Cod sursa(job #786533)
Utilizator | Popa Andrei andreiiii | Data | 11 septembrie 2012 16:11:14 |
---|---|---|---|
Problema | Factorial | Scor | 50 |
Compilator | cpp | Status | done |
Runda | Arhiva de probleme | Marime | 0.73 kb |
#include <fstream>
using namespace std;
ifstream fin("fact.in");
ofstream fout("fact.out");
int div5(int n)
{
int i=0;
while(n%5==0)
{
i++;
n/=5;
}
return i;
}
int main()
{
int n, i, s=0, p=0, j;
fin>>n;
if(!n) fout<<1;
else
{
for(i=5;;i+=5)
{
j=0;
p=i;
while(p%5==0)
{
j++;
p/=5;
}
s+=j;
if(s==n)
{
fout<<i;
break;
}
else
if(s>n)
{
fout<<-1;
break;
}
}
}
}