72 lines
990 B
Go
72 lines
990 B
Go
package aoc2015
|
|
|
|
import (
|
|
"aoc/internal/utility"
|
|
"errors"
|
|
"fmt"
|
|
)
|
|
|
|
func day03part1(in string) {
|
|
var x, y int
|
|
houses := make(map[utility.Point]int)
|
|
houses[utility.NewPoint(0, 0)]++
|
|
|
|
for _, c := range in {
|
|
switch c {
|
|
case '<':
|
|
x--
|
|
case '>':
|
|
x++
|
|
case 'v':
|
|
y--
|
|
case '^':
|
|
y++
|
|
default:
|
|
utility.E(errors.New("unknown input"))
|
|
}
|
|
houses[utility.NewPoint(x, y)]++
|
|
}
|
|
fmt.Println(len(houses))
|
|
}
|
|
|
|
func day03part2(in string) {
|
|
var (
|
|
sx, sy, rx, ry int
|
|
x, y *int
|
|
)
|
|
houses := make(map[utility.Point]int)
|
|
houses[utility.NewPoint(0, 0)]++
|
|
|
|
for i, c := range in {
|
|
if i%2 == 0 {
|
|
x = &sx
|
|
y = &sy
|
|
} else {
|
|
x = &rx
|
|
y = &ry
|
|
}
|
|
|
|
switch c {
|
|
case '<':
|
|
*x--
|
|
case '>':
|
|
*x++
|
|
case 'v':
|
|
*y--
|
|
case '^':
|
|
*y++
|
|
default:
|
|
utility.E(errors.New("unknown input"))
|
|
}
|
|
|
|
houses[utility.NewPoint(*x, *y)]++
|
|
}
|
|
fmt.Println(len(houses))
|
|
}
|
|
|
|
func day03() {
|
|
in := utility.GetInput("input/2015/03")
|
|
day03part1(in)
|
|
day03part2(in)
|
|
}
|