private static int FindPixelsOnAfter(string[] input, int steps)
{
var mappings = new Enhancements(input);
var pattern = ".#./..#/###".Split('/').ToCharMatrix();
for (var loop = 0; loop < steps; loop++)
{
var w = pattern.Width();
var dim = w % 2 == 0 ? 2 : 3;
var newdim = dim + 1;
var n = w / dim; // n is number of new squares across or down (same number)
var nextPattern = new char[n * newdim, n *newdim];
for (var i = 0; i < n; i++)
{
for (var j = 0; j < n; j++)
{
var part = pattern.CopyPart(i * dim, j * dim, dim, dim);
var replacement = mappings.Enhance(part);
nextPattern.PastePart(i * newdim, j * newdim, replacement);
}
}
pattern = nextPattern;
}
var pixelsOn = pattern.CountChar('#');
return(pixelsOn);
}