2022 Day 20 Complete!
This commit is contained in:
parent
33d1a7c3c6
commit
6a843e488c
@ -5,6 +5,7 @@ import (
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"math"
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"os"
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"strings"
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"time"
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h "git.bullercodeworks.com/brian/adventofcode/helpers"
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)
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@ -42,8 +43,12 @@ func main() {
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}
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}
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part1(inp)
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part2(inp)
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if part == 1 || part == -1 {
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part1(inp)
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}
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if part == 2 || part == -1 {
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part2(inp)
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}
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}
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func part1(inp []string) {
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@ -74,49 +79,122 @@ func part1(inp []string) {
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fmt.Println(nopeCount)
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}
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type Sensor struct {
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c h.Coordinate // Sensor Position
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b h.Coordinate // Beacon Position
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d int // Distance
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}
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func (s Sensor) isInRange(c h.Coordinate) bool { return s.c.Distance(c) <= s.d }
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func (s Sensor) String() string { return s.c.String() }
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func part2(inp []string) {
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min_x, max_x := math.MaxInt, math.MinInt
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var spots [][]int
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var sensors []Sensor
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for i := range inp {
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s, b := strToCoords(inp[i])
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xs, ys, xb, yb := s.X, s.Y, b.X, b.Y
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dist := s.Distance(b)
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l, r := xs-dist, xs+dist
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min_x = h.Min(min_x, l)
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max_x = h.Max(max_x, r)
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spots = append(spots, []int{xs, ys, xb, yb, dist})
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s := Sensor{}
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s.c, s.b = strToCoords(inp[i])
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s.d = s.c.Distance(s.b)
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sensors = append(sensors, s)
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}
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max := testRow * 2
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var found h.Coordinate
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SEARCH:
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for y := 0; y <= max; y++ {
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for x := 0; x <= max; x++ {
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fmt.Printf("Testing %d,%d...", x, y)
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var nope bool
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for _, c := range spots {
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if x == c[2] && y == c[3] {
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break
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}
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if h.ManhattanDistance(x, y, c[0], c[1]) <= c[4] {
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nope = true
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break
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found := []h.Coordinate{}
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// Check around each sensor, the beacon must be it's distance + 1
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for _, sensor := range sensors {
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d := sensor.d + 1
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testEnds := []h.Coordinate{
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{X: sensor.c.X, Y: sensor.c.Y - d},
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{X: sensor.c.X + d, Y: sensor.c.Y},
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{X: sensor.c.X, Y: sensor.c.Y + d},
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{X: sensor.c.X - d, Y: sensor.c.Y},
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}
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printMap(sensors, max, max, h.Coordinate{X: math.MinInt, Y: math.MinInt})
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var tstX, tstY int
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for i := 0; i < 3; i++ {
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// Test all spots between testEnds[i] & testEnds[i+1]
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for tstX != testEnds[i+1].X && tstY != testEnds[i+1].Y {
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if testEnds[i].X < testEnds[i+1].X {
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tstX++
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if testEnds[i].Y < testEnds[i+1].Y {
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tstY++
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} else {
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tstY--
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}
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} else {
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tstX--
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if testEnds[i].Y < testEnds[i+1].Y {
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tstY++
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} else {
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tstY--
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}
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}
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}
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if !nope {
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fmt.Println("Yup")
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found = h.Coordinate{X: x, Y: y}
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break SEARCH
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if tstX <= max && tstY <= max {
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fmt.Print(h.CLEAR_SCREEN)
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printMap(sensors, max, max, h.Coordinate{X: tstX, Y: tstY})
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fmt.Println("Testing", tstX, ",", tstY)
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time.Sleep(time.Second / 10)
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if testSpot(tstX, tstY, sensors) {
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found = append(found, h.Coordinate{X: tstX, Y: tstY})
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}
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}
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fmt.Println("Nope")
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}
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}
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fmt.Println("# Part 2")
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fmt.Println(found)
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fmt.Println((found.X * 4000000) + found.Y)
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//fmt.Println((found.X * 4000000) + found.Y)
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}
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func printMap(m [][]int) {
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func testSpot(x, y int, sensors []Sensor) bool {
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var wasInRange bool
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for i := range sensors {
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if sensors[i].isInRange(h.Coordinate{X: x, Y: y}) {
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wasInRange = true
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break
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}
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}
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return !wasInRange
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}
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func printMap(sensors []Sensor, ceilX, ceilY int, tstPos h.Coordinate) {
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minX, maxX, minY, maxY := math.MaxInt, math.MinInt, math.MaxInt, math.MinInt
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for i := range sensors {
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minX = h.Min(sensors[i].b.X, minX)
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maxX = h.Max(sensors[i].b.X, maxX)
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minY = h.Min(sensors[i].b.Y, minY)
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maxY = h.Max(sensors[i].b.Y, maxY)
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}
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for y := minY; y <= maxY; y++ {
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for x := minX; x <= maxX; x++ {
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wrk := h.Coordinate{X: x, Y: y}
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var found bool
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for _, sensor := range sensors {
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if sensor.c.Equals(wrk) {
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fmt.Print("S")
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found = true
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break
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} else if sensor.b.Equals(wrk) {
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fmt.Print("B")
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found = true
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break
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} else if sensor.isInRange(wrk) {
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fmt.Print("#")
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found = true
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break
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}
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}
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if !found {
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if wrk.Equals(tstPos) {
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fmt.Print(h.FILL_CHAR)
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} else {
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fmt.Print(".")
