]{a: Pair[int, int]{x - i, y}, b: steps})
+				if _, exists := d.visited[u.Pair[int, int]{First: x - i, Second: y}]; exists {
+					d.overlaps = append(d.overlaps, u.Pair[u.Pair[int, int], int]{First: u.Pair[int, int]{First: x - i, Second: y}, Second: steps})
 				}
 			}
-			x -= inst.b
+			x -= inst.Second
 		case 'D':
-			for i := 1; i <= inst.b; i++ {
+			for i := 1; i <= inst.Second; i++ {
 				steps++
-				if _, exists := d.visited[Pair[int, int]{x, y - i}]; exists {
-					d.overlaps = append(d.overlaps, Pair[Pair[int, int], int]{a: Pair[int, int]{x, y - i}, b: steps})
+				if _, exists := d.visited[u.Pair[int, int]{First: x, Second: y - i}]; exists {
+					d.overlaps = append(d.overlaps, u.Pair[u.Pair[int, int], int]{First: u.Pair[int, int]{First: x, Second: y - i}, Second: steps})
 				}
 			}
-			y -= inst.b
+			y -= inst.Second
 		}
 	}
 
 	minDist := math.MaxInt
 	for _, overlap := range d.overlaps {
-		dist := int(math.Abs(float64(overlap.a.a))) + int(math.Abs(float64(overlap.a.b)))
+		dist := int(math.Abs(float64(overlap.First.First))) + int(math.Abs(float64(overlap.First.Second)))
 		if dist < minDist {
 			minDist = dist
 		}
 	}
 
-	return fmt.Sprintf("Closest overlap manhattan distance = %s%d%s", utilities.TextBold, minDist, utilities.TextReset)
+	return fmt.Sprintf("Closest overlap manhattan distance = %s%d%s", u.TextBold, minDist, u.TextReset)
 }
 
 func (d *Day03) Part2() string {
 	minOverlap := math.MaxInt
 	for _, overlap := range d.overlaps {
-		line1Steps := d.visited[overlap.a]
-		line2Steps := overlap.b
+		line1Steps := d.visited[overlap.First]
+		line2Steps := overlap.Second
 
 		totalSteps := line1Steps + line2Steps
 		if totalSteps < minOverlap {
@@ -155,5 +150,5 @@ func (d *Day03) Part2() string {
 		}
 	}
 
-	return fmt.Sprintf("Minimum steps to overlap = %s%d%s", utilities.TextBold, minOverlap, utilities.TextReset)
+	return fmt.Sprintf("Minimum steps to overlap = %s%d%s", u.TextBold, minOverlap, u.TextReset)
 }

days/06.go

@@ -0,0 +1,114 @@
+package days
+
+import (
+	"fmt"
+	"strings"
+
+	"parnic.com/aoc2019/utilities"
+)
+
+type body struct {
+	orbits *body
+	obj    string
+}
+
+type Day06 struct {
+	allBodies []*body
+}
+
+func (d *Day06) Parse() {
+	d.allBodies = make([]*body, 0)
+
+	getOrAddBody := func(obj string) *body {
+		target := d.findBody(obj)
+		if target == nil {
+			target = &body{
+				obj: obj,
+			}
+			d.allBodies = append(d.allBodies, target)
+		}
+
+		return target
+	}
+
+	lines := utilities.GetStringLines("06p")
+	for _, line := range lines {
+		bodies := strings.Split(line, ")")
+		newBody := getOrAddBody(bodies[1])
+
+		target := getOrAddBody(bodies[0])
+		newBody.orbits = target
+	}
+}
+
+func (d *Day06) findBody(obj string) *body {
+	for _, checkBody := range d.allBodies {
+		if checkBody.obj == obj {
+			return checkBody
+		}
+	}
+
+	return nil
+}
+
+func (d Day06) Num() int {
+	return 6
+}
+
+func (d *Day06) Part1() string {
+	orbits := 0
+	for _, obj := range d.allBodies {
+		next := obj.orbits
+		for next != nil {
+			next = next.orbits
+			orbits++
+		}
+	}
+
+	return fmt.Sprintf("Total orbits: %s%d%s", utilities.TextBold, orbits, utilities.TextReset)
+}
+
+func (d *Day06) Part2() string {
+	you := d.findBody("YOU")
+	san := d.findBody("SAN")
+
+	youChildren := make([]*body, 0)
+	next := you.orbits
+	for next != nil {
+		youChildren = append(youChildren, next)
+		next = next.orbits
+	}
+
+	var linkingNode *body
+	next = san.orbits
+	for next != nil {
+		if utilities.ArrayContains(youChildren, next) {
+			linkingNode = next
+			break
+		}
+		next = next.orbits
+	}
+
+	if linkingNode == nil {
+		panic("")
+	}
+
+	getDistToLinking := func(start *body) int {
+		dist := 0
+		next = start.orbits
+		for next != nil {
+			if next == linkingNode {
+				break
+			}
+			dist++
+			next = next.orbits
+		}
+
+		return dist
+	}
+
+	distYouToLinking := getDistToLinking(you)
+	distSanToLinking := getDistToLinking(san)
+
+	return fmt.Sprintf("Transfers to get to Santa: %s%d%s", utilities.TextBold, distYouToLinking+distSanToLinking, utilities.TextReset)
+}

days/07.go

@@ -0,0 +1,116 @@
+package days
+
+import (
+	"fmt"
+	"sync"
+
+	"parnic.com/aoc2019/utilities"
+)
+
+type Day07 struct {
+	program utilities.IntcodeProgram
+	amps    []utilities.IntcodeProgram
+}
+
+func (d *Day07) Parse() {
+	d.program = utilities.LoadIntcodeProgram("07p")
+	d.amps = make([]utilities.IntcodeProgram, 5)
+	for i := range d.amps {
+		d.amps[i] = d.program.Copy()
+	}
+}
+
+func (d Day07) Num() int {
+	return 7
+}
+
+func (d *Day07) Part1() string {
+	var highestVal int64
+	var highestSequence []int64
+
+	allSequences := utilities.GetPermutations([]int64{0, 1, 2, 3, 4}...)
+	for _, sequence := range allSequences {
+		if len(sequence) != len(d.amps) {
+			panic("input sequence does not match up to number of amplifiers")
+		}
+
+		input := int64(0)
+		var output int64
+		for i, amp := range d.amps {
+			amp.RunIn(func(step int) int64 {
+				if step == 1 {
+					return sequence[i]
+				} else if step == 2 {
+					return input
+				}
+
+				panic("hit more input instructions than expected")
+			}, func(val int64, state utilities.IntcodeProgramState) {
+				output = val
+			})
+
+			input = output
+		}
+
+		if output > highestVal {
+			highestVal = output
+			if highestSequence == nil {
+				highestSequence = make([]int64, len(sequence))
+			}
+			copy(highestSequence, sequence)
+		}
+	}
+
+	return fmt.Sprintf("Max thruster signal: %s%d%s (produced by %v)", utilities.TextBold, highestVal, utilities.TextReset, highestSequence)
+}
+
+func (d *Day07) Part2() string {
+	var highestVal int64
+	var highestSequence []int64
+
+	allSequences := utilities.GetPermutations([]int64{5, 6, 7, 8, 9}...)
+	for _, sequence := range allSequences {
+		if len(sequence) != len(d.amps) {
+			panic("input sequence does not match up to number of amplifiers")
+		}
+
+		inputs := make([]chan int64, len(d.amps))
+		for i := range d.amps {
+			d.amps[i].Reset()
+			inputs[i] = make(chan int64, 1)
+			inputs[i] <- sequence[i]
+		}
+
+		var finalOutput int64
+		var wg sync.WaitGroup
+		for i := range d.amps {
+			wg.Add(1)
+			go func(idx int) {
+				d.amps[idx].RunIn(func(step int) int64 {
+					input := <-inputs[idx]
+					return input
+				}, func(val int64, state utilities.IntcodeProgramState) {
+					finalOutput = val
+					inputIdx := idx + 1
+					if inputIdx == len(inputs) {
+						inputIdx = 0
+					}
+					inputs[inputIdx] <- val
+				})
+				wg.Done()
+			}(i)
+		}
+		inputs[0] <- 0
+		wg.Wait()
+
+		if finalOutput > highestVal {
+			highestVal = finalOutput
+			if highestSequence == nil {
+				highestSequence = make([]int64, len(sequence))
+			}
+			copy(highestSequence, sequence)
+		}
+	}
+
+	return fmt.Sprintf("Max thruster signal: %s%d%s (produced by %v)", utilities.TextBold, highestVal, utilities.TextReset, highestSequence)
+}

days/08.go

@@ -0,0 +1,102 @@
+package days
+
+import (
+	"fmt"
+	"math"
+	"strings"
+
+	"parnic.com/aoc2019/utilities"
+)
+
+type Day08 struct {
+	img [][]int
+}
+
+const (
+	imgWidth  = 25
+	imgHeight = 6
+)
+
+func (d *Day08) Parse() {
+	contents := utilities.GetStringContents("08p")
+	imgSize := imgWidth * imgHeight
+	layers := len(contents) / imgSize
+	d.img = make([][]int, layers)
+	for layer := 0; layer < layers; layer++ {
+		d.img[layer] = make([]int, imgSize)
+		for i := 0; i < imgSize; i++ {
+			d.img[layer][i] = int(contents[(layer*imgSize)+i] - '0')
+		}
+	}
+}
+
+func (d Day08) Num() int {
+	return 8
+}
+
+func (d *Day08) Part1() string {
+	fewestZeroes := math.MaxInt
+	var layerFewestZeroes int
+	for layer := range d.img {
+		zeroes := 0
+		for i := range d.img[layer] {
+			if d.img[layer][i] == 0 {
+				zeroes++
+			}
+		}
+
+		if zeroes < fewestZeroes {
+			fewestZeroes = zeroes
+			layerFewestZeroes = layer
+		}
+	}
+
+	numOne := 0
+	numTwo := 0
+	for i := range d.img[layerFewestZeroes] {
+		if d.img[layerFewestZeroes][i] == 1 {
+			numOne++
+		} else if d.img[layerFewestZeroes][i] == 2 {
+			numTwo++
+		}
+	}
+
+	return fmt.Sprintf("Fewest zeroes on layer %d, #1s * #2s = %d * %d = %s%d%s",
+		layerFewestZeroes,
+		numOne,
+		numTwo,
+		utilities.TextBold,
+		numOne*numTwo,
+		utilities.TextReset,
+	)
+}
+
+func (d *Day08) Part2() string {
+	imgSize := imgWidth * imgHeight
+	finalImg := make([]int, imgSize)
+	for i := 0; i < imgSize; i++ {
+		for layer := 0; layer < len(d.img); layer++ {
+			if d.img[layer][i] != 2 {
+				finalImg[i] = d.img[layer][i]
+				break
+			}
+		}
+	}
+
+	outStr := strings.Builder{}
+	outStr.WriteString("Message received:\n")
+	outStr.WriteString(utilities.TextBold)
+	for y := 0; y < imgHeight; y++ {
+		for x := 0; x < imgWidth; x++ {
+			if finalImg[(y*imgWidth)+x] == 0 {
+				outStr.WriteRune(' ')
+			} else {
+				outStr.WriteRune('█')
+			}
+		}
+		outStr.WriteRune('\n')
+	}
+	outStr.WriteString(utilities.TextReset)
+
+	return outStr.String()
+}

days/09.go

@@ -0,0 +1,42 @@
+package days
+
+import (
+	"fmt"
+
+	"parnic.com/aoc2019/utilities"
+)
+
+type Day09 struct {
+	program utilities.IntcodeProgram
+}
+
+func (d *Day09) Parse() {
+	d.program = utilities.LoadIntcodeProgram("09p")
+}
+
+func (d Day09) Num() int {
+	return 9
+}
+
+func (d *Day09) Part1() string {
+	var code int64
+	d.program.RunIn(func(inputStep int) int64 {
+		return 1
+	}, func(val int64, state utilities.IntcodeProgramState) {
+		code = val
+	})
+
+	return fmt.Sprintf("BOOST keycode: %s%d%s", utilities.TextBold, code, utilities.TextReset)
+}
+
+func (d *Day09) Part2() string {
+	var coordinates int64
+	d.program.Reset()
+	d.program.RunIn(func(inputStep int) int64 {
+		return 2
+	}, func(val int64, state utilities.IntcodeProgramState) {
+		coordinates = val
+	})
+
+	return fmt.Sprintf("Coordinates: %s%d%s", utilities.TextBold, coordinates, utilities.TextReset)
+}

