Problem 33. Equal Pairs 100%

using System;

class EqualPairs
{
    static void Main(string[] args)
    {
        long n = long.Parse(Console.ReadLine());

        long currentSum = 0;
        long previousSum = 0;
        long diff = 0;
        long maxDiff = 0;
        for (long i = 0; i < n; i++)
        {
            previousSum = currentSum;
            currentSum = 0;
            currentSum += long.Parse(Console.ReadLine());
            currentSum += long.Parse(Console.ReadLine());
            if (i != 0)
            {
                diff = Math.Abs(currentSum - previousSum);
                if (diff != 0 && diff > maxDiff)
                {
                    maxDiff = diff;
                }
            }
        }
        if (previousSum == currentSum || n == 1)
        {
            Console.WriteLine($"Yes, value={currentSum}");

        }
        else
        {
            Console.WriteLine("No, maxdiff={0}", maxDiff);
        }
    }
}