mirror of
https://github.com/Threnklyn/advent-of-code-go.git
synced 2026-05-18 19:13:27 +02:00
2018 day10 - gross 2D grid with moving objects
This commit is contained in:
alexchao26
Executable
+366
@@ -0,0 +1,366 @@
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||||
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|
||||
position=< -9879, -19879> velocity=< 1, 2>
|
||||
position=< 50228, 10153> velocity=<-5, -1>
|
||||
position=< 50187, 50183> velocity=<-5, -5>
|
||||
position=< -9843, -19874> velocity=< 1, 2>
|
||||
position=< 30206, 40178> velocity=<-3, -4>
|
||||
position=<-29867, -49901> velocity=< 3, 5>
|
||||
position=< 40165, -19879> velocity=<-4, 2>
|
||||
position=< 20200, 20157> velocity=<-2, -2>
|
||||
position=< -9859, 10151> velocity=< 1, -1>
|
||||
position=< 20155, -39897> velocity=<-2, 4>
|
||||
position=< 30154, -39901> velocity=<-3, 4>
|
||||
position=< 50207, -49901> velocity=<-5, 5>
|
||||
position=<-29841, -49902> velocity=< 3, 5>
|
||||
position=<-39889, 20158> velocity=< 4, -2>
|
||||
position=< 40173, 30162> velocity=<-4, -3>
|
||||
position=< 30177, 50187> velocity=<-3, -5>
|
||||
position=< 40183, 40179> velocity=<-4, -4>
|
||||
position=< 40219, -29883> velocity=<-4, 3>
|
||||
position=< 40182, -9870> velocity=<-4, 1>
|
||||
position=< -9843, 40179> velocity=< 1, -4>
|
||||
position=<-39866, 30166> velocity=< 4, -3>
|
||||
position=< -9867, -49910> velocity=< 1, 5>
|
||||
position=<-39877, 50189> velocity=< 4, -5>
|
||||
position=<-49879, -9870> velocity=< 5, 1>
|
||||
position=< 50224, -29890> velocity=<-5, 3>
|
||||
position=< 40172, -49901> velocity=<-4, 5>
|
||||
position=< 10151, -39893> velocity=<-1, 4>
|
||||
position=< 20193, 10145> velocity=<-2, -1>
|
||||
position=< 40223, -9868> velocity=<-4, 1>
|
||||
position=<-49911, -19875> velocity=< 5, 2>
|
||||
position=< 30174, 10144> velocity=<-3, -1>
|
||||
position=< 20154, -29883> velocity=<-2, 3>
|
||||
position=<-19844, 30168> velocity=< 2, -3>
|
||||
position=<-19865, -49908> velocity=< 2, 5>
|
||||
position=<-19843, -49909> velocity=< 2, 5>
|
||||
position=< 50171, -49909> velocity=<-5, 5>
|
||||
position=< 30210, 40180> velocity=<-3, -4>
|
||||
position=< -9880, 50180> velocity=< 1, -5>
|
||||
position=<-39870, -19875> velocity=< 4, 2>
|
||||
position=< -9835, 10148> velocity=< 1, -1>
|
||||
position=<-39862, -29888> velocity=< 4, 3>
|
||||
position=< -9833, 30162> velocity=< 1, -3>
|
||||
position=<-39852, -19874> velocity=< 4, 2>
|
||||
position=<-39909, -19879> velocity=< 4, 2>
|
||||
position=<-49903, 40178> velocity=< 5, -4>
|
||||
position=< -9848, 50189> velocity=< 1, -5>
|
||||
position=< -9831, -29891> velocity=< 1, 3>
|
||||
position=<-19880, -39892> velocity=< 2, 4>
|
||||
position=< 50216, -49910> velocity=<-5, 5>
|
||||
position=< 50197, -39898> velocity=<-5, 4>
|
||||
position=<-39897, 50185> velocity=< 4, -5>
|
||||
position=< -9867, -49902> velocity=< 1, 5>
|
||||