days/10.go

@@ -0,0 +1,171 @@
+package days
+
+import (
+	"fmt"
+	"sort"
+
+	u "parnic.com/aoc2019/utilities"
+)
+
+type Day10 struct {
+	asteroids     [][]bool
+	idealLocation u.Vec2[int]
+}
+
+func (d *Day10) Parse() {
+	lines := u.GetStringLines("10p")
+	d.asteroids = make([][]bool, len(lines))
+	for i, line := range lines {
+		d.asteroids[i] = make([]bool, len(line))
+		for j, ch := range line {
+			d.asteroids[i][j] = ch == '#'
+		}
+	}
+}
+
+func (d Day10) Num() int {
+	return 10
+}
+
+// func (d Day10) draw() {
+// 	for i := range d.asteroids {
+// 		for j := range d.asteroids[i] {
+// 			if !d.asteroids[i][j].First {
+// 				fmt.Print(".")
+// 			} else {
+// 				num := d.asteroids[i][j].Second
+// 				ch := rune('0') + rune(num)
+// 				if num >= 10 {
+// 					ch = '+'
+// 				}
+// 				fmt.Printf("%c", ch)
+// 			}
+// 		}
+// 		fmt.Println()
+// 	}
+// }
+
+func (d Day10) getVisibleAsteroids(i1, j1 int) []u.Vec2[int] {
+	visited := make([]u.Vec2[int], 0)
+	foundAsteroids := make([]u.Vec2[int], 0)
+
+	findNext := func(startX, startY, incX, incY int) *u.Vec2[int] {
+		var found *u.Vec2[int]
+		if incX == 0 && incY == 0 {
+			return found
+		}
+
+		x := startX + incX
+		y := startY + incY
+		for x < len(d.asteroids) && x >= 0 && y < len(d.asteroids[x]) && y >= 0 {
+			currPair := u.Vec2[int]{X: x, Y: y}
+			if !u.ArrayContains(visited, currPair) {
+				visited = append(visited, currPair)
+
+				if d.asteroids[x][y] {
+					if found == nil {
+						found = &currPair
+					}
+				}
+			}
+
+			x += incX
+			y += incY
+		}
+
+		return found
+	}
+
+	for incX := 0; ; {
+		plusXValid := i1+incX < len(d.asteroids)
+		minusXValid := i1-incX >= 0
+		if !plusXValid && !minusXValid {
+			break
+		}
+
+		for incY := 0; ; {
+			plusYValid := j1+incY < len(d.asteroids[0])
+			minusYValid := j1-incY >= 0
+			if !plusYValid && !minusYValid {
+				break
+			}
+
+			if found := findNext(i1, j1, incX, incY); found != nil {
+				foundAsteroids = append(foundAsteroids, *found)
+			}
+			if found := findNext(i1, j1, incX, -incY); found != nil {
+				foundAsteroids = append(foundAsteroids, *found)
+			}
+			if found := findNext(i1, j1, -incX, incY); found != nil {
+				foundAsteroids = append(foundAsteroids, *found)
+			}
+			if found := findNext(i1, j1, -incX, -incY); found != nil {
+				foundAsteroids = append(foundAsteroids, *found)
+			}
+
+			incY++
+		}
+
+		incX++
+	}
+
+	return foundAsteroids
+}
+
+func (d Day10) numVisibleAsteroids(i1, j1 int) int {
+	return len(d.getVisibleAsteroids(i1, j1))
+}
+
+func (d *Day10) removeAsteroids(locs ...u.Vec2[int]) {
+	for _, loc := range locs {
+		if !d.asteroids[loc.X][loc.Y] {
+			panic("tried to remove non-asteroid")
+		}
+
+		d.asteroids[loc.X][loc.Y] = false
+	}
+}
+
+func (d *Day10) Part1() string {
+	mostAsteroids := 0
+	for i := range d.asteroids {
+		for j := range d.asteroids[i] {
+			if d.asteroids[i][j] {
+				numVisible := d.numVisibleAsteroids(i, j)
+				if numVisible > mostAsteroids {
+					mostAsteroids = numVisible
+					d.idealLocation = u.Vec2[int]{X: i, Y: j}
+				}
+			}
+		}
+	}
+
+	return fmt.Sprintf("Most visible asteroids: %s%d%s at (%d,%d)", u.TextBold, mostAsteroids, u.TextReset, d.idealLocation.Y, d.idealLocation.X)
+}
+
+func (d *Day10) Part2() string {
+	findNumVaporized := 200
+	var targetLocation u.Vec2[int]
+
+	vaporized := 0
+	for vaporized < findNumVaporized {
+		visibleAsteroids := d.getVisibleAsteroids(d.idealLocation.X, d.idealLocation.Y)
+		if len(visibleAsteroids) == 0 {
+			panic("no more asteroids to vaporize")
+		}
+
+		if vaporized+len(visibleAsteroids) < findNumVaporized {
+			vaporized += len(visibleAsteroids)
+			d.removeAsteroids(visibleAsteroids...)
+			continue
+		}
+
+		sort.Slice(visibleAsteroids, func(i, j int) bool {
+			return d.idealLocation.AngleBetween(visibleAsteroids[i]) > d.idealLocation.AngleBetween(visibleAsteroids[j])
+		})
+		targetLocation = visibleAsteroids[findNumVaporized-1-vaporized]
+		break
+	}
+
+	return fmt.Sprintf("#%d asteroid to be vaporized is at (%d,%d), transformed: %s%d%s", findNumVaporized, targetLocation.Y, targetLocation.X, u.TextBold, (targetLocation.Y*100)+targetLocation.X, u.TextReset)
+}

days/11.go

@@ -0,0 +1,118 @@
+package days
+
+import (
+	"fmt"
+	"strings"
+
+	u "parnic.com/aoc2019/utilities"
+)
+
+type Day11 struct {
+	program u.IntcodeProgram
+	painted map[u.Pair[int, int]]int
+}
+
+func (d *Day11) Parse() {
+	d.program = u.LoadIntcodeProgram("11p")
+}
+
+func (d Day11) Num() int {
+	return 11
+}
+
+func (d *Day11) paintHull() (int, u.Pair[int, int], u.Pair[int, int]) {
+	pos := u.Pair[int, int]{First: 0, Second: 0}
+	facing := 0
+
+	min := pos
+	max := pos
+
+	outputState := 0
+	numPainted := 1
+	d.program.RunIn(func(inputStep int) int64 {
+		return int64(d.painted[pos])
+	}, func(val int64, state u.IntcodeProgramState) {
+		if outputState == 0 {
+			outputState++
+			color := int(val)
+			if _, exists := d.painted[pos]; !exists {
+				numPainted++
+			}
+			d.painted[pos] = color
+		} else {
+			outputState = 0
+			direction := val
+
+			if direction == 0 {
+				facing--
+				if facing == -1 {
+					facing = 3
+				}
+			} else {
+				facing++
+				if facing == 4 {
+					facing = 0
+				}
+			}
+
+			switch facing {
+			case 0:
+				pos.First--
+				if pos.First < min.First {
+					min.First = pos.First
+				}
+			case 1:
+				pos.Second++
+				if pos.Second > max.Second {
+					max.Second = pos.Second
+				}
+			case 2:
+				pos.First++
+				if pos.First > max.First {
+					max.First = pos.First
+				}
+			case 3:
+				pos.Second--
+				if pos.Second < min.Second {
+					min.Second = pos.Second
+				}
+			}
+		}
+	})
+
+	return numPainted, min, max
+}
+
+func (d *Day11) Part1() string {
+	d.painted = map[u.Pair[int, int]]int{
+		{First: 0, Second: 0}: 0,
+	}
+	numPainted, _, _ := d.paintHull()
+
+	return fmt.Sprintf("Unique panels painted: %s%d%s", u.TextBold, numPainted, u.TextReset)
+}
+
+func (d *Day11) Part2() string {
+	d.painted = map[u.Pair[int, int]]int{
+		{First: 0, Second: 0}: 1,
+	}
+	_, min, max := d.paintHull()
+
+	outStr := strings.Builder{}
+	outStr.WriteString("Registration identifier:\n")
+	outStr.WriteString(u.TextBold)
+	for x := min.First; x <= max.First; x++ {
+		for y := min.Second; y <= max.Second; y++ {
+			val, exists := d.painted[u.Pair[int, int]{First: x, Second: y}]
+			if exists && val == 1 {
+				outStr.WriteRune('█')
+			} else {
+				outStr.WriteRune(' ')
+			}
+		}
+		outStr.WriteRune('\n')
+	}
+	outStr.WriteString(u.TextReset)
+
+	return outStr.String()
+}

days/12.go

@@ -0,0 +1,156 @@
+package days
+
+import (
+	"fmt"
+	"math"
+	"strconv"
+	"strings"
+
+	u "parnic.com/aoc2019/utilities"
+)
+
+type moonData struct {
+	pos u.Vec3[int]
+	vel u.Vec3[int]
+}
+
+func (m *moonData) applyGravity(other *moonData) {
+	applyGravityAxis := func(pos1, pos2, vel1, vel2 *int) {
+		if *pos1 < *pos2 {
+			*vel1++
+			*vel2--
+		} else if *pos1 > *pos2 {
+			*vel1--
+			*vel2++
+		}
+	}
+
+	applyGravityAxis(&m.pos.X, &other.pos.X, &m.vel.X, &other.vel.X)
+	applyGravityAxis(&m.pos.Y, &other.pos.Y, &m.vel.Y, &other.vel.Y)
+	applyGravityAxis(&m.pos.Z, &other.pos.Z, &m.vel.Z, &other.vel.Z)
+}
+
+func (m *moonData) applyVelocity() {
+	m.pos.Add(m.vel)
+}
+
+func (m moonData) getPotentialEnergy() int {
+	return int(math.Abs(float64(m.pos.X))) +
+		int(math.Abs(float64(m.pos.Y))) +
+		int(math.Abs(float64(m.pos.Z)))
+}
+
+func (m moonData) getKineticEnergy() int {
+	return int(math.Abs(float64(m.vel.X))) +
+		int(math.Abs(float64(m.vel.Y))) +
+		int(math.Abs(float64(m.vel.Z)))
+}
+
+func (m moonData) getTotalEnergy() int {
+	return m.getPotentialEnergy() * m.getKineticEnergy()
+}
+
+type Day12 struct {
+	moons []*moonData
+}
+
+func (d *Day12) Parse() {
+	lines := u.GetStringLines("12p")
+	d.moons = make([]*moonData, len(lines))
+	for i, line := range lines {
+		trimmed := line[1 : len(line)-1]
+		vals := strings.Split(trimmed, ", ")
+		x, _ := strconv.Atoi(vals[0][2:])
+		y, _ := strconv.Atoi(vals[1][2:])
+		z, _ := strconv.Atoi(vals[2][2:])
+		d.moons[i] = &moonData{
+			pos: u.Vec3[int]{X: x, Y: y, Z: z},
+		}
+	}
+}
+
+func (d Day12) Num() int {
+	return 12
+}
+
+func (d Day12) copyMoons() []*moonData {
+	moons := make([]*moonData, len(d.moons))
+	for i, moon := range d.moons {
+		moonCopy := *moon
+		moons[i] = &moonCopy
+	}
+
+	return moons
+}
+
+func getAllEnergy(moons ...*moonData) int {
+	energy := 0
+	for _, moon := range moons {
+		energy += moon.getTotalEnergy()
+	}
+	return energy
+}
+
+func (d *Day12) Part1() string {
+	moons := d.copyMoons()
+
+	numSteps := 1000
+
+	for i := 0; i < numSteps; i++ {
+		for i, moon1 := range moons {
+			for _, moon2 := range moons[i+1:] {
+				moon1.applyGravity(moon2)
+			}
+
+			moon1.applyVelocity()
+		}
+	}
+
+	return fmt.Sprintf("Total energy after %d steps: %s%d%s", numSteps, u.TextBold, getAllEnergy(moons...), u.TextReset)
+}
+
+func (d *Day12) Part2() string {
+	moons := d.copyMoons()
+
+	orig := make([]u.Vec3[int], len(moons))
+	for i, moon := range moons {
+		orig[i] = moon.pos
+	}
+	period := u.Vec3[int]{}
+
+	for loops := 0; period.X == 0 || period.Y == 0 || period.Z == 0; loops++ {
+		for i, moon1 := range moons {
+			for _, moon2 := range moons[i+1:] {
+				moon1.applyGravity(moon2)
+			}
+			moon1.applyVelocity()
+		}
+
+		foundX := true
+		foundY := true
+		foundZ := true
+		for i, moon := range moons {
+			if moon.pos.X != orig[i].X || moon.vel.X != 0 {
+				foundX = false
+			}
+			if moon.pos.Y != orig[i].Y || moon.vel.Y != 0 {
+				foundY = false
+			}
+			if moon.pos.Z != orig[i].Z || moon.vel.Z != 0 {
+				foundZ = false
+			}
+		}
+		if foundX && period.X == 0 {
+			period.X = loops + 1
+		}
+		if foundY && period.Y == 0 {
+			period.Y = loops + 1
+		}
+		if foundZ && period.Z == 0 {
+			period.Z = loops + 1
+		}
+	}
+
+	stepsRequired := u.LCM(period.X, period.Y, period.Z)
+	return fmt.Sprintf("Iterations to reach a previous state: %s%d%s", u.TextBold, stepsRequired, u.TextReset)
+}

days/13.go

@@ -0,0 +1,147 @@
+package days
+
+import (
+	"fmt"
+
+	u "parnic.com/aoc2019/utilities"
+)
+
+const (
+	tileEmpty   = 0
+	tileWall    = 1
+	tileBlock   = 2
+	tileHPaddle = 3
+	tileBall    = 4
+)
+
+type tile struct {
+	pos u.Vec2[int]
+	id  int
+}
+
+type Day13 struct {
+	program   u.IntcodeProgram
+	tiles     []tile
+	gameBoard [24][45]int
+}
+
+func (d *Day13) Parse() {
+	d.program = u.LoadIntcodeProgram("13p")
+	d.tiles = make([]tile, 0, 1080)
+}
+
+func (d Day13) Num() int {
+	return 13
+}
+
+func (d Day13) getNumBlocks() int {
+	blockTiles := 0
+	for _, tile := range d.tiles {
+		if tile.id == tileBlock {
+			blockTiles++
+		}
+	}
+
+	return blockTiles
+}
+
+// func (d Day13) drawGameBoard() {
+// 	s := strings.Builder{}
+// 	for x := range d.gameBoard {
+// 		for y := range d.gameBoard[x] {
+// 			block := d.gameBoard[x][y]
+// 			if block == tileBlock {
+// 				s.WriteString(u.ColorBlue)
+// 				s.WriteRune('█')
+// 				s.WriteString(u.TextReset)
+// 			} else if block == tileBall {
+// 				s.WriteString(u.ColorGreen)
+// 				s.WriteRune('█')
+// 				s.WriteString(u.TextReset)
+// 			} else if block == tileWall {
+// 				s.WriteString(u.ColorWhite)
+// 				s.WriteRune('█')
+// 				s.WriteString(u.TextReset)
+// 			} else if block == tileHPaddle {
+// 				s.WriteString(u.ColorRed)
+// 				s.WriteRune('█')
+// 				s.WriteString(u.TextReset)
+// 			} else if block == tileEmpty {
+// 				s.WriteRune(' ')
+// 			}
+// 		}
+// 		s.WriteRune('\n')
+// 	}
+
+// 	fmt.Print(s.String())
+// }
+
+func (d *Day13) Part1() string {
+	outputStep := 0
+	var newTilePos u.Vec2[int]
+	d.program.RunIn(func(inputStep int) int64 {
+		return 0
+	}, func(val int64, state u.IntcodeProgramState) {
+		if outputStep == 0 {
+			newTilePos.X = int(val)
+			outputStep++
+		} else if outputStep == 1 {
+			newTilePos.Y = int(val)
+			outputStep++
+		} else {
+			d.tiles = append(d.tiles, tile{
+				pos: newTilePos,
+				id:  int(val),
+			})
+			outputStep = 0
+		}
+	})
+
+	return fmt.Sprintf("# block tiles: %s%d%s (%d total tiles)", u.TextBold, d.getNumBlocks(), u.TextReset, len(d.tiles))
+}
+
+func (d *Day13) Part2() string {
+	d.program.Reset()
+	d.program.SetMemory(0, 2)
+
+	outputStep := 0
+	newTilePos := u.Vec2[int]{}
+	var ball u.Vec2[int]
+	var paddle u.Vec2[int]
+	var score int64
+	d.program.RunIn(func(inputStep int) int64 {
+		if ball.X < paddle.X {
+			return -1
+		} else if ball.X > paddle.X {
+			return 1
+		}
+
+		return 0
+	}, func(val int64, state u.IntcodeProgramState) {
+		if outputStep == 0 {
+			newTilePos.X = int(val)
+			outputStep++
+		} else if outputStep == 1 {
+			newTilePos.Y = int(val)
+			outputStep++
+		} else {
+			if newTilePos.Equals(u.Vec2[int]{X: -1, Y: 0}) {
+				score = val
+			} else {
+				d.gameBoard[newTilePos.Y][newTilePos.X] = int(val)
+
+				if val == tileBall {
+					ball = newTilePos
+				} else if val == tileHPaddle {
+					paddle = newTilePos
+					// d.drawGameBoard()
+					// time.Sleep(time.Millisecond * 33)
+				}
+			}
+
+			outputStep = 0
+		}
+	})
+
+	return fmt.Sprintf("Game over! Score: %s%d%s", u.TextBold, score, u.TextReset)
+}