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}
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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 strToCoords(s string) (h.Coordinate, h.Coordinate) {
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@ -57,6 +57,7 @@ func (v *Volcano) TrackStepCount(from *Room, to *Room, visited []*Room) int {
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if !IsRoomIn(t, visited) {
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fmt.Println(" Haven't Visited")
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wrk := v.TrackStepCount(t, to, append(visited, t)) + 1
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fmt.Println(" From", from, "to", to, "in", wrk)
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minSteps = h.Min(minSteps, wrk)
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}
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}
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5000
2022/day20/input
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5000
2022/day20/input
Normal file
File diff suppressed because it is too large
Load Diff
101
2022/day20/main.go
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101
2022/day20/main.go
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package main
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import (
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"fmt"
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h "git.bullercodeworks.com/brian/adventofcode/helpers"
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)
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type Node struct {
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value int
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prev *Node
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next *Node
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}
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func main() {
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inp := h.StdinToStringSlice()
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part1(inp)
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part2(inp)
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}
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func part1(inp []string) {
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var list []*Node
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var first *Node
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for i := range inp {
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n := &Node{value: h.Atoi(inp[i])}
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if n.value == 0 {
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first = n
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}
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list = append(list, n)
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}
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initList(list)
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mixAll(list)
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fmt.Println("# Part 1")
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fmt.Println(getCoords(first))
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}
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func part2(inp []string) {
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key := 811589153
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var list []*Node
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var first *Node
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for i := range inp {
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n := &Node{value: h.Atoi(inp[i]) * key}
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if n.value == 0 {
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first = n
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}
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list = append(list, n)
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}
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initList(list)
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for i := 0; i < 10; i++ {
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mixAll(list)
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}
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fmt.Println("# Part 2")
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fmt.Println(getCoords(first))
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}
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func initList(list []*Node) {
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list[0].prev = list[len(list)-1]
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list[len(list)-1].next = list[0]
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for i := 1; i < len(list); i++ {
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list[i].prev = list[i-1]
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list[i-1].next = list[i]
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}
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}
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func move(n *Node, count int) *Node {
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for count < 0 {
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n = n.prev
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count++
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}
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for count > 0 {
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n = n.next
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count--
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}
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return n
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}
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func mix(n *Node, listLen int) {
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t := n.prev
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n.prev.next = n.next
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n.next.prev = n.prev
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t = move(t, n.value%(listLen-1))
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n.prev = t
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n.next = t.next
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n.prev.next = n
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n.next.prev = n
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}
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func mixAll(list []*Node) {
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for _, n := range list {
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mix(n, len(list))
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}
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}
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func getCoords(first *Node) int {
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var res int
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for i, n := 0, first; i < 3; i++ {
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n = move(n, 1000)
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res += n.value
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}
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return res
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}
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151
2022/day20/problem
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151
2022/day20/problem
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@ -0,0 +1,151 @@
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Advent of Code
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br0xen (AoC++) 31*
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--- Day 20: Grove Positioning System ---
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It's finally time to meet back up with the Elves. When you try to contact them, however, you get no reply. Perhaps
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you're out of range?
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You know they're headed to the grove where the star fruit grows, so if you can figure out where that is, you should
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be able to meet back up with them.
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Fortunately, your handheld device has a file (your puzzle input) that contains the grove's coordinates!
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Unfortunately, the file is encrypted - just in case the device were to fall into the wrong hands.
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Maybe you can decrypt it?
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When you were still back at the camp, you overheard some Elves talking about coordinate file encryption. The main
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operation involved in decrypting the file is called mixing.
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The encrypted file is a list of numbers. To mix the file, move each number forward or backward in the file a number
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of positions equal to the value of the number being moved. The list is circular, so moving a number off one end of
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the list wraps back around to the other end as if the ends were connected.
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For example, to move the 1 in a sequence like 4, 5, 6, 1, 7, 8, 9, the 1 moves one position forward: 4, 5, 6, 7, 1,
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8, 9. To move the -2 in a sequence like 4, -2, 5, 6, 7, 8, 9, the -2 moves two positions backward, wrapping around:
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4, 5, 6, 7, 8, -2, 9.
