Kertotaulu

#include<iostream>
#include<vector>
#include<map>
#include<set>
#include<algorithm>
#include<cmath>
#include<utility>

using namespace std;

int main(void) {
  const int64_t MOD=1000000007;
  int64_t x1,y1,x2,y2;
  cin >> y1 >> x1 >> y2 >> x2;
  int64_t res=(y2*(y2+1)%MOD - (y1-1)*y1%MOD)%MOD*(MOD+1)/2%MOD*(x2*(x2+1)%MOD - (x1-1)*x1%MOD)%MOD*(MOD+1)/2%MOD;
  if(res < 0) res+=MOD;
  cout << res << endl;
  return 0;
}

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