days/14.go

@@ -0,0 +1,129 @@
+package days
+
+import (
+	"fmt"
+	"math"
+	"strconv"
+	"strings"
+
+	u "parnic.com/aoc2019/utilities"
+)
+
+type reaction struct {
+	inputs map[string]int64
+	output u.Pair[string, int]
+}
+
+type Day14 struct {
+	reactions []reaction
+}
+
+func (d *Day14) Parse() {
+	lines := u.GetStringLines("14p")
+	d.reactions = make([]reaction, len(lines))
+	for i, line := range lines {
+		sides := strings.Split(line, " => ")
+		inputs := strings.Split(sides[0], ", ")
+		output := sides[1]
+
+		outPair := strings.Split(output, " ")
+		outAmt, _ := strconv.Atoi(outPair[0])
+		d.reactions[i].output = u.Pair[string, int]{First: outPair[1], Second: outAmt}
+		d.reactions[i].inputs = make(map[string]int64)
+		for _, input := range inputs {
+			pair := strings.Split(input, " ")
+			d.reactions[i].inputs[pair[1]], _ = strconv.ParseInt(pair[0], 10, 64)
+		}
+	}
+}
+
+func (d Day14) getReactionProducing(chem string) *reaction {
+	for _, reaction := range d.reactions {
+		if reaction.output.First == chem {
+			return &reaction
+		}
+	}
+
+	return nil
+}
+
+func (d Day14) Num() int {
+	return 14
+}
+
+func (d *Day14) getOreRequiredForFuel(qty int64) int64 {
+	oreRequired := int64(0)
+	needs := map[string]int64{
+		"FUEL": qty,
+	}
+	excess := make(map[string]int64)
+
+	getFromExcess := func(qty int64, chemical string) int64 {
+		available := u.Min(excess[chemical], qty)
+		excess[chemical] -= available
+		return available
+	}
+
+	for len(needs) > 0 {
+		keys := u.MapKeys(needs)
+		producing := keys[0]
+		qtyRequired := needs[producing]
+		delete(needs, producing)
+
+		fromExcess := getFromExcess(qtyRequired, producing)
+		if fromExcess == qtyRequired {
+			continue
+		}
+		qtyRequired -= fromExcess
+
+		reaction := d.getReactionProducing(producing)
+
+		qtyProduced := int64(reaction.output.Second)
+		reactionsNeeded := int64(math.Ceil(float64(qtyRequired) / float64(qtyProduced)))
+
+		excess[producing] = (qtyProduced * reactionsNeeded) - qtyRequired
+
+		for reagent, inputQty := range reaction.inputs {
+			qtyNeeded := inputQty * reactionsNeeded
+			if reagent == "ORE" {
+				oreRequired += qtyNeeded
+			} else {
+				needs[reagent] += qtyNeeded
+			}
+		}
+	}
+
+	return oreRequired
+}
+
+func (d *Day14) Part1() string {
+	neededOre := d.getOreRequiredForFuel(1)
+	return fmt.Sprintf("Minimum ore to produce 1 FUEL: %s%d%s", u.TextBold, neededOre, u.TextReset)
+}
+
+func (d *Day14) Part2() string {
+	oreAvailable := int64(1000000000000)
+	estimate := oreAvailable / d.getOreRequiredForFuel(1)
+
+	high := estimate * 2
+	low := estimate
+
+	lastSuccess := low
+	lastFailure := high
+	fuelProduced := low
+
+	for math.Abs(float64(lastFailure-lastSuccess)) > 1 {
+		oreConsumed := d.getOreRequiredForFuel(fuelProduced)
+		adjustment := (lastFailure - lastSuccess) / 2
+		if oreConsumed < oreAvailable {
+			lastSuccess = fuelProduced
+		} else {
+			lastFailure = fuelProduced
+			adjustment = -adjustment
+		}
+
+		fuelProduced += adjustment
+	}
+
+	return fmt.Sprintf("Maximum fuel we can make from 1 trillion ore: %s%d%s", u.TextBold, lastSuccess, u.TextReset)
+}

days/15.go

@@ -0,0 +1,332 @@
+package days
+
+//go:generate stringer -type=cellStatus,responseType,dirType -output=15_types_string.go
+
+import (
+	"fmt"
+	"math"
+	"sort"
+
+	u "parnic.com/aoc2019/utilities"
+)
+
+type point u.Pair[int, int]
+type cellStatus int
+type responseType int
+type dirType int
+
+const (
+	cellStatusUnknown cellStatus = iota
+	cellStatusWall
+	cellStatusOpen
+	cellStatusGoal
+)
+
+const (
+	responseWall responseType = iota
+	responseSuccess
+	responseFoundGoal
+)
+
+const maxVisited = 3
+
+const (
+	dirNorth dirType = iota + 1
+	dirSouth
+	dirWest
+	dirEast
+
+	dirFirst = dirNorth
+	dirLast  = dirEast
+)
+
+var dirOrders = [][]dirType{
+	{dirNorth, dirSouth, dirWest, dirEast},
+	{dirSouth, dirWest, dirEast, dirNorth},
+	{dirWest, dirEast, dirNorth, dirSouth},
+	{dirEast, dirNorth, dirSouth, dirWest},
+}
+
+// turned out to be unnecessary on multiple datasets i tried. increases the iterations 6x
+// var dirOrders = u.GetPermutations(dirNorth, dirSouth, dirWest, dirEast)
+
+type visitedStatus struct {
+	timesVisited      int
+	distanceFromStart int
+}
+
+type Day15 struct {
+	program      u.IntcodeProgram
+	grid         map[point]cellStatus
+	visited      map[point]*visitedStatus
+	shortestPath []point
+	pos          point
+	goalPos      point
+}
+
+func (d *Day15) Parse() {
+	d.program = u.LoadIntcodeProgram("15p")
+	d.grid = map[point]cellStatus{
+		{First: 0, Second: 0}: cellStatusOpen,
+	}
+	d.visited = map[point]*visitedStatus{
+		{First: 0, Second: 0}: {timesVisited: 1},
+	}
+	d.shortestPath = []point{{}}
+}
+
+func (d Day15) Num() int {
+	return 15
+}
+
+func (d Day15) getPointInDirection(pos point, dir dirType) point {
+	target := pos
+	switch dir {
+	case dirNorth:
+		target.First--
+	case dirSouth:
+		target.First++
+	case dirWest:
+		target.Second--
+	case dirEast:
+		target.Second++
+	}
+
+	return target
+}
+
+func (d Day15) getCellTypeInDirection(pos point, dir dirType) (cellStatus, point) {
+	target := d.getPointInDirection(pos, dir)
+	return d.grid[target], target
+}
+
+func (d Day15) getAdjacentCellsOfType(pos point, cellType cellStatus) []point {
+	points := make([]point, 0, 4)
+	for i := dirFirst; i <= dirLast; i++ {
+		adjacentCell := d.getPointInDirection(pos, i)
+		if d.grid[adjacentCell] == cellType {
+			points = append(points, adjacentCell)
+		}
+	}
+	return points
+}
+
+func (d Day15) getDirToNextCellType(pos point, t cellStatus, maxNumVisited int, dirs []dirType) (dirType, point, error) {
+	for _, dir := range dirs {
+		cellInDirection, targetCell := d.getCellTypeInDirection(pos, dir)
+		if cellInDirection == t {
+			_, visitedTargetExists := d.visited[targetCell]
+			foundUnknown := t == cellStatusUnknown && !visitedTargetExists
+			foundOther := t != cellStatusUnknown && visitedTargetExists && d.visited[targetCell].timesVisited <= maxNumVisited
+			if foundUnknown || foundOther {
+				return dir, targetCell, nil
+			}
+		}
+	}
+
+	return dirFirst, point{}, fmt.Errorf("no %v tiles around %v", t, pos)
+}
+
+func (d *Day15) Draw() {
+	min := point{First: math.MaxInt, Second: math.MaxInt}
+	max := point{First: math.MinInt, Second: math.MinInt}
+	for p := range d.grid {
+		if p.First < min.First {
+			min.First = p.First
+		}
+		if p.First > max.First {
+			max.First = p.First
+		}
+		if p.Second < min.Second {
+			min.Second = p.Second
+		}
+		if p.Second > max.Second {
+			max.Second = p.Second
+		}
+	}
+
+	for x := min.First; x <= max.First; x++ {
+		for y := min.Second; y <= max.Second; y++ {
+			p := point{First: x, Second: y}
+			switch d.grid[p] {
+			case cellStatusGoal:
+				fmt.Printf("%s@%s", u.ColorBrightGreen, u.TextReset)
+			case cellStatusOpen:
+				if p == d.pos {
+					fmt.Print(u.BackgroundBrightRed)
+				} else if x == 0 && y == 0 {
+					fmt.Print(u.BackgroundYellow)
+				} else if u.ArrayContains(d.shortestPath, p) {
+					fmt.Print(u.BackgroundGreen)
+				} else if d.visited[p] != nil && d.visited[p].timesVisited > maxVisited {
+					fmt.Print(u.ColorYellow)
+					fmt.Print(u.BackgroundBlack)
+				} else if d.visited[p] != nil && d.visited[p].timesVisited > 1 {
+					fmt.Print(u.BackgroundMagenta)
+				} else {
+					fmt.Print(u.BackgroundBlue)
+				}
+				fmt.Printf(".%s", u.TextReset)
+			case cellStatusWall:
+				fmt.Print("█")
+			case cellStatusUnknown:
+				fmt.Print(" ")
+			}
+		}
+		fmt.Println()
+	}
+}
+
+func (d *Day15) markShortestPath() {
+	pos := d.goalPos
+	checkOffsets := []point{
+		{First: -1, Second: 0},
+		{First: 1, Second: 0},
+		{First: 0, Second: -1},
+		{First: 0, Second: 1},
+	}
+
+	checkPt := func(pt point) (bool, int) {
+		if v, exists := d.visited[pt]; exists && d.grid[pt] == cellStatusOpen {
+			return true, v.distanceFromStart
+		}
+		return false, math.MaxInt
+	}
+
+	d.shortestPath = []point{d.goalPos}
+
+	for pos.First != 0 || pos.Second != 0 {
+		lowestDist := math.MaxInt
+		lowestPoint := point{}
+		for _, pt := range checkOffsets {
+			newPt := point{First: pos.First + pt.First, Second: pos.Second + pt.Second}
+			if found, dist := checkPt(newPt); found && dist < lowestDist {
+				lowestDist = dist
+				lowestPoint = newPt
+			}
+		}
+
+		d.shortestPath = append(d.shortestPath, lowestPoint)
+		pos = lowestPoint
+	}
+}
+
+func (d *Day15) exploreFullMap() map[point]*visitedStatus {
+	grids := make([]map[point]cellStatus, 0, len(dirOrders))
+	goalVisited := d.visited
+
+	for _, dirOrder := range dirOrders {
+		d.program.Reset()
+
+		targetPos := point{}
+		nextDir := dirFirst
+		distFromStart := 0
+
+		d.pos = point{}
+		d.visited = map[point]*visitedStatus{
+			{First: 0, Second: 0}: {timesVisited: 1},
+		}
+		d.grid = map[point]cellStatus{
+			{First: 0, Second: 0}: cellStatusOpen,
+		}
+		d.program.RunIn(func(inputStep int) int64 {
+			var err error
+			nextDir, targetPos, err = d.getDirToNextCellType(d.pos, cellStatusUnknown, 0, dirOrder)
+			if err != nil {
+				// ensure we never try to go back into the trapped spot
+				d.visited[d.pos].timesVisited = maxVisited + 1
+				for x := 1; x <= maxVisited && err != nil; x++ {
+					nextDir, targetPos, err = d.getDirToNextCellType(d.pos, cellStatusOpen, x, dirOrder)
+				}
+			}
+			if err != nil {
+				// d.Draw()
+				// panic(err)
+				d.program.Stop()
+			}
+
+			return int64(nextDir)
+		}, func(val int64, state u.IntcodeProgramState) {
+			rVal := responseType(val)
+
+			p := d.getPointInDirection(d.pos, nextDir)
+			shouldMove := true
+			switch rVal {
+			case responseWall:
+				d.grid[p] = cellStatusWall
+				shouldMove = false
+			case responseSuccess:
+				d.grid[p] = cellStatusOpen
+			case responseFoundGoal:
+				d.grid[p] = cellStatusGoal
+			}
+
+			if shouldMove {
+				d.pos = targetPos
+				if d.visited[d.pos] == nil {
+					d.visited[d.pos] = &visitedStatus{}
+					distFromStart++
+				} else {
+					distFromStart--
+				}
+				d.visited[d.pos].timesVisited++
+				d.visited[d.pos].distanceFromStart = distFromStart
+			}
+
+			if rVal == responseFoundGoal {
+				// d.Draw()
+				d.goalPos = targetPos
+				goalVisited = d.visited
+			}
+		})
+
+		grids = append(grids, d.grid)
+	}
+
+	d.grid = map[point]cellStatus{
+		{First: 0, Second: 0}: cellStatusOpen,
+	}
+	for _, grid := range grids {
+		keys := u.MapKeys(grid)
+		for _, key := range keys {
+			d.grid[key] = grid[key]
+		}
+	}
+
+	return goalVisited
+}
+
+func (d *Day15) tagDistanceRecursive(pos, last point, dist int, distances map[point]int) {
+	distances[pos] = dist
+	for _, cell := range d.getAdjacentCellsOfType(pos, cellStatusOpen) {
+		if cell == last {
+			continue
+		}
+		d.tagDistanceRecursive(cell, pos, dist+1, distances)
+	}
+}
+
+func (d *Day15) Part1() string {
+	d.visited = d.exploreFullMap()
+	d.markShortestPath()
+
+	for _, visited := range d.visited {
+		visited.timesVisited = 1
+	}
+	d.pos = point{}
+	d.Draw()
+
+	return fmt.Sprintf("Moves required to reach target: %s%d%s", u.TextBold, d.visited[d.goalPos].distanceFromStart, u.TextReset)
+}
+
+func (d *Day15) Part2() string {
+	startLoc := d.goalPos
+	distanceMap := map[point]int{startLoc: 0}
+
+	d.tagDistanceRecursive(startLoc, point{}, 0, distanceMap)
+
+	cellDistances := u.MapValues(distanceMap)
+	sort.Slice(cellDistances, func(i, j int) bool { return cellDistances[i] > cellDistances[j] })
+
+	return fmt.Sprintf("Time to fill the area with oxygen: %s%d%s minutes", u.TextBold, cellDistances[0], u.TextReset)
+}

