using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

//using System.Drawing;

namespace LambdaForSort
{

    struct Point
    {
        public int X, Y;
        public Point(int X, int Y)
        {
            this.X = X;
            this.Y = Y;
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            List<Point> Pts = new List<Point>();
            Random R = new Random(0);
            const int N = 8;

            Pts.Add(new Point(100, 101));

            for (int i = 0; i < 16; i++)
            {
                Pts.Add(new Point(R.Next(N), R.Next(N)));
            }
            Pts.Add(new Point(100, 99));
            
            Console.Write("Orignal:");
            
            foreach (Point P in Pts)
            {
                Console.Write("[{0},{1}] ", P.X, P.Y);
            }

            Console.WriteLine();
            Pts.Sort((P1, P2) =>
            {
                if (P1.X > P2.X) return 1;
                if (P1.X < P2.X) return -1;
                if (P1.Y > P2.Y) return 1;
                if (P1.Y < P2.Y) return -1;
                return 0;
            });

            Console.Write("Sorted:");
            
            foreach (Point P in Pts)
            {
                Console.Write("[{0},{1}] ", P.X, P.Y);
            }

            return;
        }
    }
}