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day6.go
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day6.go
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package main
import (
"regexp"
"strings"
"utils"
)
const gridSize = 1000
type grid [gridSize][gridSize]int
type mode int
const (
off mode = 0
on mode = 1
toggle mode = 2
)
func parseMode(s string) (m mode) {
if strings.Contains(s, "turn on") {
m = on
} else if strings.Contains(s, "toggle") {
m = toggle
} else if strings.Contains(s, "turn off") {
m = off
}
return
}
var coordRegex = regexp.MustCompile("(\\d+),(\\d+) .* (\\d+),(\\d+)")
func parseCoords(s string) (int, int, int, int) {
m := coordRegex.FindStringSubmatch(s)
coords := utils.StringsToInts(m[1:])
return coords[0], coords[1], coords[2], coords[3]
}
func applyMode(prev int, m mode, brightnessControl bool) (new int) {
if brightnessControl {
switch m {
case toggle:
new = prev + 2
case on:
new = prev + 1
case off:
new = prev - 1
if new < 0 {
new = 0
}
}
} else {
switch m {
case toggle:
new = prev ^ 1
case on, off:
new = int(m)
}
}
return
}
func run(filepath string, brightnessControl bool) (lit int) {
var g grid
lines := utils.ReadFileToLines(filepath)
for _, l := range lines {
selectedMode := parseMode(l)
x1, y1, x2, y2 := parseCoords(l)
for y := y1; y <= y2; y++ {
for x := x1; x <= x2; x++ {
g[y][x] = applyMode(g[y][x], selectedMode, brightnessControl)
}
}
}
for y := 0; y < gridSize; y++ {
for x := 0; x < gridSize; x++ {
lit += g[y][x]
}
}
return
}
func main() {
}