days/15_types_string.go

@@ -0,0 +1,66 @@
+// Code generated by "stringer -type=cellStatus,responseType,dirType -output=15_types_string.go"; DO NOT EDIT.
+
+package days
+
+import "strconv"
+
+func _() {
+	// An "invalid array index" compiler error signifies that the constant values have changed.
+	// Re-run the stringer command to generate them again.
+	var x [1]struct{}
+	_ = x[cellStatusUnknown-0]
+	_ = x[cellStatusWall-1]
+	_ = x[cellStatusOpen-2]
+	_ = x[cellStatusGoal-3]
+}
+
+const _cellStatus_name = "cellStatusUnknowncellStatusWallcellStatusOpencellStatusGoal"
+
+var _cellStatus_index = [...]uint8{0, 17, 31, 45, 59}
+
+func (i cellStatus) String() string {
+	if i < 0 || i >= cellStatus(len(_cellStatus_index)-1) {
+		return "cellStatus(" + strconv.FormatInt(int64(i), 10) + ")"
+	}
+	return _cellStatus_name[_cellStatus_index[i]:_cellStatus_index[i+1]]
+}
+func _() {
+	// An "invalid array index" compiler error signifies that the constant values have changed.
+	// Re-run the stringer command to generate them again.
+	var x [1]struct{}
+	_ = x[responseWall-0]
+	_ = x[responseSuccess-1]
+	_ = x[responseFoundGoal-2]
+}
+
+const _responseType_name = "responseWallresponseSuccessresponseFoundGoal"
+
+var _responseType_index = [...]uint8{0, 12, 27, 44}
+
+func (i responseType) String() string {
+	if i < 0 || i >= responseType(len(_responseType_index)-1) {
+		return "responseType(" + strconv.FormatInt(int64(i), 10) + ")"
+	}
+	return _responseType_name[_responseType_index[i]:_responseType_index[i+1]]
+}
+func _() {
+	// An "invalid array index" compiler error signifies that the constant values have changed.
+	// Re-run the stringer command to generate them again.
+	var x [1]struct{}
+	_ = x[dirNorth-1]
+	_ = x[dirSouth-2]
+	_ = x[dirWest-3]
+	_ = x[dirEast-4]
+}
+
+const _dirType_name = "dirNorthdirSouthdirWestdirEast"
+
+var _dirType_index = [...]uint8{0, 8, 16, 23, 30}
+
+func (i dirType) String() string {
+	i -= 1
+	if i < 0 || i >= dirType(len(_dirType_index)-1) {
+		return "dirType(" + strconv.FormatInt(int64(i+1), 10) + ")"
+	}
+	return _dirType_name[_dirType_index[i]:_dirType_index[i+1]]
+}

days/16.go

@@ -0,0 +1,104 @@
+package days
+
+import (
+	"fmt"
+	"math"
+
+	u "parnic.com/aoc2019/utilities"
+)
+
+type Day16 struct {
+	numberSet []int8
+}
+
+func (d *Day16) Parse() {
+	numberSequence := u.GetStringContents("16p")
+	d.numberSet = make([]int8, len(numberSequence))
+	for i, numRune := range numberSequence {
+		d.numberSet[i] = int8(numRune - '0')
+	}
+}
+
+func (d Day16) Num() int {
+	return 16
+}
+
+func (d *Day16) Part1() string {
+	transformed := make([]int8, len(d.numberSet))
+	copy(transformed, d.numberSet)
+
+	transformPattern := []int8{0, 1, 0, -1}
+
+	phases := 100
+	workingSet := make([]int8, len(transformed))
+	for i := 0; i < phases; i++ {
+		copy(workingSet, transformed)
+
+		// fmt.Printf("Phase %d. Input signal: %v\n", (i + 1), transformed)
+		for destIdx := range transformed {
+			repeated := 0
+			patternIdx := 0
+			workingVal := int64(0)
+			for idx := range transformed {
+				if repeated >= destIdx {
+					repeated = 0
+					patternIdx++
+					if patternIdx == len(transformPattern) {
+						patternIdx = 0
+					}
+				} else {
+					repeated++
+				}
+
+				// fmt.Printf("%d*%d", transformed[idx], transformPattern[patternIdx])
+				// if idx < len(transformed)-1 {
+				// 	fmt.Print(" + ")
+				// }
+				workingVal += int64(transformed[idx] * transformPattern[patternIdx])
+			}
+
+			workingSet[destIdx] = int8(int64(math.Abs(float64(workingVal))) % 10)
+			// fmt.Printf(" = %d\n", workingSet[destIdx])
+		}
+
+		copy(transformed, workingSet)
+	}
+
+	finalVal := 0
+	for i := range transformed[0:8] {
+		finalVal += int(transformed[i]) * int(math.Pow10(8-1-i))
+	}
+	return fmt.Sprintf("First 8 digits of the final output list: %s%d%s", u.TextBold, finalVal, u.TextReset)
+}
+
+func (d *Day16) Part2() string {
+	transformed := make([]int8, len(d.numberSet)*10000)
+	for i := 0; i < 10000; i++ {
+		copy(transformed[i*len(d.numberSet):(i*len(d.numberSet))+len(d.numberSet)], d.numberSet)
+	}
+
+	finalMsgOffset := 0
+	for i := 0; i < 7; i++ {
+		finalMsgOffset += int(d.numberSet[i]) * int(math.Pow10(7-1-i))
+	}
+
+	if finalMsgOffset < len(transformed)/2 {
+		panic("offset must be in the back half of the message for this solution to work")
+	}
+
+	phases := 100
+	for p := 0; p < phases; p++ {
+		rollingTotal := int8(0)
+		for i := len(transformed) - 1; i >= finalMsgOffset; i-- {
+			rollingTotal += transformed[i]
+			rollingTotal = rollingTotal % 10
+			transformed[i] = rollingTotal
+		}
+	}
+
+	finalVal := 0
+	for i := range transformed[finalMsgOffset : finalMsgOffset+8] {
+		finalVal += int(transformed[finalMsgOffset+i]) * int(math.Pow10(8-1-i))
+	}
+	return fmt.Sprintf("Embedded message in the final output list: %s%d%s", u.TextBold, finalVal, u.TextReset)
+}

days/17.go

@@ -0,0 +1,422 @@
+package days
+
+import (
+	"fmt"
+	"strings"
+
+	u "parnic.com/aoc2019/utilities"
+)
+
+type camViewCellType int
+type botFacing int
+type day17Grid [][]camViewCellType
+
+const (
+	cellTypeScaffold camViewCellType = iota
+	cellTypeOpen
+	cellTypeInvalid
+)
+
+const (
+	botFacingUp botFacing = iota
+	botFacingLeft
+	botFacingDown
+	botFacingRight
+
+	botFacingFirst = botFacingUp
+	botFacingLast  = botFacingRight
+)
+
+const (
+	dirLeft                 = 1
+	dirRight                = -1
+	maxInstructionSetLength = 20
+)
+
+var (
+	day17AdjacentOffsets = []u.Vec2i{
+		{X: -1, Y: 0},
+		{X: 1, Y: 0},
+		{X: 0, Y: -1},
+		{X: 0, Y: 1},
+	}
+)
+
+type Day17 struct {
+	program u.IntcodeProgram
+}
+
+func (d *Day17) Parse() {
+	d.program = u.LoadIntcodeProgram("17p")
+}
+
+func (d Day17) Num() int {
+	return 17
+}
+
+func (currentDir botFacing) getNewFacingDir(turnDir int) botFacing {
+	currentDir += botFacing(turnDir)
+	if currentDir < botFacingFirst {
+		currentDir = botFacingLast
+	} else if currentDir > botFacingLast {
+		currentDir = botFacingFirst
+	}
+
+	return currentDir
+}
+
+func (grid day17Grid) Draw(botLocation u.Vec2i, botFacingDir botFacing, endLocation u.Vec2i) {
+	for y := range grid {
+		for x := range grid[y] {
+			switch grid[y][x] {
+			case cellTypeOpen:
+				fmt.Print(" ")
+			case cellTypeScaffold:
+				char := "█"
+				color := u.ColorBlack
+				if botLocation.X == x && botLocation.Y == y {
+					switch botFacingDir {
+					case botFacingUp:
+						char = "^"
+					case botFacingLeft:
+						char = "<"
+					case botFacingDown:
+						char = "v"
+					case botFacingRight:
+						char = ">"
+					}
+				} else if endLocation.X == x && endLocation.Y == y {
+					char = "@"
+				} else {
+					color = u.ColorWhite
+				}
+				fmt.Printf("%s%s%s%s", u.BackgroundWhite, color, char, u.TextReset)
+			}
+		}
+		fmt.Println()
+	}
+}
+
+func (grid day17Grid) getAdjacentScaffolds(y, x int) []u.Vec2i {
+	retval := make([]u.Vec2i, 0)
+	for _, offset := range day17AdjacentOffsets {
+		offY := y + offset.Y
+		offX := x + offset.X
+		if offY < 0 || offY >= len(grid) ||
+			offX < 0 || offX >= len(grid[0]) {
+			continue
+		}
+
+		if grid[offY][offX] == cellTypeScaffold {
+			retval = append(retval, u.Vec2i{X: offX, Y: offY})
+		}
+	}
+
+	return retval
+}
+
+func (grid day17Grid) forEachCellOfType(t camViewCellType, f func(y, x int)) {
+	for y := range grid {
+		for x := range grid[y] {
+			if grid[y][x] == t {
+				f(y, x)
+			}
+		}
+	}
+}
+
+func (grid *day17Grid) processGridUpdate(y int, rVal rune, currBotLocation u.Vec2i, currBotFacing botFacing) (int, u.Vec2i, botFacing) {
+	grid.appendValue(rVal, y)
+
+	switch rVal {
+	case '\n':
+		y++
+	case '^', '<', 'v', '>':
+		currBotLocation = u.Vec2i{X: len((*grid)[y]) - 1, Y: y}
+		switch rVal {
+		case '^':
+			currBotFacing = botFacingUp
+		case '<':
+			currBotFacing = botFacingLeft
+		case 'v':
+			currBotFacing = botFacingDown
+		case '>':
+			currBotFacing = botFacingRight
+		}
+	}
+
+	return y, currBotLocation, currBotFacing
+}
+
+func (grid day17Grid) getCellTypeInDirection(y, x int, facingDir botFacing) (camViewCellType, int, int) {
+	newX := x
+	newY := y
+	switch facingDir {
+	case botFacingUp:
+		newY--
+	case botFacingLeft:
+		newX--
+	case botFacingDown:
+		newY++
+	case botFacingRight:
+		newX++
+	}
+
+	if newY < 0 || newY >= len(grid) || newX < 0 || newX >= len(grid[0]) {
+		return cellTypeInvalid, newY, newX
+	}
+
+	return grid[newY][newX], newY, newX
+}
+
+func (grid *day17Grid) appendValue(rVal rune, row int) {
+	ensureCapacity := func(y int) {
+		for len(*grid) <= y {
+			*grid = append(*grid, make([]camViewCellType, 0))
+		}
+	}
+
+	switch rVal {
+	case '#':
+		ensureCapacity(row)
+		(*grid)[row] = append((*grid)[row], cellTypeScaffold)
+	case '.':
+		ensureCapacity(row)
+		(*grid)[row] = append((*grid)[row], cellTypeOpen)
+	case '^', '<', 'v', '>':
+		ensureCapacity(row)
+		(*grid)[row] = append((*grid)[row], cellTypeScaffold)
+	}
+}
+
+func (grid day17Grid) findEndLocation(botLocation u.Vec2i) u.Vec2i {
+	var endLocation u.Vec2i
+	grid.forEachCellOfType(cellTypeScaffold, func(y, x int) {
+		if numSurrounding := len(grid.getAdjacentScaffolds(y, x)); numSurrounding == 1 {
+			if botLocation.X != x || botLocation.Y != y {
+				endLocation = u.Vec2i{X: x, Y: y}
+			}
+		}
+	})
+
+	return endLocation
+}
+
+func (grid day17Grid) getTurnDirectionFromCorner(pos u.Vec2i, botFacingDir botFacing) (int, string) {
+	adj := grid.getAdjacentScaffolds(pos.Y, pos.X)
+	turnDirection := 0
+	// this is so awful. i'm sure there's a better way, but i'm tired.
+	if botFacingDir == botFacingUp || botFacingDir == botFacingDown {
+		if u.ArrayContains(adj, u.Vec2i{X: pos.X - 1, Y: pos.Y}) {
+			if botFacingDir == botFacingUp {
+				turnDirection = dirLeft
+			} else if botFacingDir == botFacingDown {
+				turnDirection = dirRight
+			}
+		} else if u.ArrayContains(adj, u.Vec2i{X: pos.X + 1, Y: pos.Y}) {
+			if botFacingDir == botFacingUp {
+				turnDirection = dirRight
+			} else if botFacingDir == botFacingDown {
+				turnDirection = dirLeft
+			}
+		}
+	} else {
+		if u.ArrayContains(adj, u.Vec2i{X: pos.X, Y: pos.Y - 1}) {
+			if botFacingDir == botFacingLeft {
+				turnDirection = dirRight
+			} else if botFacingDir == botFacingRight {
+				turnDirection = dirLeft
+			}
+		} else if u.ArrayContains(adj, u.Vec2i{X: pos.X, Y: pos.Y + 1}) {
+			if botFacingDir == botFacingLeft {
+				turnDirection = dirLeft
+			} else if botFacingDir == botFacingRight {
+				turnDirection = dirRight
+			}
+		}
+	}
+
+	dirAscii := "L"
+	if turnDirection == dirRight {
+		dirAscii = "R"
+	}
+
+	return turnDirection, dirAscii
+}
+
+func buildInstructionString(instructions []string) string {
+	workingInstructions := make([]string, len(instructions))
+	copy(workingInstructions, instructions)
+
+	minimumRecurrence := 3
+	initialInstructionSubsetLen := 4
+
+	instructionStr := strings.Join(workingInstructions, ",")
+	progs := make([][]string, 3)
+	for i := range progs {
+		numFound := minimumRecurrence
+		subLen := initialInstructionSubsetLen
+		for numFound >= minimumRecurrence {
+			numFound = 1
+			instructionSubset := strings.Join(workingInstructions[0:subLen], ",")
+			if len(instructionSubset) > maxInstructionSetLength {
+				break
+			}
+			for x := len(instructionSubset); x <= len(instructionStr)-len(instructionSubset); x++ {
+				if instructionStr[x:x+len(instructionSubset)] == instructionSubset {
+					numFound++
+					x += len(instructionSubset)
+				}
+			}
+			if numFound >= minimumRecurrence {
+				subLen += 2
+			}
+		}
+		if numFound < minimumRecurrence {
+			subLen -= 2
+		}
+		progs[i] = make([]string, subLen)
+		copy(progs[i], workingInstructions[0:subLen])
+
+		instructionStr = strings.ReplaceAll(instructionStr, strings.Join(progs[i], ","), "")
+		instructionStr = strings.TrimPrefix(strings.ReplaceAll(instructionStr, ",,", ","), ",")
+
+		if len(instructionStr) == 0 {
+			workingInstructions = nil
+		} else {
+			workingInstructions = strings.Split(instructionStr, ",")
+		}
+	}
+
+	if workingInstructions != nil {
+		panic("failed to use up all instructions")
+	}
+
+	programStr := strings.Join(instructions, ",")
+	for i := range progs {
+		programStr = strings.ReplaceAll(programStr, strings.Join(progs[i], ","), fmt.Sprintf("%c", 'A'+i))
+	}
+
+	sb := strings.Builder{}
+	sb.WriteString(programStr)
+	sb.WriteRune('\n')
+
+	for i := range progs {
+		sb.WriteString(strings.Join(progs[i], ","))
+		sb.WriteRune('\n')
+	}
+
+	runDebug := 'n'
+	sb.WriteRune(runDebug)
+	sb.WriteRune('\n')
+
+	return sb.String()
+}
+
+func (grid day17Grid) solvePath(botLocation u.Vec2i, botFacingDir botFacing) string {
+	instructions := make([]string, 0)
+
+	pos := botLocation
+	endLocation := grid.findEndLocation(botLocation)
+	for {
+		if pos == endLocation {
+			break
+		}
+
+		turnDirection, dirAscii := grid.getTurnDirectionFromCorner(pos, botFacingDir)
+		if turnDirection == 0 {
+			panic("at an invalid location somehow")
+		}
+
+		instructions = append(instructions, dirAscii)
+
+		botFacingDir = botFacingDir.getNewFacingDir(turnDirection)
+		numMoved := 0
+		for {
+			cell, newY, newX := grid.getCellTypeInDirection(pos.Y, pos.X, botFacingDir)
+			if cell != cellTypeScaffold {
+				break
+			}
+			pos.X = newX
+			pos.Y = newY
+			numMoved++
+		}
+		instructions = append(instructions, fmt.Sprintf("%d", numMoved))
+	}
+
+	return buildInstructionString(instructions)
+}
+
+func (d *Day17) Part1() string {
+	grid := day17Grid{}
+	y := 0
+	var botLocation u.Vec2i
+	var botFacingDir botFacing
+
+	d.program.RunIn(func(inputStep int) int64 {
+		return 0
+	}, func(val int64, state u.IntcodeProgramState) {
+		rVal := rune(val)
+		y, botLocation, botFacingDir = grid.processGridUpdate(y, rVal, botLocation, botFacingDir)
+	})
+
+	alignmentParameterTotal := 0
+	grid.forEachCellOfType(cellTypeScaffold, func(y, x int) {
+		if numSurrounding := len(grid.getAdjacentScaffolds(y, x)); numSurrounding == 4 {
+			alignmentParameterTotal += y * x
+		}
+	})
+
+	// endLocation := grid.findEndLocation(botLocation)
+	// grid.Draw(botLocation, botFacingDir, endLocation)
+
+	return fmt.Sprintf("Alignment parameter sum: %s%d%s", u.TextBold, alignmentParameterTotal, u.TextReset)
+}
+
+func (d *Day17) Part2() string {
+	beforeGrid := day17Grid{}
+	var beforeBotLocation u.Vec2i
+	var beforeBotFacing botFacing
+
+	afterGrid := day17Grid{}
+	var afterBotLocation u.Vec2i
+	var afterBotFacing botFacing
+
+	d.program.Reset()
+	d.program.SetMemory(0, 2)
+
+	row := 0
+	var outputState int
+	var lastOutput int64
+	var instructionStr string
+	d.program.RunIn(func(inputStep int) int64 {
+		return int64(instructionStr[inputStep-1])
+	}, func(val int64, state u.IntcodeProgramState) {
+		rVal := rune(val)
+		if outputState == 0 {
+			row, beforeBotLocation, beforeBotFacing = beforeGrid.processGridUpdate(row, rVal, beforeBotLocation, beforeBotFacing)
+		} else if outputState == 2 {
+			row, afterBotLocation, afterBotFacing = afterGrid.processGridUpdate(row, rVal, afterBotLocation, afterBotFacing)
+		}
+
+		if rVal == '\n' && lastOutput == '\n' {
+			if outputState == 0 {
+				instructionStr = beforeGrid.solvePath(beforeBotLocation, beforeBotFacing)
+			}
+			outputState++
+			row = 0
+		}
+
+		lastOutput = val
+	})
+
+	// fmt.Println("initial grid:")
+	// beforeEndLocation := beforeGrid.findEndLocation(beforeBotLocation)
+	// beforeGrid.Draw(beforeBotLocation, beforeBotFacing, beforeEndLocation)
+
+	// fmt.Println("completed grid:")
+	// afterEndLocation := afterGrid.findEndLocation(afterBotLocation)
+	// afterGrid.Draw(afterBotLocation, afterBotFacing, afterEndLocation)
+
+	return fmt.Sprintf("Dust collected after traveling all paths: %s%d%s", u.TextBold, lastOutput, u.TextReset)
+}

