future.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Math;

public class Point(double x, double y)
{
	public double X { get; } = x;
	public double Y { get; } = y;
	
	public double DistanceTo(Point other) => Sqrt(Pow(X - other.X, 2) + Pow(Y - other.Y, 2));
}

class Program
{
	static void Main()
	{
		var points = new List { new Point(0, 0), new Point(1, 1,), new Point(2, 2) };
		var totalDistance = points.Zip(points.Skip(1), (lhs, rhs) => lhs.DistanceTo(rhs)).Sum();
		
		Console.WriteLine(totalDistance);
	}
}