public static void part1()
{
var lights = Enumerable.Repeat(false, 1000 * 1000).ToArray();
string[] instructions = Problem06.text();
var regex = new Regex("(?<action>turn on|turn off|toggle) (?<minX>\\d*),(?<minY>\\d*) through (?<maxX>\\d*),(?<maxY>\\d*)");
foreach (var instruction in instructions)
{
var groups = regex.Matches(instruction)[0].Groups;
for (var x = int.Parse(groups["minX"].Value); x <= int.Parse(groups["maxX"].Value); x += 1)
{
for (var y = int.Parse(groups["minY"].Value); y <= int.Parse(groups["maxY"].Value); y += 1)
{
int index = 1000 * x + y;
switch (groups["action"].Value)
{
case "turn on": lights[index] = true; break;
case "turn off": lights[index] = false; break;
case "toggle": lights[index] = !lights[index]; break;
}
}
}
}
Console.WriteLine(lights.Count(light => light == true));
}
public static void part2()
{
var lights = Enumerable.Repeat(0, 1000 * 1000).ToArray();
string[] instructions = Problem06.text();
var regex = new Regex("(?<action>turn on|turn off|toggle) (?<minX>\\d*),(?<minY>\\d*) through (?<maxX>\\d*),(?<maxY>\\d*)");
foreach (var instruction in instructions)
{
var groups = regex.Matches(instruction)[0].Groups;
for (var x = int.Parse(groups["minX"].Value); x <= int.Parse(groups["maxX"].Value); x += 1)
{
for (var y = int.Parse(groups["minY"].Value); y <= int.Parse(groups["maxY"].Value); y += 1)
{
int index = 1000 * x + y;
switch (groups["action"].Value)
{
case "turn on": lights[index] += 1; break;
case "turn off": lights[index] = Math.Max(0, lights[index] - 1); break;
case "toggle": lights[index] += 2; break;
}
}
}
}
var brightness = 0;
foreach (var light in lights)
{
brightness += light;
}
Console.WriteLine(brightness);
}