days/18.go

@@ -0,0 +1,345 @@
+package days
+
+import (
+	"container/heap"
+	"fmt"
+	"math"
+	"strings"
+
+	"github.com/edwingeng/deque/v2"
+	u "parnic.com/aoc2019/utilities"
+)
+
+type day18Cell int
+type day18Vec u.Vec2[int]
+type day18Graph map[rune][]u.Pair[rune, int]
+
+const (
+	day18CellWall day18Cell = iota
+	day18CellOpen
+)
+
+var (
+	day18AdjacentOffsets = []day18Vec{
+		{X: -1, Y: 0},
+		{X: 1, Y: 0},
+		{X: 0, Y: -1},
+		{X: 0, Y: 1},
+	}
+)
+
+type Day18 struct {
+	entrance day18Vec
+	grid     [][]day18Cell
+	doors    map[day18Vec]int
+	keys     map[day18Vec]int
+}
+
+func (d *Day18) Parse() {
+	d.doors = make(map[day18Vec]int)
+	d.keys = make(map[day18Vec]int)
+
+	lines := u.GetStringLines("18p")
+	d.grid = make([][]day18Cell, len(lines))
+	for i, line := range lines {
+		d.grid[i] = make([]day18Cell, len(line))
+		for j, char := range line {
+			if char == '#' {
+				d.grid[i][j] = day18CellWall
+			} else if char == '.' {
+				d.grid[i][j] = day18CellOpen
+			} else if char == '@' {
+				d.grid[i][j] = day18CellOpen
+				d.entrance = day18Vec{X: j, Y: i}
+			} else if char >= 'A' && char <= 'Z' {
+				d.grid[i][j] = day18CellOpen
+				d.doors[day18Vec{X: j, Y: i}] = int(char - 'A')
+			} else if char >= 'a' && char <= 'z' {
+				d.grid[i][j] = day18CellOpen
+				d.keys[day18Vec{X: j, Y: i}] = int(char - 'a')
+			}
+		}
+	}
+}
+
+func (d Day18) Num() int {
+	return 18
+}
+
+func (d Day18) Draw(grid [][]day18Cell, keys, doors map[day18Vec]int, entrances ...day18Vec) {
+	for y := range grid {
+		for x := range grid[y] {
+			switch grid[y][x] {
+			case day18CellWall:
+				fmt.Print("█")
+			case day18CellOpen:
+				posVec := day18Vec{X: x, Y: y}
+				if _, exists := doors[posVec]; exists {
+					fmt.Printf("%c", rune(doors[posVec]+'A'))
+				} else if _, exists := keys[posVec]; exists {
+					fmt.Printf("%c", rune(keys[posVec]+'a'))
+				} else if u.ArrayContains(entrances, posVec) {
+					fmt.Print("@")
+				} else {
+					fmt.Print(".")
+				}
+			}
+		}
+		fmt.Println()
+	}
+}
+
+func (d Day18) findAdjacentCells(inPos day18Vec, keys, doors map[day18Vec]int, grid [][]day18Cell) []u.Pair[rune, int] {
+	found := make([]u.Pair[rune, int], 0)
+
+	getAdjacent := func(pos day18Vec) []day18Vec {
+		retAdjacent := make([]day18Vec, 0, len(day18AdjacentOffsets))
+		for _, off := range day18AdjacentOffsets {
+			offVec := day18Vec{X: pos.X + off.X, Y: pos.Y + off.Y}
+			if grid[offVec.Y][offVec.X] == day18CellWall {
+				continue
+			}
+			retAdjacent = append(retAdjacent, offVec)
+		}
+
+		return retAdjacent
+	}
+
+	queue := deque.NewDeque[u.Pair[int, day18Vec]]()
+	visited := make(map[day18Vec]bool)
+	for _, adjacent := range getAdjacent(inPos) {
+		queue.PushBack(u.Pair[int, day18Vec]{First: 1, Second: adjacent})
+	}
+
+	for !queue.IsEmpty() {
+		next := queue.PopFront()
+
+		if _, exists := visited[next.Second]; !exists {
+			visited[next.Second] = true
+
+			key, adjacentIsKey := keys[next.Second]
+			door, adjacentIsDoor := doors[next.Second]
+			if adjacentIsKey || adjacentIsDoor {
+				var rVal rune
+				if adjacentIsKey {
+					rVal = rune('a' + key)
+				} else if adjacentIsDoor {
+					rVal = rune('A' + door)
+				}
+
+				alreadyFound := false
+				for _, p := range found {
+					if p.First == rVal {
+						alreadyFound = true
+						break
+					}
+				}
+				if !alreadyFound {
+					found = append(found, u.Pair[rune, int]{First: rVal, Second: next.First})
+					continue
+				}
+			}
+
+			for _, neighbor := range getAdjacent(next.Second) {
+				if _, exists := visited[neighbor]; !exists {
+					queue.PushBack(u.Pair[int, day18Vec]{First: next.First + 1, Second: neighbor})
+				}
+			}
+		}
+	}
+
+	return found
+}
+
+type day18PriorityQueue struct {
+	distance int
+	neighbor rune
+}
+type PriorityQueueHeap []day18PriorityQueue
+
+func (h PriorityQueueHeap) Len() int           { return len(h) }
+func (h PriorityQueueHeap) Less(i, j int) bool { return h[i].distance < h[j].distance }
+func (h PriorityQueueHeap) Swap(i, j int)      { h[i], h[j] = h[j], h[i] }
+
+func (h *PriorityQueueHeap) Push(x any) {
+	*h = append(*h, x.(day18PriorityQueue))
+}
+
+func (h *PriorityQueueHeap) Pop() any {
+	old := *h
+	n := len(old)
+	x := old[n-1]
+	*h = old[0 : n-1]
+	return x
+}
+
+type reachableKeysMemo struct {
+	pos       rune
+	keysFound int
+}
+
+var knownReachableKeys = make(map[reachableKeysMemo][]u.Pair[rune, int])
+
+func (d Day18) reachableKeys(inPos rune, keysFound int, graph day18Graph) []u.Pair[rune, int] {
+	memo := reachableKeysMemo{
+		pos:       inPos,
+		keysFound: keysFound,
+	}
+	if v, exists := knownReachableKeys[memo]; exists {
+		return v
+	}
+
+	ret := make([]u.Pair[rune, int], 0)
+	distance := make(map[rune]int)
+
+	ih := make(PriorityQueueHeap, 0)
+
+	for _, p := range graph[inPos] {
+		ih = append(ih, day18PriorityQueue{
+			distance: p.Second,
+			neighbor: p.First,
+		})
+	}
+
+	heap.Init(&ih)
+
+	for ih.Len() > 0 {
+		node := heap.Pop(&ih).(day18PriorityQueue)
+
+		// it's a key and we haven't picked it up yet...
+		if node.neighbor >= 'a' && node.neighbor <= 'z' && (1<<int(node.neighbor-'a')&keysFound) == 0 {
+			ret = append(ret, u.Pair[rune, int]{First: node.neighbor, Second: node.distance})
+			continue
+		}
+
+		// it's a door but we don't have the key yet...
+		if node.neighbor >= 'A' && node.neighbor <= 'Z' && ((1<<int(node.neighbor-'A'))&keysFound) == 0 {
+			continue
+		}
+
+		for _, p := range graph[node.neighbor] {
+			newDistance := node.distance + p.Second
+			if dist, exists := distance[p.First]; !exists || newDistance < dist {
+				distance[p.First] = newDistance
+				heap.Push(&ih, day18PriorityQueue{
+					distance: newDistance,
+					neighbor: p.First,
+				})
+			}
+		}
+	}
+
+	knownReachableKeys[memo] = ret
+	return ret
+}
+
+type minStepsMemo struct {
+	pos        string
+	keysToFind int
+	keysFound  int
+}
+
+var knownMinimumSteps = make(map[minStepsMemo]int, 0)
+
+func (d Day18) minimumSteps(inPos string, keysToFind int, keysFound int, graph day18Graph) int {
+	memo := minStepsMemo{
+		pos:        inPos,
+		keysToFind: keysToFind,
+		keysFound:  keysFound,
+	}
+	if v, exists := knownMinimumSteps[memo]; exists {
+		return v
+	}
+
+	if keysToFind == 0 {
+		return 0
+	}
+
+	best := math.Inf(1)
+	for _, item := range inPos {
+		for _, p := range d.reachableKeys(item, keysFound, graph) {
+			sb := strings.Builder{}
+			oldIdx := strings.IndexRune(inPos, item)
+			for i := range inPos {
+				if i == oldIdx {
+					sb.WriteRune(p.First)
+				} else {
+					sb.WriteByte(inPos[i])
+				}
+			}
+			newKeys := keysFound + (1 << (p.First - 'a'))
+			dist := p.Second
+
+			dist += d.minimumSteps(sb.String(), keysToFind-1, newKeys, graph)
+
+			if float64(dist) < best {
+				best = float64(dist)
+			}
+		}
+	}
+
+	knownMinimumSteps[memo] = int(best)
+	return int(best)
+}
+
+func (d Day18) buildGraph(pos []day18Vec, keys map[day18Vec]int, doors map[day18Vec]int, grid [][]day18Cell) day18Graph {
+	graph := make(day18Graph)
+	for i, p := range pos {
+		adjacent := d.findAdjacentCells(p, keys, doors, grid)
+		graph[rune('1'+i)] = adjacent
+	}
+	for keyPos, keyType := range keys {
+		graph[rune('a'+keyType)] = d.findAdjacentCells(keyPos, keys, doors, grid)
+	}
+	for doorPos, doorType := range doors {
+		graph[rune('A'+doorType)] = d.findAdjacentCells(doorPos, keys, doors, grid)
+	}
+
+	return graph
+}
+
+func (d Day18) part2PatchMap(grid [][]day18Cell, entrance day18Vec) []day18Vec {
+	grid[entrance.Y-1][entrance.X] = day18CellWall
+	grid[entrance.Y][entrance.X-1] = day18CellWall
+	grid[entrance.Y][entrance.X] = day18CellWall
+	grid[entrance.Y][entrance.X+1] = day18CellWall
+	grid[entrance.Y+1][entrance.X] = day18CellWall
+
+	return []day18Vec{
+		{X: entrance.X - 1, Y: entrance.Y - 1},
+		{X: entrance.X + 1, Y: entrance.Y - 1},
+		{X: entrance.X - 1, Y: entrance.Y + 1},
+		{X: entrance.X + 1, Y: entrance.Y + 1},
+	}
+}
+
+func (d *Day18) Part1() string {
+	// fmt.Println("initial state:")
+	// d.Draw(d.grid, d.keys, d.doors, d.entrance)
+
+	graph := d.buildGraph([]day18Vec{d.entrance}, d.keys, d.doors, d.grid)
+	minSteps := d.minimumSteps("1", len(d.keys), 0, graph)
+
+	return fmt.Sprintf("Total distance traveled: %s%d%s", u.TextBold, minSteps, u.TextReset)
+}
+
+func (d *Day18) Part2() string {
+	// fmt.Println("initial state:")
+	grid := make([][]day18Cell, len(d.grid))
+	for i := range d.grid {
+		grid[i] = make([]day18Cell, len(d.grid[i]))
+		copy(grid[i], d.grid[i])
+	}
+
+	entrances := d.part2PatchMap(grid, d.entrance)
+	// d.Draw(grid, d.keys, d.doors, entrances...)
+
+	// clear memoized maps that (might have) came from part1
+	knownMinimumSteps = make(map[minStepsMemo]int)
+	knownReachableKeys = make(map[reachableKeysMemo][]u.Pair[rune, int])
+
+	graph := d.buildGraph(entrances, d.keys, d.doors, grid)
+	minSteps := d.minimumSteps("1234", len(d.keys), 0, graph)
+
+	return fmt.Sprintf("Total distance traveled: %s%d%s", u.TextBold, minSteps, u.TextReset)
+}

