static int Main(string[] Args)
{
// Read data from input file
string s;
List <double> x = new List <double>();
List <double> y = new List <double>();
do
{
s = ReadLine();
if (s != null)
{
string[] words = s.Split('\t');
x.Add(double.Parse(words[0]));
y.Add(double.Parse(words[1]));
}
}while(s != null);
// Make cubic spline
CubicSpline Spline = new CubicSpline(x, y);
// Write data
double eps = 1.0 / 8;
for (double z = x[0]; z <= x[x.Count - 1]; z += eps)
{
WriteLine(
$"{z} {Spline.spline(z)} {Spline.derivative(z)} {Spline.integral(z)}");
}
return(0);
}