kusac

#include <bits/stdc++.h>
#define ll long long
#define INF 999999999
#define N (1<<17)
#define M 1000000007

using namespace std;

int gcd(int a, int b) {
 if (!b) return a;
return gcd(b, a % b); 
}

int main () {
  int n, m;
  cin>>n>>m;
  if (n == m) cout<<0<<endl;
  else if (n < m) {
    int ans = n * (m % n);
    m -= m % n;
    if (n == m) cout<<ans<<endl;
    else {
	m /= n;
	ans += n * m - n;
	cout<<ans<<endl;
    }
  } else {
    n = n % m;
    if (!n) cout<<0<<endl, exit(0);
    int ans = n * (m % n);
    m -= m % n;
    if (n == m) cout<<ans<<endl;
    else {
	m /= n;
	ans += n * m - n;
	cout<<ans<<endl;
    }
  }
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: WRONG ANSWER

Test 9

Verdict: ACCEPTED

Test 10

Verdict: WRONG ANSWER

Test 11

Verdict: WRONG ANSWER