70 lines
1.6 KiB
Go
70 lines
1.6 KiB
Go
package main
|
|
|
|
import (
|
|
"fmt"
|
|
|
|
h "git.bullercodeworks.com/brian/adventofcode/helpers"
|
|
)
|
|
|
|
func main() {
|
|
inp := h.StdinToString()
|
|
rocks := [][]h.Coordinate{
|
|
{{X: 0, Y: 0}, {X: 1, Y: 0}, {X: 2, Y: 0}, {X: 3, Y: 0}},
|
|
{{X: 1, Y: 2}, {X: 0, Y: 1}, {X: 1, Y: 1}, {X: 2, Y: 1}, {X: 1, Y: 0}},
|
|
{{X: 2, Y: 2}, {X: 2, Y: 1}, {X: 0, Y: 0}, {X: 1, Y: 0}, {X: 2, Y: 0}},
|
|
{{X: 0, Y: 3}, {X: 0, Y: 2}, {X: 0, Y: 1}, {X: 0, Y: 0}},
|
|
{{X: 0, Y: 1}, {X: 1, Y: 1}, {X: 0, Y: 0}, {X: 1, Y: 0}},
|
|
}
|
|
grid := map[h.Coordinate]struct{}{}
|
|
move := func(rock []h.Coordinate, delta h.Coordinate) bool {
|
|
nrock := make([]h.Coordinate, len(rock))
|
|
for i, p := range rock {
|
|
p = p.Add(delta)
|
|
if _, ok := grid[p]; ok || p.X < 0 || p.X >= 7 || p.Y < 0 {
|
|
return false
|
|
}
|
|
nrock[i] = p
|
|
}
|
|
copy(rock, nrock)
|
|
return true
|
|
}
|
|
cache := map[[2]int][]int{}
|
|
|
|
height, jet := 0, 0
|
|
for i := 0; i < 1000000000000; i++ {
|
|
if i == 2022 {
|
|
fmt.Println("# Part 1")
|
|
fmt.Println(height)
|
|
fmt.Println()
|
|
}
|
|
k := [2]int{i % len(rocks), jet}
|
|
if c, ok := cache[k]; ok {
|
|
if n, d := 1000000000000-i, i-c[0]; n%d == 0 {
|
|
fmt.Println("# Part 2")
|
|
fmt.Println(height + n/d*(height-c[1]))
|
|
break
|
|
}
|
|
}
|
|
cache[k] = []int{i, height}
|
|
|
|
rock := []h.Coordinate{}
|
|
for _, p := range rocks[i%len(rocks)] {
|
|
rock = append(rock, p.Add(h.Coordinate{X: 2, Y: height + 3}))
|
|
}
|
|
for {
|
|
move(rock, h.Coordinate{X: int(inp[jet]) - int('='), Y: 0})
|
|
jet = (jet + 1) % len(inp)
|
|
|
|
if !move(rock, h.Coordinate{X: 0, Y: -1}) {
|
|
for _, p := range rock {
|
|
grid[p] = struct{}{}
|
|
if p.Y+1 > height {
|
|
height = p.Y + 1
|
|
}
|
|
}
|
|
break
|
|
}
|
|
}
|
|
}
|
|
}
|