Cod sursa(job #2075693)
Utilizator | Data | 25 noiembrie 2017 16:51:02 | |
---|---|---|---|
Problema | Factorial | Scor | 100 |
Compilator | cpp | Status | done |
Runda | Arhiva de probleme | Marime | 0.5 kb |
#include <fstream>
using namespace std;
ifstream cin ("fact.in") ;
ofstream cout ("fact.out") ;
int zero (int n)
{
int nr = 0 ;
while(n >= 5) {
nr = nr + (n = n/5) ;
}
return nr;
}
int main()
{
int n , pas ;
cin >> n ;
pas = 1 << 29;
int r = 0 ;
while(pas != 0)
{
if(zero( r + pas ) < n) {
r = r + pas ;
}
pas >>=1 ;
}
if(zero(r + 1) == n)
cout << r + 1 ;
else
cout << -1 ;
return 0 ;
}