position=< 30162, -19874> velocity=<-3, 2>
|
||||
position=<-19875, 40175> velocity=< 2, -4>
|
||||
position=< 10156, -19878> velocity=<-1, 2>
|
||||
position=< -9871, -49906> velocity=< 1, 5>
|
||||
position=<-19880, 30162> velocity=< 2, -3>
|
||||
@@ -0,0 +1,157 @@
|
||||
package main
|
||||
|
||||
import (
|
||||
"flag"
|
||||
"fmt"
|
||||
"math"
|
||||
"strings"
|
||||
"time"
|
||||
|
||||
"github.com/alexchao26/advent-of-code-go/util"
|
||||
)
|
||||
|
||||
func main() {
|
||||
var part int
|
||||
flag.IntVar(&part, "part", 1, "part 1 or 2")
|
||||
flag.Parse()
|
||||
fmt.Println("Running part", part)
|
||||
|
||||
if part == 1 {
|
||||
part1(util.ReadFile("./input.txt"))
|
||||
} else {
|
||||
part2(util.ReadFile("./input.txt"))
|
||||
}
|
||||
}
|
||||
|
||||
func part1(input string) {
|
||||
postions, velocities := parseInputs(input)
|
||||
|
||||
steps := 0
|
||||
|
||||
prints := 0
|
||||
hasPrinted := false
|
||||
for hasLoneIsland(postions) {
|
||||
move(postions, velocities)
|
||||
steps++
|
||||
fmt.Println("\nsteps run", steps)
|
||||
|
||||
printable := printGrid(postions)
|
||||
if printable != "" {
|
||||
fmt.Println("Steps: ", steps)
|
||||
fmt.Println(printable)
|
||||
time.Sleep(time.Millisecond * 500)
|
||||
hasPrinted = true
|
||||
}
|
||||
// stop printing after things have collided
|
||||
if printable == "" && hasPrinted {
|
||||
return
|
||||
}
|
||||
fmt.Println(prints)
|
||||
}
|
||||
}
|
||||
|
||||
func part2(input string) {
|
||||
// Note, reused part 1 with a print for the number of steps
|
||||
part1(input)
|
||||
}
|
||||
|
||||
func parseInputs(input string) (positions [][2]int, velocities [][2]int) {
|
||||
lines := strings.Split(input, "\n")
|
||||
for _, l := range lines {
|
||||
posX := strings.TrimSpace(l[10:16])
|
||||
posY := strings.TrimSpace(l[18:24])
|
||||
velX := strings.TrimSpace(l[36:38])
|
||||
velY := strings.TrimSpace(l[40:42])
|
||||
positions = append(positions, [2]int{util.StrToInt(posX), util.StrToInt(posY)})
|
||||
velocities = append(velocities, [2]int{util.StrToInt(velX), util.StrToInt(velY)})
|
||||
}
|
||||
|
||||
return positions, velocities
|
||||
}
|
||||
|
||||
// this didn't work unfortunately, letters like K do have "lone islands" along
|
||||
// the diagonals
|
||||
func hasLoneIsland(grid [][2]int) bool {
|
||||
coords := map[[2]int]bool{}
|
||||
// generate map
|
||||
for _, pos := range grid {
|
||||
coords[pos] = true
|
||||
}
|
||||
|
||||
// iterate through coords again and check if each has a neighbor in the map
|
||||
delta := [][2]int{
|
||||
{-1, 0},
|
||||
{1, 0},
|
||||
{0, -1},
|
||||
{0, 1},
|
||||
}
|
||||
for _, pos := range grid {
|
||||
hasNeighbor := false
|
||||
for _, d := range delta {
|
||||
pos[0] += d[0]
|
||||
pos[1] += d[1]
|
||||
|
||||
if coords[pos] {
|
||||
hasNeighbor = true
|
||||
}
|
||||
|
||||
pos[0] -= d[0]
|
||||
pos[1] -= d[1]
|
||||
}
|
||||
if !hasNeighbor {
|
||||
