private static LicenseNode GetNode(EnumerableReader <int> input)
{
var numChildren = input.TakeFirst();
var numMetadata = input.TakeFirst();
var children = new LicenseNode[numChildren];
for (int i = 0; i < numChildren; i++)
{
children[i] = GetNode(input);
}
return(new LicenseNode(children, input.TakeN(numMetadata)));
}
