Codeforces Round #282 (Div. 2) (B. Modular Equations)

Bismillahir Rahmanir Rahim

///Author: Tanvir Ahmmad
///CSE,Islamic University,Bangladesh

#include<iostream>
#include<cstdio>
#include<algorithm>
#include<string>
#include<cstring>
#include<sstream>
#include<cmath>
#include<cstring>
#include<vector>
#include<queue>
#include<map>
#include<set>
#include<stack>
#include<vector>
#include<iterator>
#include <functional> ///sort(arr,arr+n,greater<int>()) for decrement of array
/*every external angle sum=360 degree
  angle find using polygon hand(n) ((n-2)*180)/n*/
///Floor[Log(b)  N] + 1 = the number of digits when any number is represented in base b
using namespace std;
typedef long long ll;

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    ll a,b;
    cin>>a>>b;
    set<ll>st;
    if(a>b)
    {
        a-=b;
        for(ll i=1; i*i<=a; i++)
            if(a%i==0)
            {
                if(i>b)
                    st.insert(i);
                if((a/i)>b)
                    st.insert(a/i);
            }
        cout<<st.size()<<endl;
    }
    else if(a==b) cout<<"infinity"<<endl;
    else cout<<"0"<<endl;
    return 0;
}
///Alhamdulillah

Problem Link: https://codeforces.com/problemset/problem/495/B

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