Even Pairs

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int n = Integer.parseInt(scanner.nextLine());
        // For this problem, since we will be comparing two pairs at one time, we will be using two sums:
        int sum1 = 0;
        int sum2 = 0;


        // We'll also have a variable for the max difference since if they aren't all equal we will need it:
        int maxDifference = 0;

        for (int i = 0; i < n; i++) {
            // In a single for loop we are reading a pair with each iteration:
            int num1 = Integer.parseInt(scanner.nextLine());
            int num2 = Integer.parseInt(scanner.nextLine());

            // On each even iteration (0, 2, 4...) we will be changing the first sum:
            if (i % 2 == 0){
                sum1 = num1 + num2;
            }else{ // On each odd iteration we'll be changing the second one:
                sum2 = num1 + num2;
            }

            // This variable will keep the current difference between the pairs:
            int difference = 0;

            // We check whether the sums aren't equal. Notice the first condition (i != 0) - it's important to have it,
            // since otherwise we will be comparing the first sum with 0, since the second sum won't be changed yet:
            if (i != 0 && sum1 != sum2){
                // The difference is calculated with the help of the abs method since we don't know which sum is bigger:
                difference = Math.abs(sum1 - sum2);
                // Then if the current difference is bigger than the maximum difference, we change its value:
                if (difference != 0 && difference > maxDifference){
                    maxDifference = difference;
                }
            }
        }

        // Print the results:
        // If the maxDifference is still 0, as we initialized it, then all pairs were equal:
        if (maxDifference == 0){
            System.out.printf("Yes, value=%d", sum1);
        }
        else{
            System.out.printf("No, maxdiff=%d", maxDifference);
        }

    }
}