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The numbers should be moved in the order they originally appear in the encrypted file. Numbers moving around during
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the mixing process do not change the order in which the numbers are moved.
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Consider this encrypted file:
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1
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2
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-3
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3
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-2
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0
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4
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Mixing this file proceeds as follows:
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Initial arrangement:
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1, 2, -3, 3, -2, 0, 4
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1 moves between 2 and -3:
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2, 1, -3, 3, -2, 0, 4
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2 moves between -3 and 3:
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1, -3, 2, 3, -2, 0, 4
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-3 moves between -2 and 0:
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1, 2, 3, -2, -3, 0, 4
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3 moves between 0 and 4:
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1, 2, -2, -3, 0, 3, 4
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-2 moves between 4 and 1:
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1, 2, -3, 0, 3, 4, -2
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0 does not move:
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1, 2, -3, 0, 3, 4, -2
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4 moves between -3 and 0:
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1, 2, -3, 4, 0, 3, -2
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Then, the grove coordinates can be found by looking at the 1000th, 2000th, and 3000th numbers after the value 0,
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wrapping around the list as necessary. In the above example, the 1000th number after 0 is 4, the 2000th is -3, and
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the 3000th is 2; adding these together produces 3.
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Mix your encrypted file exactly once. What is the sum of the three numbers that form the grove coordinates?
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Your puzzle answer was 9687.
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--- Part Two ---
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The grove coordinate values seem nonsensical. While you ponder the mysteries of Elf encryption, you suddenly
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remember the rest of the decryption routine you overheard back at camp.
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First, you need to apply the decryption key, 811589153. Multiply each number by the decryption key before you
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begin; this will produce the actual list of numbers to mix.
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Second, you need to mix the list of numbers ten times. The order in which the numbers are mixed does not change
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during mixing; the numbers are still moved in the order they appeared in the original, pre-mixed list. (So, if -3
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appears fourth in the original list of numbers to mix, -3 will be the fourth number to move during each round of
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mixing.)
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Using the same example as above:
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Initial arrangement:
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811589153, 1623178306, -2434767459, 2434767459, -1623178306, 0, 3246356612
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After 1 round of mixing:
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0, -2434767459, 3246356612, -1623178306, 2434767459, 1623178306, 811589153
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After 2 rounds of mixing:
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0, 2434767459, 1623178306, 3246356612, -2434767459, -1623178306, 811589153
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After 3 rounds of mixing:
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0, 811589153, 2434767459, 3246356612, 1623178306, -1623178306, -2434767459
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After 4 rounds of mixing:
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0, 1623178306, -2434767459, 811589153, 2434767459, 3246356612, -1623178306
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After 5 rounds of mixing:
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0, 811589153, -1623178306, 1623178306, -2434767459, 3246356612, 2434767459
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After 6 rounds of mixing:
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0, 811589153, -1623178306, 3246356612, -2434767459, 1623178306, 2434767459
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After 7 rounds of mixing:
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0, -2434767459, 2434767459, 1623178306, -1623178306, 811589153, 3246356612
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After 8 rounds of mixing:
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0, 1623178306, 3246356612, 811589153, -2434767459, 2434767459, -1623178306
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After 9 rounds of mixing:
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0, 811589153, 1623178306, -2434767459, 3246356612, 2434767459, -1623178306
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After 10 rounds of mixing:
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0, -2434767459, 1623178306, 3246356612, -1623178306, 2434767459, 811589153
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The grove coordinates can still be found in the same way. Here, the 1000th number after 0 is 811589153, the 2000th
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is 2434767459, and the 3000th is -1623178306; adding these together produces 1623178306.
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Apply the decryption key and mix your encrypted file ten times. What is the sum of the three numbers that form the
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grove coordinates?
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Your puzzle answer was 1338310513297.
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Both parts of this puzzle are complete! They provide two gold stars: **
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References
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Visible links
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. https://adventofcode.com/
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. https://adventofcode.com/2022/about
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. https://adventofcode.com/2022/events
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. https://adventofcode.com/2022/settings
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. https://adventofcode.com/2022/auth/logout
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. Advent of Code Supporter
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https://adventofcode.com/2022/support
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. https://adventofcode.com/2022
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. https://adventofcode.com/2022
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. https://adventofcode.com/2022/support
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. https://adventofcode.com/2022/sponsors
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. https://adventofcode.com/2022/leaderboard
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. https://adventofcode.com/2022/stats
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. https://adventofcode.com/2022/sponsors
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. https://adventofcode.com/2022
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. https://adventofcode.com/2022/day/20/input
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7
2022/day20/testinput
Normal file
7
2022/day20/testinput
Normal file
@ -0,0 +1,7 @@
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1
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2
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-3
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3
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-2
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0
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4
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