go.mod

@@ -1,3 +1,5 @@
 module parnic.com/aoc2019
 
 go 1.18
+
+require github.com/edwingeng/deque/v2 v2.0.1

go.sum

@@ -0,0 +1,2 @@
+github.com/edwingeng/deque/v2 v2.0.1 h1:yNEsA9tUImO0vyw2hmVGiK4nnkoxBQ8stMYpdVq2ZmQ=
+github.com/edwingeng/deque/v2 v2.0.1/go.mod h1:HukI8CQe9KDmZCcURPZRYVYjH79Zy2tIjTF9sN3Bgb0=

inputs/06s1.txt

@@ -0,0 +1,11 @@
+COM)B
+B)C
+C)D
+D)E
+E)F
+B)G
+G)H
+D)I
+E)J
+J)K
+K)L

inputs/06s2.txt

@@ -0,0 +1,13 @@
+COM)B
+B)C
+C)D
+D)E
+E)F
+B)G
+G)H
+D)I
+E)J
+J)K
+K)L
+K)YOU
+I)SAN

inputs/07p.txt

@@ -0,0 +1 @@
+3,8,1001,8,10,8,105,1,0,0,21,38,47,64,85,106,187,268,349,430,99999,3,9,1002,9,4,9,1001,9,4,9,1002,9,4,9,4,9,99,3,9,1002,9,4,9,4,9,99,3,9,1001,9,3,9,102,5,9,9,1001,9,5,9,4,9,99,3,9,101,3,9,9,102,5,9,9,1001,9,4,9,102,4,9,9,4,9,99,3,9,1002,9,3,9,101,2,9,9,102,4,9,9,101,2,9,9,4,9,99,3,9,1002,9,2,9,4,9,3,9,102,2,9,9,4,9,3,9,1001,9,2,9,4,9,3,9,1001,9,1,9,4,9,3,9,101,1,9,9,4,9,3,9,102,2,9,9,4,9,3,9,101,2,9,9,4,9,3,9,102,2,9,9,4,9,3,9,1002,9,2,9,4,9,3,9,1002,9,2,9,4,9,99,3,9,102,2,9,9,4,9,3,9,1002,9,2,9,4,9,3,9,1001,9,1,9,4,9,3,9,1002,9,2,9,4,9,3,9,101,1,9,9,4,9,3,9,1002,9,2,9,4,9,3,9,1001,9,2,9,4,9,3,9,1001,9,1,9,4,9,3,9,101,2,9,9,4,9,3,9,101,1,9,9,4,9,99,3,9,102,2,9,9,4,9,3,9,102,2,9,9,4,9,3,9,1001,9,1,9,4,9,3,9,1002,9,2,9,4,9,3,9,102,2,9,9,4,9,3,9,1002,9,2,9,4,9,3,9,101,1,9,9,4,9,3,9,101,1,9,9,4,9,3,9,101,1,9,9,4,9,3,9,1002,9,2,9,4,9,99,3,9,1002,9,2,9,4,9,3,9,102,2,9,9,4,9,3,9,101,1,9,9,4,9,3,9,1001,9,1,9,4,9,3,9,1002,9,2,9,4,9,3,9,102,2,9,9,4,9,3,9,102,2,9,9,4,9,3,9,101,2,9,9,4,9,3,9,102,2,9,9,4,9,3,9,1002,9,2,9,4,9,99,3,9,1002,9,2,9,4,9,3,9,101,1,9,9,4,9,3,9,102,2,9,9,4,9,3,9,1001,9,2,9,4,9,3,9,1002,9,2,9,4,9,3,9,1002,9,2,9,4,9,3,9,1001,9,1,9,4,9,3,9,1002,9,2,9,4,9,3,9,1001,9,1,9,4,9,3,9,102,2,9,9,4,9,99

inputs/07s1.txt

@@ -0,0 +1 @@
+3,15,3,16,1002,16,10,16,1,16,15,15,4,15,99,0,0

inputs/07s2.txt

@@ -0,0 +1 @@
+3,23,3,24,1002,24,10,24,1002,23,-1,23,101,5,23,23,1,24,23,23,4,23,99,0,0

inputs/07s3.txt

@@ -0,0 +1 @@
+3,31,3,32,1002,32,10,32,1001,31,-2,31,1007,31,0,33,1002,33,7,33,1,33,31,31,1,32,31,31,4,31,99,0,0,0

inputs/07s4.txt

@@ -0,0 +1 @@
+3,26,1001,26,-4,26,3,27,1002,27,2,27,1,27,26,27,4,27,1001,28,-1,28,1005,28,6,99,0,0,5

inputs/07s5.txt

@@ -0,0 +1 @@
+3,52,1001,52,-5,52,3,53,1,52,56,54,1007,54,5,55,1005,55,26,1001,54,-5,54,1105,1,12,1,53,54,53,1008,54,0,55,1001,55,1,55,2,53,55,53,4,53,1001,56,-1,56,1005,56,6,99,0,0,0,0,10

inputs/08s1.txt

@@ -0,0 +1 @@
+123456789012

inputs/09p.txt

@@ -0,0 +1 @@
+1102,34463338,34463338,63,1007,63,34463338,63,1005,63,53,1101,3,0,1000,109,988,209,12,9,1000,209,6,209,3,203,0,1008,1000,1,63,1005,63,65,1008,1000,2,63,1005,63,904,1008,1000,0,63,1005,63,58,4,25,104,0,99,4,0,104,0,99,4,17,104,0,99,0,0,1102,1,31,1018,1102,352,1,1023,1101,0,1,1021,1101,0,33,1003,1102,1,36,1007,1102,21,1,1005,1101,359,0,1022,1101,0,787,1024,1102,1,24,1011,1101,30,0,1014,1101,22,0,1016,1101,0,0,1020,1102,1,29,1000,1101,778,0,1025,1102,23,1,1017,1102,1,28,1002,1101,38,0,1019,1102,1,27,1013,1102,1,32,1012,1101,0,37,1006,1101,444,0,1027,1102,1,20,1009,1101,0,447,1026,1101,0,39,1008,1101,35,0,1010,1102,559,1,1028,1102,26,1,1004,1102,1,25,1015,1102,1,34,1001,1101,0,554,1029,109,-3,2101,0,9,63,1008,63,34,63,1005,63,205,1001,64,1,64,1105,1,207,4,187,1002,64,2,64,109,23,21107,40,39,-7,1005,1013,227,1001,64,1,64,1106,0,229,4,213,1002,64,2,64,109,-17,1202,-2,1,63,1008,63,36,63,1005,63,249,1106,0,255,4,235,1001,64,1,64,1002,64,2,64,109,-6,1202,10,1,63,1008,63,36,63,1005,63,277,4,261,1106,0,281,1001,64,1,64,1002,64,2,64,109,-2,1208,9,26,63,1005,63,303,4,287,1001,64,1,64,1106,0,303,1002,64,2,64,109,32,1206,-7,321,4,309,1001,64,1,64,1106,0,321,1002,64,2,64,109,-29,1207,7,20,63,1005,63,337,1105,1,343,4,327,1001,64,1,64,1002,64,2,64,109,27,2105,1,-2,1001,64,1,64,1106,0,361,4,349,1002,64,2,64,109,-25,2108,39,7,63,1005,63,377,1106,0,383,4,367,1001,64,1,64,1002,64,2,64,109,1,1201,6,0,63,1008,63,36,63,1005,63,409,4,389,1001,64,1,64,1105,1,409,1002,64,2,64,109,1,2102,1,1,63,1008,63,33,63,1005,63,435,4,415,1001,64,1,64,1105,1,435,1002,64,2,64,109,28,2106,0,-3,1106,0,453,4,441,1001,64,1,64,1002,64,2,64,109,-13,21101,41,0,1,1008,1018,44,63,1005,63,477,1001,64,1,64,1106,0,479,4,459,1002,64,2,64,109,4,21108,42,42,-2,1005,1019,501,4,485,1001,64,1,64,1106,0,501,1002,64,2,64,109,-21,2101,0,2,63,1008,63,28,63,1005,63,523,4,507,1105,1,527,1001,64,1,64,1002,64,2,64,109,26,1205,-5,545,4,533,1001,64,1,64,1105,1,545,1002,64,2,64,109,3,2106,0,-1,4,551,1106,0,563,1001,64,1,64,1002,64,2,64,109,-33,1201,4,0,63,1008,63,28,63,1005,63,583,1105,1,589,4,569,1001,64,1,64,1002,64,2,64,109,11,2107,27,-3,63,1005,63,609,1001,64,1,64,1106,0,611,4,595,1002,64,2,64,109,8,21102,43,1,3,1008,1018,43,63,1005,63,637,4,617,1001,64,1,64,1105,1,637,1002,64,2,64,109,-5,21108,44,41,0,1005,1010,653,1105,1,659,4,643,1001,64,1,64,1002,64,2,64,109,-13,2108,21,8,63,1005,63,681,4,665,1001,64,1,64,1106,0,681,1002,64,2,64,109,6,1207,0,34,63,1005,63,703,4,687,1001,64,1,64,1105,1,703,1002,64,2,64,109,7,1208,-7,35,63,1005,63,723,1001,64,1,64,1106,0,725,4,709,1002,64,2,64,109,-13,2102,1,7,63,1008,63,23,63,1005,63,745,1105,1,751,4,731,1001,64,1,64,1002,64,2,64,109,13,1205,10,767,1001,64,1,64,1105,1,769,4,757,1002,64,2,64,109,14,2105,1,0,4,775,1001,64,1,64,1106,0,787,1002,64,2,64,109,-20,21107,45,46,7,1005,1011,809,4,793,1001,64,1,64,1105,1,809,1002,64,2,64,109,-3,2107,25,3,63,1005,63,827,4,815,1106,0,831,1001,64,1,64,1002,64,2,64,109,13,1206,7,847,1001,64,1,64,1106,0,849,4,837,1002,64,2,64,109,-11,21101,46,0,7,1008,1010,46,63,1005,63,871,4,855,1106,0,875,1001,64,1,64,1002,64,2,64,109,15,21102,47,1,-4,1008,1014,48,63,1005,63,895,1106,0,901,4,881,1001,64,1,64,4,64,99,21102,27,1,1,21101,0,915,0,1106,0,922,21201,1,63208,1,204,1,99,109,3,1207,-2,3,63,1005,63,964,21201,-2,-1,1,21102,1,942,0,1106,0,922,21202,1,1,-1,21201,-2,-3,1,21101,957,0,0,1105,1,922,22201,1,-1,-2,1106,0,968,21201,-2,0,-2,109,-3,2106,0,0

inputs/09s1.txt

@@ -0,0 +1 @@
+109,1,204,-1,1001,100,1,100,1008,100,16,101,1006,101,0,99

inputs/09s2.txt

@@ -0,0 +1 @@
+1102,34915192,34915192,7,4,7,99,0

inputs/09s3.txt

@@ -0,0 +1 @@
+104,1125899906842624,99

inputs/10p.txt

@@ -0,0 +1,33 @@
+.#......##.#..#.......#####...#..
+...#.....##......###....#.##.....
+..#...#....#....#............###.
+.....#......#.##......#.#..###.#.
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+.#.#....##.......#.....##.##.#.##

inputs/10s1.txt

@@ -0,0 +1,5 @@
+.#..#
+.....
+#####
+....#
+...##

inputs/10s2.txt

@@ -0,0 +1,10 @@
+......#.#.
+#..#.#....
+..#######.
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+..#....#.#
+#..#....#.
+.##.#..###
+##...#..#.
+.#....####

inputs/10s3.txt

@@ -0,0 +1,10 @@
+#.#...#.#.
+.###....#.
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+##.#.#.#.#
+....#.#.#.
+.##..###.#
+..#...##..
+..##....##
+......#...
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inputs/10s4.txt

@@ -0,0 +1,10 @@
+.#..#..###
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+....###.#.
+..###.##.#
+##.##.#.#.
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inputs/10s5.txt

