#include <bits/stdc++.h>

using namespace std;

bool overflow(long long int a, long long int b){
    long long int c = a*b;
    cout<<a<<" "<<b<<" "<<c<<" "<<c/a<<" "<<c/b<<endl;
    return (c/b) != a;
}

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    long long int a = 847288609443LL; // 3^25
    cout<<overflow(a, a)<<endl;
}

When I run the above code in my PC I get the following output...

847288609443 847288609443 6048575297968530377 7138742 7138742
1

But when I run it on codeforces I get the following output....

847288609443 847288609443 6048575297968530377 7138742 847288609443
0

What could be the problem here? Btw Why c/a and c/b different in codeforces output though a and b have same value?

Please help me out.