using System;
using System.Collections.Generic;

namespace Variant5
{
    class Program
    {
        static Random rnd = new Random();
        static void Main()
        {
            do
            {
                int n;
                do
                {
                    Console.WriteLine("Введите целую неотрицательную длинну массива");
                } while (!int.TryParse(Console.ReadLine(), out n) || (n <= 0));

                List<Vector> vectors = CreateList(n);

                Vector q = CreateQ();

                List<Vector> collVectors = GetCollList(vectors, q);
                if (collVectors.Count == 0)
                {
                    Console.WriteLine("Коллиниарные векторы не обнаружены");
                }
                else
                {
                    PrintList(vectors);
                    Console.WriteLine();
                    PrintList(collVectors);
                }

                Console.WriteLine("Введите ESC, чтобы закончить...");
            } while (Console.ReadKey(true).Key != ConsoleKey.Escape);
        }

        static List<Vector> CreateList(int n)
        {
            List<Vector> vectors = new List<Vector>();
            for (int i = 0; i < n; i++)
            {
                int x1 = rnd.Next(0, 11);
                int y1 = rnd.Next(0, 11);
                int x2 = rnd.Next(0, 11);
                int y2 = rnd.Next(0, 11);
                Vector vector = new Vector(x1, y1, x2, y2);
                vectors.Add(vector);
            }
            return vectors;
        }

        static Vector CreateQ()
        {
            int x;
            int y;
            do
            {
                Console.WriteLine("Задайте ненулевой вектор");
                do
                {
                    Console.WriteLine("Введите координату вектора Х");
                } while (!int.TryParse(Console.ReadLine(), out x));
                do
                {
                    Console.WriteLine("Введите координату вектора Y");
                } while (!int.TryParse(Console.ReadLine(), out y));
            } while ((x == 0) && (y == 0));

            Vector q = new Vector(x, y);
            return q;
        }

        static List<Vector> GetCollList(List<Vector> vectors, Vector q)
        {
            List<Vector> collVectors = new List<Vector>();

            foreach (Vector vector in vectors)
            {
                if (vector.IsCollinearity(q))
                {
                    collVectors.Add(vector);
                }
            }

            return collVectors;
        }

        static void PrintList(List<Vector> vectors)
        {
            foreach (Vector vector in vectors)
            {
                Console.WriteLine(vector);
            }
        }
    }

    class Vector
    {
        private int x1;
        private int y1;
        private int x2;
        private int y2;
        private int x;
        private int y;

        public Vector(int x, int y)
        {
            this.x = x;
            this.y = y;
        }

        public Vector(int x1, int y1, int x2, int y2)
        {
            this.x1 = x1;
            this.y1 = y1;
            this.x2 = x2;
            this.y2 = y2;

            x = x2 - x1;
            y = y2 - y1;
        }

        public int X => x;

        public int Y => y;

        public double VectorLength
        {
            get
            {
                return Math.Sqrt(Math.Pow(x, 2) + Math.Pow(x, 2));
            }
        }

        public bool IsCollinearity(Vector vector)
        {
            if (x != 0 && y != 0)
            {
                return (this.x * vector.Y == this.y * vector.X);
            }
            return false;
        }

        public override string ToString()
        {
            return $"X = {x}\t Y = {y}\t Length = {this.VectorLength}";
        }
    }
}