54 lines
1.0 KiB
Go
54 lines
1.0 KiB
Go
package main
|
|
|
|
import (
|
|
"fmt"
|
|
|
|
h "git.bullercodeworks.com/brian/adventofcode/helpers"
|
|
)
|
|
|
|
func main() {
|
|
inp := h.StdinToStringSlice()
|
|
solve(inp)
|
|
}
|
|
|
|
var (
|
|
N = h.Coordinate{X: 0, Y: -1}
|
|
E = h.Coordinate{X: 1, Y: 0}
|
|
S = h.Coordinate{X: 0, Y: 1}
|
|
W = h.Coordinate{X: -1, Y: 0}
|
|
Dirs = []h.Coordinate{N, E, S, W}
|
|
)
|
|
|
|
func solve(inp []string) {
|
|
m := h.StringSliceToCoordByteMap(inp)
|
|
start, _ := m.FindFirst('S')
|
|
// Find the path through the map
|
|
queue, dist := []h.Coordinate{start}, map[h.Coordinate]int{start: 0}
|
|
for len(queue) > 0 {
|
|
p := queue[0]
|
|
queue = queue[1:]
|
|
for _, d := range Dirs {
|
|
n := p.Add(d)
|
|
if _, ok := dist[n]; !ok && m.Get(n) != '#' {
|
|
queue, dist[n] = append(queue, n), dist[p]+1
|
|
}
|
|
}
|
|
}
|
|
part1, part2 := 0, 0
|
|
for p1 := range dist {
|
|
for p2 := range dist {
|
|
d := p1.Distance(p2)
|
|
if d <= 20 && dist[p2] >= dist[p1]+d+100 {
|
|
if d <= 2 {
|
|
part1++
|
|
}
|
|
part2++
|
|
}
|
|
}
|
|
}
|
|
fmt.Println("# Part 1")
|
|
fmt.Println(part1)
|
|
fmt.Println("\n# Part 2")
|
|
fmt.Println(part2)
|
|
}
|