495B - Modular Equations - CodeForces Solution


math number theory *1600

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C++ Code:

#include<iostream>
#include<bits/stdc++.h>
using namespace std;
#define fr(i,a,b)  for(ll i=a;i<b;i++)
#define ll long long
#define cline cout<<endl

int main()
{
int a,b;
cin>>a>>b;

if(a==b){
    cout<<"infinity";
}
else if(a<b){
    cout<<0;
}
else{
   int x=0;

   for(int i=1;i*i<=(a-b);i++){

    if((a-b)%i==0){
                
                int y=(a-b)/i;
                if(i>b){
                    x++;
                }
                if(y>b && y!=i){
                    x++;
                }
   }

}
cout<<x;

}
 return 0;
}


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