return true // there is a lone island
|
||||
}
|
||||
}
|
||||
return false
|
||||
}
|
||||
|
||||
func move(positions [][2]int, velocities [][2]int) {
|
||||
for i := range positions {
|
||||
positions[i][0] += velocities[i][0]
|
||||
positions[i][1] += velocities[i][1]
|
||||
}
|
||||
}
|
||||
|
||||
func printGrid(positions [][2]int) string {
|
||||
// get bounds
|
||||
left := math.MaxInt16
|
||||
right := -math.MaxInt16
|
||||
top := math.MaxInt16
|
||||
bottom := -math.MaxInt16
|
||||
|
||||
coords := map[[2]int]bool{}
|
||||
|
||||
for _, p := range positions {
|
||||
coords[p] = true
|
||||
|
||||
if p[0] < top {
|
||||
top = p[0]
|
||||
}
|
||||
if p[0] > bottom {
|
||||
bottom = p[0]
|
||||
}
|
||||
if p[1] < left {
|
||||
left = p[1]
|
||||
}
|
||||
if p[1] > right {
|
||||
right = p[1]
|
||||
}
|
||||
}
|
||||
|
||||
if right-left > 20 && bottom-top > 20 {
|
||||
return ""
|
||||
}
|
||||
|
||||
ans := ""
|
||||
for row := top; row <= bottom; row++ {
|
||||
for col := left; col <= right; col++ {
|
||||
if coords[[2]int{row, col}] {
|
||||
ans += "0"
|
||||
} else {
|
||||
ans += " "
|
||||
}
|
||||
}
|
||||
ans += "\n"
|
||||
}
|
||||
return ans
|
||||
}
|
||||
@@ -0,0 +1,78 @@
|
||||
/*
|
||||
NOTE This is not an easily testable problem, these tests are for helper functions
|
||||
*/
|
||||
|
||||
package main
|
||||
|
||||
import (
|
||||
"testing"
|
||||
)
|
||||
|
||||
func TestHasLoneIsland(t *testing.T) {
|
||||
tests := []struct {
|
||||
name string
|
||||
grid [][2]int
|
||||
want bool
|
||||
}{
|
||||
{"simple_all_one_island", [][2]int{
|
||||
{1, 1},
|
||||
{1, 2},
|
||||
{2, 2},
|
||||
{2, 1},
|
||||
}, false},
|
||||
{"simple_has_lone_cell", [][2]int{
|
||||
{1, 1},
|
||||
{1, 2},
|
||||
{2, 2},
|
||||
{2, 1},
|
||||
{4, 1},
|
||||
}, true},
|
||||
}
|
||||
for _, tt := range tests {
|
||||
t.Run(tt.name, func(t *testing.T) {
|
||||
if got := hasLoneIsland(tt.grid); got != tt.want {
|
||||
t.Errorf("hasLoneIsland() = %v, want %v", got, tt.want)
|
||||
}
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
func TestPrintGrid(t *testing.T) {
|
||||
tests := []struct {
|
||||
name string
|
||||
positions [][2]int
|
||||
want string
|
||||
}{
|
||||
{"horizontal line", [][2]int{
|
||||
{0, 0},
|
||||
{0, 1},
|
||||
{0, 2},
|
||||
{0, -1},
|
||||
}, "0000\n"},
|
||||
{"horizontal line with gap", [][2]int{
|
||||
{0, 0},
|
||||
{0, 1},
|
||||
{0, 2},
|
||||
{0, -1},
|
||||
{0, -4},
|
||||
{0, -5},
|
||||
}, "00 0000\n"},
|
||||
{"box", [][2]int{
|
||||
{0, 0},
|
||||
{0, 1},
|
||||
{0, 2},
|
||||
{1, 0},
|
||||
{2, 0},
|
||||
{2, 1},
|
||||
{2, 2},
|
||||
{1, 2},
|
||||
}, "000\n0 0\n000\n"},
|
||||
}
|
||||
for _, tt := range tests {
|
||||
t.Run(tt.name, func(t *testing.T) {
|
||||
if got := printGrid(tt.positions); got != tt.want {
|
||||
t.Errorf("printGrid() = %q, want %q", got, tt.want)
|
||||
}
|
||||
})
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user