EqualPairs

using System;

namespace EqualPairs
{
    class Program
    {
        public static void Main(string[] args)
        {
            int num;

            if (int.TryParse(Console.ReadLine(),out num))
            {
                    int sum = 0;
                    int previouSum = 0;
                    int maxDiff = 0;
                for (int i = 0; i < 2*num; i++)
                {
                        string s = Console.ReadLine();
                        string [] values = s.Split(' ');
                        int a = int.Parse(values[i]);
                        int b = int.Parse(values[i+1]);
                        int c = int.Parse(values[i+2]);
                        int d = int.Parse(values[i+3]);
                        sum = c+d;
                        previouSum = a+b;
                        if (i>1) {
                            if (sum-previouSum==0) {
                                Console.WriteLine("Yes, value={0}",sum);
                            }
                            else {
                                maxDiff = sum-previouSum;
                                Console.WriteLine("No, maxdiff={0}",Math.Abs(maxDiff));
                            }
                        }
                        else {

                        }
                }
            }
        }
    }
}