View difference between Paste ID: CgcJDm6v and AnFBkSjL

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 
 class HalfSum
 {
     static void Main()
     {
         int n, firstNumber, secondNumber;
         int firstSum = 0;
         int secondSum = 0;
         do
         {
             n = int.Parse(Console.ReadLine());
         } while ((n >= 0)^(n <= 500));
         for (int i = 0; i < n; i++)
         {
             do
             {
                 firstNumber = int.Parse(Console.ReadLine());
             } while ((firstNumber >= -500000)^(firstNumber <= 500000));
             do
             {
                 secondNumber = int.Parse(Console.ReadLine());
             } while ((secondNumber >= -500000) ^ (secondNumber <= 500000));
             firstSum += firstNumber;
             secondSum += secondNumber;
         }
         if (firstSum == secondSum)
         {
             Console.WriteLine("Yes, sum="+ firstSum);
         }
         else
         {
             int difference;
             if (firstSum > secondSum)
             {
                 difference = firstSum - secondSum;
             }
             else
             {
                 difference = secondSum - firstSum;
             }
             Console.WriteLine("No, diff="+difference);
         }
     }
 }