We invite you to participate in CodeChef’s Starters 14 this Wednesday, September 29th, rated for division 3 coders.

Time: 8 PM — 11 PM IST.

Joining me on the problem setting panel are:

• Setters: Utkarsh Utkarsh.25dec Gupta, Soumyadeep soumyadeep_pal_21 Pal, Daanish Mahajan, Aryan Agarwala, Mradul bhatnagar.mradul Bhatnagar

• Contest Admins: Utkarsh Utkarsh.25dec Gupta, Surya evilbuggy Prakash

• Tester: Manan mexomerf Grover

• Statement Verifier: Sarthak SarthakAjmera Ajmera

• Editorialist: Ajit Sharma ajit Kasturi

• Video Editorialists: Chirayu Chirayu Jain, Prachi agarwal19 Agarwal, Darshan darshancool25 Lokhande, Yashodhan ay21 Agnihotri, Shivam Bohra, Aryan Agarwala, Meet myth_gemphir Singh Gambhir, Rajarshi RestingRajarshi Basu, Bharat Singla

The video editorials of the problems will be available on our YouTube channel as soon as the contest ends. Subscribe to get notifications about our new editorials.

Also, if you have some original and engaging problem ideas, and you’re interested in them being used in CodeChef's contests, you can share them here.

Hope to see you participating.

Good Luck!

#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.

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My first blog post :) Any constructive feedback is welcome.