public static object[] Unflatten(int[] flatArray)
{
var list = new List <object>();
var stack = new Stack <int>(flatArray.Reverse());
while (stack.Count > 0)
{
var number = stack.First();
if (number < 3)
{
list.Add(number);
stack.Pop();
}
else
{
if (number > stack.Count)
{
number = stack.Count;
}
list.Add(stack.Take(number).ToArray());
for (int i = 0; i < number; i++)
{
stack.Pop();
}
}
}
return(list.ToArray());
}
