Cod sursa(job #1474859)
Utilizator | Data | 23 august 2015 02:43:24 | |
---|---|---|---|
Problema | Factorial | Scor | 0 |
Compilator | cpp | Status | done |
Runda | Arhiva de probleme | Marime | 0.47 kb |
#include <fstream>
using namespace std;
int n,i,mij,s,j,p;
int zerouri (int x)
{
int z=0;
while(x)
z+=x/5,x/=5;
return z;
}
int main()
{
ifstream f("fact.in");
ofstream g("fact.out");
f>>p;
int st=1,dr=1000000010;
while(st<=dr)
{
mij=(st+dr)/2;
if(zerouri(mij)<p) st=mij;
else dr=mij;
}
if(zerouri(st)==p) g<<st;
else g<<-1;
f.close();
g.close();
return 0;
}