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inputs/10s6.txt

@@ -0,0 +1,5 @@
+.#....#####...#..
+##...##.#####..##
+##...#...#.#####.
+..#.....#...###..
+..#.#.....#....##

inputs/11p.txt

@@ -0,0 +1 @@
+3,8,1005,8,330,1106,0,11,0,0,0,104,1,104,0,3,8,102,-1,8,10,101,1,10,10,4,10,1008,8,0,10,4,10,102,1,8,29,3,8,1002,8,-1,10,1001,10,1,10,4,10,1008,8,0,10,4,10,101,0,8,51,1,1103,2,10,1006,0,94,1006,0,11,1,1106,13,10,3,8,1002,8,-1,10,101,1,10,10,4,10,1008,8,1,10,4,10,1001,8,0,87,3,8,102,-1,8,10,101,1,10,10,4,10,1008,8,0,10,4,10,1001,8,0,109,2,1105,5,10,2,103,16,10,1,1103,12,10,2,105,2,10,3,8,102,-1,8,10,1001,10,1,10,4,10,108,1,8,10,4,10,1001,8,0,146,1006,0,49,2,1,12,10,2,1006,6,10,1,1101,4,10,3,8,1002,8,-1,10,1001,10,1,10,4,10,108,0,8,10,4,10,1001,8,0,183,1,6,9,10,1006,0,32,3,8,102,-1,8,10,1001,10,1,10,4,10,1008,8,1,10,4,10,101,0,8,213,2,1101,9,10,3,8,1002,8,-1,10,1001,10,1,10,4,10,1008,8,1,10,4,10,101,0,8,239,1006,0,47,1006,0,4,2,6,0,10,1006,0,58,3,8,1002,8,-1,10,1001,10,1,10,4,10,1008,8,0,10,4,10,102,1,8,274,2,1005,14,10,1006,0,17,1,104,20,10,1006,0,28,3,8,102,-1,8,10,1001,10,1,10,4,10,108,1,8,10,4,10,1002,8,1,309,101,1,9,9,1007,9,928,10,1005,10,15,99,109,652,104,0,104,1,21101,0,937263411860,1,21102,347,1,0,1105,1,451,21101,932440724376,0,1,21102,1,358,0,1105,1,451,3,10,104,0,104,1,3,10,104,0,104,0,3,10,104,0,104,1,3,10,104,0,104,1,3,10,104,0,104,0,3,10,104,0,104,1,21101,0,29015167015,1,21101,0,405,0,1106,0,451,21102,1,3422723163,1,21101,0,416,0,1106,0,451,3,10,104,0,104,0,3,10,104,0,104,0,21101,0,868389376360,1,21101,0,439,0,1105,1,451,21102,825544712960,1,1,21102,1,450,0,1106,0,451,99,109,2,21201,-1,0,1,21101,0,40,2,21102,482,1,3,21102,1,472,0,1106,0,515,109,-2,2106,0,0,0,1,0,0,1,109,2,3,10,204,-1,1001,477,478,493,4,0,1001,477,1,477,108,4,477,10,1006,10,509,1101,0,0,477,109,-2,2106,0,0,0,109,4,2101,0,-1,514,1207,-3,0,10,1006,10,532,21102,1,0,-3,22101,0,-3,1,22102,1,-2,2,21102,1,1,3,21101,551,0,0,1106,0,556,109,-4,2105,1,0,109,5,1207,-3,1,10,1006,10,579,2207,-4,-2,10,1006,10,579,22102,1,-4,-4,1106,0,647,21201,-4,0,1,21201,-3,-1,2,21202,-2,2,3,21102,1,598,0,1106,0,556,22101,0,1,-4,21101,1,0,-1,2207,-4,-2,10,1006,10,617,21102,0,1,-1,22202,-2,-1,-2,2107,0,-3,10,1006,10,639,21201,-1,0,1,21102,639,1,0,105,1,514,21202,-2,-1,-2,22201,-4,-2,-4,109,-5,2105,1,0

inputs/12p.txt

@@ -0,0 +1,4 @@
+<x=-6, y=-5, z=-8>
+<x=0, y=-3, z=-13>
+<x=-15, y=10, z=-11>
+<x=-3, y=-8, z=3>

inputs/12s1.txt

@@ -0,0 +1,4 @@
+<x=-1, y=0, z=2>
+<x=2, y=-10, z=-7>
+<x=4, y=-8, z=8>
+<x=3, y=5, z=-1>

inputs/12s2.txt

@@ -0,0 +1,4 @@
+<x=-8, y=-10, z=0>
+<x=5, y=5, z=10>
+<x=2, y=-7, z=3>
+<x=9, y=-8, z=-3>

inputs/14p.txt

@@ -0,0 +1,56 @@
+6 WBVJ, 16 CDVNK => 2 PJBZT
+135 ORE => 8 MWDXJ
+27 NBRHT, 2 NSWK, 2 CMHMQ, 29 NFCB, 11 KNGJ, 12 MGCKC, 56 NHTKL, 7 WNFSV => 1 FUEL
+1 SFJFX, 3 MXNK => 4 NLSBZ
+2 PFKRW, 1 VXFRX, 22 QDJCL => 6 GBDG
+7 TSTF, 4 ZLJN => 7 DMWS
+5 KPCF, 1 DLMDJ, 1 FNWGH => 6 TSTF
+8 DTWKS, 1 GBDG => 4 CGZQ
+26 CNWZM, 4 KPCF => 3 DTWKS
+1 JVLHM, 7 DTWKS, 7 PJBZT => 8 MRPHV
+2 MWDXJ => 3 VHFPC
+1 WXNW, 6 PFKRW => 7 ZVGVP
+2 ZVGVP => 1 CMHMQ
+8 JVLHM, 11 XRKN, 1 HCGKZ => 8 CHZLX
+20 TSTF => 4 XDZMZ
+3 CMHMQ, 7 ZVGVP, 10 XRKN => 9 FNWGH
+12 HCGKZ, 4 NLSBZ, 15 RWRDP, 4 MRPHV, 31 KRDV, 6 PMXK, 2 NFVZ => 7 KNGJ
+1 TXZCM => 9 BMPJ
+2 ZFXQ => 3 NBRHT
+13 JVLHM, 1 VHFPC => 3 PBJPZ
+7 HCGKZ => 7 PMXK
+2 RWRDP, 3 VSTQ, 12 PMXK => 7 MXNK
+1 PJBZT, 3 QRSK => 1 KRDV
+1 MGCKC, 6 CMHMQ => 6 PQTVS
+1 TNHCS, 24 ZLJN => 4 RWRDP
+5 MWDXJ, 1 WXNW => 9 QBCLF
+1 ZFXQ, 1 DLMDJ => 4 DJXRM
+1 ZFXQ => 2 CNWZM
+1 KPCF => 6 ZXDVF
+2 MRPHV => 1 GSTG
+5 BMPJ, 2 ZLJN => 8 XQJZ
+1 MWDXJ, 1 ZVGVP => 3 CDVNK
+3 NFCB, 3 CMHMQ, 1 MWDXJ => 4 XRKN
+1 WXNW, 1 TXZCM => 5 ZLJN
+4 ZXDVF => 4 WBVJ
+2 GBDG => 4 KPCF
+4 CHZLX, 7 ZFXQ, 14 PQTVS => 9 VSTQ
+3 TXZCM, 7 ZLJN, 7 ZXDVF => 9 JVLHM
+1 DMWS, 3 TSTF => 5 HCGKZ
+2 CGZQ => 4 NFVZ
+2 PQTVS, 9 VMNJ => 9 TXZCM
+3 KPCF => 4 DLMDJ
+7 VMNJ, 24 XQJZ, 7 GSTG, 8 NLSBZ, 10 MGCKC, 2 SFJFX, 18 BMPJ => 1 NSWK
+41 CNWZM, 5 DJXRM, 1 QRSK, 1 KPCF, 15 XDZMZ, 3 MRPHV, 1 NLSBZ, 9 KRDV => 2 WNFSV
+10 PBJPZ, 29 BMPJ, 2 PMXK => 7 SFJFX
+116 ORE => 4 WXNW
+2 CNWZM => 2 TNHCS
+10 QBCLF => 7 NFCB
+1 QBCLF => 2 ZFXQ
+15 ZLJN => 7 QRSK
+183 ORE => 3 QDJCL
+11 GBDG => 5 VMNJ
+4 DMWS, 3 QRSK => 3 NHTKL
+124 ORE => 6 VXFRX
+1 MWDXJ => 6 MGCKC
+108 ORE => 9 PFKRW

inputs/14s1.txt

@@ -0,0 +1,6 @@
+10 ORE => 10 A
+1 ORE => 1 B
+7 A, 1 B => 1 C
+7 A, 1 C => 1 D
+7 A, 1 D => 1 E
+7 A, 1 E => 1 FUEL

inputs/14s2.txt

@@ -0,0 +1,7 @@
+9 ORE => 2 A
+8 ORE => 3 B
+7 ORE => 5 C
+3 A, 4 B => 1 AB
+5 B, 7 C => 1 BC
+4 C, 1 A => 1 CA
+2 AB, 3 BC, 4 CA => 1 FUEL

inputs/14s3.txt

@@ -0,0 +1,9 @@
+157 ORE => 5 NZVS
+165 ORE => 6 DCFZ
+44 XJWVT, 5 KHKGT, 1 QDVJ, 29 NZVS, 9 GPVTF, 48 HKGWZ => 1 FUEL
+12 HKGWZ, 1 GPVTF, 8 PSHF => 9 QDVJ
+179 ORE => 7 PSHF
+177 ORE => 5 HKGWZ
+7 DCFZ, 7 PSHF => 2 XJWVT
+165 ORE => 2 GPVTF
+3 DCFZ, 7 NZVS, 5 HKGWZ, 10 PSHF => 8 KHKGT

inputs/14s4.txt

@@ -0,0 +1,12 @@
+2 VPVL, 7 FWMGM, 2 CXFTF, 11 MNCFX => 1 STKFG
+17 NVRVD, 3 JNWZP => 8 VPVL
+53 STKFG, 6 MNCFX, 46 VJHF, 81 HVMC, 68 CXFTF, 25 GNMV => 1 FUEL
+22 VJHF, 37 MNCFX => 5 FWMGM
+139 ORE => 4 NVRVD
+144 ORE => 7 JNWZP
+5 MNCFX, 7 RFSQX, 2 FWMGM, 2 VPVL, 19 CXFTF => 3 HVMC
+5 VJHF, 7 MNCFX, 9 VPVL, 37 CXFTF => 6 GNMV
+145 ORE => 6 MNCFX
+1 NVRVD => 8 CXFTF
+1 VJHF, 6 MNCFX => 4 RFSQX
+176 ORE => 6 VJHF

inputs/14s5.txt

@@ -0,0 +1,17 @@
+171 ORE => 8 CNZTR
+7 ZLQW, 3 BMBT, 9 XCVML, 26 XMNCP, 1 WPTQ, 2 MZWV, 1 RJRHP => 4 PLWSL
+114 ORE => 4 BHXH
+14 VRPVC => 6 BMBT
+6 BHXH, 18 KTJDG, 12 WPTQ, 7 PLWSL, 31 FHTLT, 37 ZDVW => 1 FUEL
+6 WPTQ, 2 BMBT, 8 ZLQW, 18 KTJDG, 1 XMNCP, 6 MZWV, 1 RJRHP => 6 FHTLT
+15 XDBXC, 2 LTCX, 1 VRPVC => 6 ZLQW
+13 WPTQ, 10 LTCX, 3 RJRHP, 14 XMNCP, 2 MZWV, 1 ZLQW => 1 ZDVW
+5 BMBT => 4 WPTQ
+189 ORE => 9 KTJDG
+1 MZWV, 17 XDBXC, 3 XCVML => 2 XMNCP
+12 VRPVC, 27 CNZTR => 2 XDBXC
+15 KTJDG, 12 BHXH => 5 XCVML
+3 BHXH, 2 VRPVC => 7 MZWV
+121 ORE => 7 VRPVC
+7 XCVML => 6 RJRHP
+5 BHXH, 4 VRPVC => 5 LTCX

inputs/15p.txt

@@ -0,0 +1 @@
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inputs/16p.txt

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inputs/16s1.txt

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inputs/16s2.txt

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inputs/16s3.txt

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inputs/16s4.txt

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inputs/17p.txt

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+#.#...#.#...#...#.....#...#.#...#...#...#...#...#.#...#...#..o#...#.#.#.......#.#
+#.#####.#####.#.#######.#.#.#.#.#####.#.#######.#.#.###.###########.#.#######.#.#
+#.....#...#...#.#.......#.#.#.#.....#.#.#.....#.#.#.....#.........#.#.#...#.....#
+#####L###.#.###.#.#######.#.###.###.###.###.#.#.#.#######.#.#####.#.#.#.#.#######
+#...#.#...#.#...#...#...#.#...#.#.......#...#.#...#.....#.#.....#.#.#.#.#.......#
+#.#.#.#.###.#.#.###.#.#.#.###.#.#######.#.#######.#.#.###.#####.###.#.#.#######.#
+#.#.#.#.....#.#.#...#.#.....#.#.......#.#.......#...#.#...#..j..#..v#.........#.#
+#.#.#.#######.#.#.###.#.#####.###.###.###.#####.###.###.###.###.#.###.#########.#
+#.#.#.#...#...#.#...#.#.#...#...#...#...#...#.#.#...#...#.#.#...#.#.#.#.........#
+###.#.#.#.#.#######.#.###.#.###.#####.#.###.#.#.#.###.###.#.#####.#.#.#.#######.#
+#...#...#.#.........#.....#...#.....#f#.#.....#.....#e..#.#.......#.#.#.#.#...#.#
+#.#######.#################.#.#####.###.#.#############A#.#########.#.#.#.#.#.#.#
+#...#.....#.....#...#.....#.#.....#.....#...#...#.....#...#...#.......#.#.#.#..z#
+#.#.#.#####.###.###.#.###C#.###########.###.#.#T#.#.#####.#.###.#######.#.#.#####
+#.#.#.X.#k..#.#...#...#...#.....#.....#.#...#.#...#.......#.....#....p..#...#...#
+#.#.###.###.#.###.#####.#.#####.#.#.###.#.###.###################.#######.###.#.#
+#.#.........#...........#.....#...#.....#...#.....................#...........#.#
+#################################################################################

inputs/18s1.txt

@@ -0,0 +1,3 @@
+#########
+#b.A.@.a#
+#########

inputs/18s2.txt

@@ -0,0 +1,5 @@
+########################
+#f.D.E.e.C.b.A.@.a.B.c.#
+######################.#
+#d.....................#
+########################

inputs/18s3.txt

@@ -0,0 +1,5 @@
+########################
+#...............b.C.D.f#
+#.######################
+#.....@.a.B.c.d.A.e.F.g#
+########################

inputs/18s4.txt

@@ -0,0 +1,9 @@
+#################
+#i.G..c...e..H.p#
+########.########
+#j.A..b...f..D.o#
+########@########
+#k.E..a...g..B.n#
+########.########
+#l.F..d...h..C.m#
+#################

inputs/18s5.txt

@@ -0,0 +1,6 @@
+########################
+#@..............ac.GI.b#
+###d#e#f################
+###A#B#C################
+###g#h#i################
+########################

inputs/18s6.txt

@@ -0,0 +1,7 @@
+#######
+#a.#Cd#
+##...##
+##.@.##
+##...##
+#cB#Ab#
+#######

inputs/18s7.txt

@@ -0,0 +1,7 @@
+###############
+#d.ABC.#.....a#
+######...######
+######.@.######
+######...######
+#b.....#.....c#
+###############

inputs/18s8.txt

@@ -0,0 +1,7 @@
+#############
+#DcBa.#.GhKl#
+#.###...#I###
+#e#d#.@.#j#k#
+###C#...###J#
+#fEbA.#.FgHi#
+#############

inputs/18s9.txt

@@ -0,0 +1,9 @@
+#############
+#g#f.D#..h#l#
+#F###e#E###.#
+#dCba...BcIJ#
+#####.@.#####
+#nK.L...G...#
+#M###N#H###.#
+#o#m..#i#jk.#
+#############

main.go

@@ -36,6 +36,19 @@ var dayMap = []day{
 	&days.Day03{},
 	&days.Day04{},
 	&days.Day05{},
+	&days.Day06{},
+	&days.Day07{},
+	&days.Day08{},
+	&days.Day09{},
+	&days.Day10{},
+	&days.Day11{},
+	&days.Day12{},
+	&days.Day13{},
+	&days.Day14{},
+	&days.Day15{},
+	&days.Day16{},
+	&days.Day17{},
+	&days.Day18{},
 }
 
 func main() {

utilities/array.go

@@ -0,0 +1,12 @@
+package utilities
+
+// ArrayContains returns whether the specified array contains the specified value
+func ArrayContains[T comparable](array []T, val T) bool {
+	for _, v := range array {
+		if v == val {
+			return true
+		}
+	}
+
+	return false
+}

