public ulong part_one(string input)
{
var numbers = input.Lines(BinaryNumber.Parse).ToArray();
var size = numbers[0].Size;
var threshold = numbers.Length / 2;
var gamma = BinaryNumber.Empty(size);
var epsilon = BinaryNumber.Empty(size);
for (var position = 0; position < size; position++)
{
var ones = numbers.Count(line => line.HasFlag(position));
if (ones > threshold)
{
gamma = gamma.Flag(position);
}
else
{
epsilon = epsilon.Flag(position);
}
}
return(gamma.Value * epsilon.Value);
}