Kertotaulu

import java.util.Scanner;


public class Kertotaulu {
	public static void main(String[] args) {
		final int modulo = 1000000007;

		Scanner input = new Scanner(System.in);

		final int y1 = input.nextInt();
		final int x1 = input.nextInt();
		final int y2 = input.nextInt();
		final int x2 = input.nextInt();
		
		boolean korkeusPariton, leveysPariton;
		long korkeus, leveys, leveysSumma, korkeusSumma;

		
		leveys = x2-x1;
		leveysPariton = (leveys%2==0);
		leveysSumma = ((leveys)/2+((leveysPariton)?0:1)) * (x1 + x2) + ((leveysPariton)?((x1+x2)/2):0);
		
		korkeus = y2-y1;
		korkeusPariton = (korkeus%2==0);
		korkeusSumma = ((korkeus)/2+((korkeusPariton)?0:1)) * (y1 + y2) + ((korkeusPariton)?((y1+y2)/2):0);
		
		System.out.println(((leveysSumma%modulo) * (korkeusSumma%modulo))%modulo);

	}
}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 1

Verdict: ACCEPTED

Test 3

Group: 1

Verdict: ACCEPTED

Test 4

Group: 1

Verdict: ACCEPTED

Test 5

Group: 1

Verdict: ACCEPTED

Test 6

Group: 2

Verdict: ACCEPTED

Test 7

Group: 2

Verdict: ACCEPTED

Test 8

Group: 2

Verdict: ACCEPTED

Test 9

Group: 2

Verdict: ACCEPTED

Test 10

Group: 2

Verdict: ACCEPTED

Test 11

Group: 3

Verdict: ACCEPTED

Test 12

Group: 3

Verdict: ACCEPTED

Test 13

Group: 3

Verdict: ACCEPTED

Test 14

Group: 3

Verdict: ACCEPTED

Test 15

Group: 3

Verdict: ACCEPTED