utilities/constraints.go

@@ -0,0 +1,29 @@
+package utilities
+
+type Ordered interface {
+	Integer | Float | ~string
+}
+
+type Signed interface {
+	~int | ~int8 | ~int16 | ~int32 | ~int64
+}
+
+type Unsigned interface {
+	~uint | ~uint8 | ~uint16 | ~uint32 | ~uint64 | ~uintptr
+}
+
+type Integer interface {
+	Signed | Unsigned
+}
+
+type Float interface {
+	~float32 | ~float64
+}
+
+type Complex interface {
+	~complex64 | ~complex128
+}
+
+type Number interface {
+	Integer | Float
+}

utilities/intcode.go

@@ -7,23 +7,27 @@ import (
 )
 
 const (
-	opAdd         = 1
-	opMultiply    = 2
-	opInput       = 3
-	opOutput      = 4
-	opJumpIfTrue  = 5
-	opJumpIfFalse = 6
-	opLessThan    = 7
-	opEquals      = 8
-	opHalt        = 99
+	opAdd          = 1
+	opMultiply     = 2
+	opInput        = 3
+	opOutput       = 4
+	opJumpIfTrue   = 5
+	opJumpIfFalse  = 6
+	opLessThan     = 7
+	opEquals       = 8
+	opRelativeBase = 9
+	opHalt         = 99
 
 	modePosition  = 0
 	modeImmediate = 1
+	modeRelative  = 2
 )
 
 type IntcodeProgram struct {
-	memory  []int64
-	program []int64
+	memory        []int64
+	program       []int64
+	relativeBase  int
+	haltRequested bool
 }
 
 type IntcodeProgramState struct {
@@ -74,34 +78,60 @@ func (p *IntcodeProgram) Copy() IntcodeProgram {
 func (p *IntcodeProgram) init() {
 	if p.memory == nil {
 		p.memory = make([]int64, len(p.program))
-		p.Reset()
+		copy(p.memory, p.program)
 	}
 }
 
 func (p *IntcodeProgram) getParamValue(param, mode int) int64 {
 	switch mode {
 	case modePosition:
-		return p.memory[param]
+		return p.GetMemory(param)
 
 	case modeImmediate:
 		return int64(param)
+
+	case modeRelative:
+		return p.GetMemory(param + p.relativeBase)
 	}
 
 	panic("unhandled param mode")
 }
 
 func (p *IntcodeProgram) GetMemory(idx int) int64 {
+	p.ensureMemoryCapacity(idx)
 	return p.memory[idx]
 }
 
 func (p *IntcodeProgram) SetMemory(idx int, val int64) {
 	p.init()
+	p.ensureMemoryCapacity(idx)
 	p.memory[idx] = val
 }
 
+func (p *IntcodeProgram) setMemory(idx int, val int64, mode int) {
+	if mode == modeImmediate {
+		panic("exception executing program - write parameter must never be in immediate mode")
+	}
+	if mode == modeRelative {
+		idx = idx + p.relativeBase
+	}
+
+	p.SetMemory(idx, val)
+}
+
+func (p *IntcodeProgram) ensureMemoryCapacity(address int) {
+	if len(p.memory) > address {
+		return
+	}
+
+	p.memory = append(p.memory, make([]int64, address+1-len(p.memory))...)
+}
+
 func (p *IntcodeProgram) Reset() {
+	p.memory = nil
 	p.init()
 	copy(p.memory, p.program)
+	p.relativeBase = 0
 }
 
 func (p *IntcodeProgram) Run() {
@@ -112,8 +142,8 @@ func (p *IntcodeProgram) RunIn(inputFunc ProvideInputFunc, outputFunc ReceiveOut
 	p.init()
 
 	inputsRequested := 0
-	for instructionPointer := 0; instructionPointer < len(p.program); {
-		instruction := p.memory[instructionPointer]
+	for instructionPointer := 0; instructionPointer < len(p.program) && !p.haltRequested; {
+		instruction := p.GetMemory(instructionPointer)
 		instructionPointer++
 
 		paramModes := [3]int{
@@ -130,37 +160,37 @@ func (p *IntcodeProgram) RunIn(inputFunc ProvideInputFunc, outputFunc ReceiveOut
 		opcode := instruction % 100
 		switch opcode {
 		case opAdd:
-			param1 := p.memory[instructionPointer]
-			param2 := p.memory[instructionPointer+1]
-			param3 := p.memory[instructionPointer+2]
-			p.memory[param3] = p.getParamValue(int(param1), paramModes[0]) + p.getParamValue(int(param2), paramModes[1])
+			param1 := p.GetMemory(instructionPointer)
+			param2 := p.GetMemory(instructionPointer + 1)
+			param3 := p.GetMemory(instructionPointer + 2)
+			p.setMemory(int(param3), p.getParamValue(int(param1), paramModes[0])+p.getParamValue(int(param2), paramModes[1]), paramModes[2])
 
 			instructionPointer += 3
 
 		case opMultiply:
-			param1 := p.memory[instructionPointer]
-			param2 := p.memory[instructionPointer+1]
-			param3 := p.memory[instructionPointer+2]
-			p.memory[param3] = p.getParamValue(int(param1), paramModes[0]) * p.getParamValue(int(param2), paramModes[1])
+			param1 := p.GetMemory(instructionPointer)
+			param2 := p.GetMemory(instructionPointer + 1)
+			param3 := p.GetMemory(instructionPointer + 2)
+			p.setMemory(int(param3), p.getParamValue(int(param1), paramModes[0])*p.getParamValue(int(param2), paramModes[1]), paramModes[2])
 
 			instructionPointer += 3
 
 		case opInput:
 			inputsRequested++
-			param1 := p.memory[instructionPointer]
-			p.memory[param1] = inputFunc(inputsRequested)
+			param1 := p.GetMemory(instructionPointer)
+			p.setMemory(int(param1), inputFunc(inputsRequested), paramModes[0])
 
 			instructionPointer += 1
 
 		case opOutput:
-			param1 := p.memory[instructionPointer]
+			param1 := p.GetMemory(instructionPointer)
 			outputFunc(p.getParamValue(int(param1), paramModes[0]), p.makeState(instructionPointer))
 
 			instructionPointer += 1
 
 		case opJumpIfTrue:
-			param1 := p.memory[instructionPointer]
-			param2 := p.memory[instructionPointer+1]
+			param1 := p.GetMemory(instructionPointer)
+			param2 := p.GetMemory(instructionPointer + 1)
 
 			if p.getParamValue(int(param1), paramModes[0]) != 0 {
 				instructionPointer = int(p.getParamValue(int(param2), paramModes[1]))
@@ -169,8 +199,8 @@ func (p *IntcodeProgram) RunIn(inputFunc ProvideInputFunc, outputFunc ReceiveOut
 			}
 
 		case opJumpIfFalse:
-			param1 := p.memory[instructionPointer]
-			param2 := p.memory[instructionPointer+1]
+			param1 := p.GetMemory(instructionPointer)
+			param2 := p.GetMemory(instructionPointer + 1)
 
 			if p.getParamValue(int(param1), paramModes[0]) == 0 {
 				instructionPointer = int(p.getParamValue(int(param2), paramModes[1]))
@@ -179,31 +209,38 @@ func (p *IntcodeProgram) RunIn(inputFunc ProvideInputFunc, outputFunc ReceiveOut
 			}
 
 		case opLessThan:
-			param1 := p.memory[instructionPointer]
-			param2 := p.memory[instructionPointer+1]
-			param3 := p.memory[instructionPointer+2]
+			param1 := p.GetMemory(instructionPointer)
+			param2 := p.GetMemory(instructionPointer + 1)
+			param3 := p.GetMemory(instructionPointer + 2)
 
 			if p.getParamValue(int(param1), paramModes[0]) < p.getParamValue(int(param2), paramModes[1]) {
-				p.memory[param3] = 1
+				p.setMemory(int(param3), 1, paramModes[2])
 			} else {
-				p.memory[param3] = 0
+				p.setMemory(int(param3), 0, paramModes[2])
 			}
 
 			instructionPointer += 3
 
 		case opEquals:
-			param1 := p.memory[instructionPointer]
-			param2 := p.memory[instructionPointer+1]
-			param3 := p.memory[instructionPointer+2]
+			param1 := p.GetMemory(instructionPointer)
+			param2 := p.GetMemory(instructionPointer + 1)
+			param3 := p.GetMemory(instructionPointer + 2)
 
 			if p.getParamValue(int(param1), paramModes[0]) == p.getParamValue(int(param2), paramModes[1]) {
-				p.memory[param3] = 1
+				p.setMemory(int(param3), 1, paramModes[2])
 			} else {
-				p.memory[param3] = 0
+				p.setMemory(int(param3), 0, paramModes[2])
 			}
 
 			instructionPointer += 3
 
+		case opRelativeBase:
+			param1 := p.GetMemory(instructionPointer)
+
+			p.relativeBase += int(p.getParamValue(int(param1), paramModes[0]))
+
+			instructionPointer += 1
+
 		case opHalt:
 			instructionPointer = len(p.program)
 
@@ -211,4 +248,10 @@ func (p *IntcodeProgram) RunIn(inputFunc ProvideInputFunc, outputFunc ReceiveOut
 			panic(fmt.Sprintf("exception executing program - unhandled opcode %d", opcode))
 		}
 	}
+
+	p.haltRequested = false
+}
+
+func (p *IntcodeProgram) Stop() {
+	p.haltRequested = true
 }

utilities/map.go

@@ -0,0 +1,27 @@
+package utilities
+
+func MapKeys[T comparable, U any](m map[T]U) []T {
+	r := make([]T, 0, len(m))
+	for k := range m {
+		r = append(r, k)
+	}
+	return r
+}
+
+func MapValues[T comparable, U any](m map[T]U) []U {
+	r := make([]U, 0, len(m))
+	for _, v := range m {
+		r = append(r, v)
+	}
+	return r
+}
+
+// CopyMap returns a copy of the passed-in map. Note: currently only works if [U]
+// is not a map or slice.
+func CopyMap[T comparable, U any](m map[T]U) map[T]U {
+	r := make(map[T]U)
+	for k, v := range m {
+		r[k] = v
+	}
+	return r
+}

utilities/math.go

@@ -0,0 +1,49 @@
+package utilities
+
+import "math"
+
+func GCD[T Integer](a, b T) T {
+	if b == 0 {
+		return a
+	}
+	return GCD(b, a%b)
+}
+
+func LCM[T Integer](nums ...T) uint64 {
+	num := len(nums)
+	if num == 0 {
+		return 0
+	} else if num == 1 {
+		return uint64(nums[0])
+	}
+
+	ret := lcm(nums[0], nums[1])
+	for i := 2; i < len(nums); i++ {
+		ret = lcm(uint64(nums[i]), ret)
+	}
+	return ret
+}
+
+func lcm[T Integer](a, b T) uint64 {
+	return uint64(a*b) / uint64(GCD(a, b))
+}
+
+func Min[T Number](nums ...T) T {
+	numNums := len(nums)
+	if numNums == 2 {
+		return T(math.Min(float64(nums[0]), float64(nums[1])))
+	}
+
+	if numNums == 0 {
+		return 0
+	}
+
+	least := nums[0]
+	for i := 1; i < numNums; i++ {
+		if nums[i] < least {
+			least = nums[i]
+		}
+	}
+
+	return least
+}

utilities/pair.go

@@ -0,0 +1,6 @@
+package utilities
+
+type Pair[T, U any] struct {
+	First  T
+	Second U
+}

utilities/permutations.go

@@ -0,0 +1,34 @@
+package utilities
+
+type Permutable interface {
+	~int | ~int8 | ~int16 | ~int32 | ~int64 | ~uint | ~uint8 | ~uint16 | ~uint32 | ~uint64
+}
+
+func GetPermutations[T Permutable](arr ...T) [][]T {
+	var helper func([]T, int)
+	res := [][]T{}
+
+	helper = func(arr []T, n int) {
+		if n == 1 {
+			tmp := make([]T, len(arr))
+			copy(tmp, arr)
+			res = append(res, tmp)
+		} else {
+			for i := 0; i < n; i++ {
+				helper(arr, n-1)
+				if n%2 == 1 {
+					tmp := arr[i]
+					arr[i] = arr[n-1]
+					arr[n-1] = tmp
+				} else {
+					tmp := arr[0]
+					arr[0] = arr[n-1]
+					arr[n-1] = tmp
+				}
+			}
+		}
+	}
+
+	helper(arr, len(arr))
+	return res
+}

utilities/vector.go

@@ -0,0 +1,81 @@
+package utilities
+
+import "math"
+
+type Vec2[T Number] struct {
+	X T
+	Y T
+}
+
+type Vec3[T Number] struct {
+	X T
+	Y T
+	Z T
+}
+
+type Vec2i Vec2[int]
+
+func (v Vec2[T]) Dot(other Vec2[T]) T {
+	return (v.X * other.X) + (v.Y * other.Y)
+}
+
+func (v Vec2[T]) Len() T {
+	return T(math.Sqrt(float64(v.LenSquared())))
+}
+
+func (v Vec2[T]) LenSquared() T {
+	return (v.X * v.X) + (v.Y * v.Y)
+}
+
+func (v Vec2[T]) To(other Vec2[T]) Vec2[T] {
+	return Vec2[T]{
+		X: v.X - other.X,
+		Y: v.Y - other.Y,
+	}
+}
+
+func (v Vec2[T]) AngleBetween(other Vec2[T]) float64 {
+	rad := math.Atan2(float64(other.Y-v.Y), float64(other.X-v.X))
+	return rad * 180 / math.Pi
+}
+
+func (v Vec2[T]) Equals(other Vec2[T]) bool {
+	return v.X == other.X &&
+		v.Y == other.Y
+}
+
+func (v Vec2[T]) ManhattanDistance(other Vec2[T]) T {
+	return T(math.Abs(float64(v.X-other.X)) + math.Abs(float64(v.Y-other.Y)))
+}
+
+func VecBetween[T Number](a, b Vec2[T]) Vec2[T] {
+	return a.To(b)
+}
+
+func ManhattanDistance[T Number](a, b Vec2[T]) T {
+	return a.ManhattanDistance(b)
+}
+
+func (v Vec3[T]) Dot(other Vec3[T]) T {
+	return (v.X * other.X) + (v.Y * other.Y) + (v.Z * other.Z)
+}
+
+func (v Vec3[T]) Len() T {
+	return T(math.Sqrt(float64(v.LenSquared())))
+}
+
+func (v Vec3[T]) LenSquared() T {
+	return (v.X * v.X) + (v.Y * v.Y) + (v.Z * v.Z)
+}
+
+func (v *Vec3[T]) Add(other Vec3[T]) {
+	v.X += other.X
+	v.Y += other.Y
+	v.Z += other.Z
+}
+
+func (v Vec3[T]) Equals(other Vec3[T]) bool {
+	return v.X == other.X &&
+		v.Y == other.Y &&
+		v.Z == other.Z
+}