Cod sursa(job #2068890)
Utilizator | Data | 18 noiembrie 2017 11:33:02 | |
---|---|---|---|
Problema | Factorial | Scor | 100 |
Compilator | cpp | Status | done |
Runda | Arhiva de probleme | Marime | 0.49 kb |
#include <iostream>
#include <fstream>
using namespace std;
int const L=30;
int zero(int n)
{
int nrz=0;
while(n>=5)
nrz+=(n/=5);
return nrz;
}
int main()
{
int p,pas,r;
ifstream cin("fact.in");
ofstream cout("fact.out");
cin>>p;
pas=1<<L;
r=0;
while(pas!=0)
{
if(zero(r+pas)<p)
r+=pas;
pas=pas/2;
}
if(zero(r+1) == p)
cout << r+1;
else
cout<<-1;
return 0;
}