EqualPairs

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

namespace EqualPairs
{
    class EqualPairs
    {
        static void Main()
        {
            int numberOfPairs = int.Parse(Console.ReadLine());

            int currSum = 0;
            int prevSum = 0;
            bool sumsAreDifferent = false;
            int maxDiff = int.MinValue;
            for (int currPair = 0; currPair < numberOfPairs; currPair++)
            {
                prevSum = currSum;

                int firstNum = int.Parse(Console.ReadLine());
                int secondNum = int.Parse(Console.ReadLine());

                currSum = firstNum + secondNum;

                int currDiff = 0;
                if (currPair >= 1 && currSum != prevSum)
                {
                    sumsAreDifferent = true;

                    currDiff = Math.Abs(currSum - prevSum);
                }

                if (sumsAreDifferent && currDiff > maxDiff)
                {
                    maxDiff = currDiff;
                }
            }

            if (!sumsAreDifferent)
            {
                Console.WriteLine($"Yes, value={currSum}");
            }
            else
            {
                Console.WriteLine($"No, maxdiff={maxDiff}");
            }
        }
    }
}