Kertotaulu

#include <iostream>

using namespace std;

unsigned long long s(unsigned long long a, unsigned long long b){
  return (a+b)*(b-a+1)/2;
}


int main(){
  ios_base::sync_with_stdio(0); cin.tie(0);
  
  unsigned long long x1, x2, y1, y2;
  cin >> y1 >> x1 >> y2 >> x2;
  cout << ((s(y1, y2)%1000000007)*(s(x1, x2)%1000000007))%1000000007 << endl;
}

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