Cod sursa(job #831291)
Utilizator | Cobuz Ionut-Alexandru CobuzIonut | Data | 8 decembrie 2012 13:41:46 |
---|---|---|---|
Problema | Factorial | Scor | 0 |
Compilator | cpp | Status | done |
Runda | Arhiva de probleme | Marime | 0.48 kb |
#include <iostream>
#include<fstream>
#include<climits>
using namespace std;
ifstream fin("fact.in");
ofstream fout("fact.out");
int main()
{
int p,m,i=1,k,j=LONG_MAX,ok=0,x;
fin>>p;
if(p==0)fout<<"1";
while(i<=j&&ok==0){
m=(i+j)/2;
x=5;
k=0;
while(x<=m){
k=k+m/x;
x=x*5;}
if(k==p)ok=1;
else if(k>p)j=m-1;
else i=m+1;
}
if(ok==0)fout<<"-1";
else {
while(m%5!=0)m--;
fout<<m;
}
}s