Cod sursa(job #1060636)
Utilizator | Data | 18 decembrie 2013 11:06:02 | |
---|---|---|---|
Problema | Factorial | Scor | 100 |
Compilator | cpp | Status | done |
Runda | Arhiva de probleme | Marime | 0.62 kb |
#include <iostream>
#include <fstream>
using namespace std;
ifstream f("fact.in");
ofstream g("fact.out");
long long st,dr,mij,p,sol;
long long verif(int x)
{
long long nr=0;
while(x>=5)
{
nr=nr+x/5;
x=x/5;
}
return nr;
}
int main()
{
f>>p;
if(p==0)
g<<1;
else
{
st=1;
dr=500000000;
sol=-1;
while(st<=dr)
{
mij=(st+dr)/2;
if(verif(mij)>p)dr=mij-1;
else if(verif(mij)<p)st=mij+1;
else {sol=mij;dr=mij-1;}
}
g<<sol;
}
return 0;
}