private NestedInteger ParseList(string s, ref int index)
{
Debug.Assert(s[index] == '[');
index++; // eat '['
NestedInteger root = new NestedInteger();
while (index < s.Length)
{
char c = s[index];
if (c == '[')
{
root.Add(ParseList(s, ref index));
}
else if (('0' <= c && c <= '9') || c == '-')
{
root.Add(ParseNumber(s, ref index));
}
else if (c == ',')
{
// skip
index++;
}
else if (c == ']')
{
break;
}
else
{
throw new Exception();
}
}
Debug.Assert(s[index] == ']');
index++; // eat ']'
return(root);
}
// Set this NestedInteger to hold a nested list and adds a nested integer to it.
public void Add(NestedInteger ni)
{
_value = null;
_children.Add(ni);
}