public override void First()
{
var img = new SiImage("Day8/image.txt", 25, 6);
var minzerolayer = img.layers
.Select(l => new { layer = l, zeroes = l.Where(p => p == '0').Count() })
.OrderBy(l => l.zeroes).First().layer;
var onesandtwos = minzerolayer.Count(l => l == '1') * minzerolayer.Count(l => l == '2');
Echo($"#1s * #2s: {onesandtwos}");
ValidateAnswer(onesandtwos, 1742);
}
public override void Second()
{
var img = new SiImage("Day8/image.txt", 25, 6);
var merged = new char[img.width * img.height];
for (int i = 0; i < img.width * img.height; i++)
{
foreach (var layer in img.layers)
{
merged[i] = layer[i];
if (layer[i] == '1' || layer[i] == '0')
{
break;
}
}
}
for (int i = 0; i < img.height; i++)
{
Echo($"{merged.Skip(i * img.width).Take(img.width).Aggregate("", (str, c) => str+(c=='0'?' ':'*'))}");
}
}