869B Codeforces - The eternal immortality

869B Codeforces - The eternal immortality

Link ; http://codeforces.com/problemset/problem/869/B

Solution in C++

#include <bits/stdc++.h>

using namespace std;

#define pii pair<int,int>
typedef long long int lli;

lli n,m,sol=1;

int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);cout.tie(0);
    cin>>n>>m;
    if(n>m)swap(n,m);
    if( ((n%10)+1<=2 && n%10>=1 && m%10>=5) || (abs(n-m)>10) )return cout<<0,0;
    else{
        for(lli i=n+1;i<=m;i++)
            sol=(sol*(i%10))%10;
    }
    cout<<sol;
    return 0;
}

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About Mohamed Sobhi

My name is Mo.Sobhy ,I study at School excelling high school in Ain Shams ,Cairo
My hobbies is programming ,and web development ,playing chess and writing horror stories.