Cod sursa(job #1424848)

Utilizator andrei124Andrei Roman andrei124 Data 25 aprilie 2015 16:11:32
Problema Factorial Scor 90
Compilator cpp Status done
Runda Arhiva de probleme Marime 0.35 kb
#include<fstream>
using namespace std;
ifstream in("fact.in");
ofstream out("fact.out");

int zero(int n)
{
int nr=0;
while(n>=5){
nr+=n/5;
n/=5;}
return nr;
}

int cb(int p)
{
int i=0,pas=1<<30;
while(pas!=0)
{
if(zero(i+pas)<p)i+=pas;
pas/=2;
}
return 1+i;
}

int main()
{
  int n,i,p,a;
  in>>p;

 if(cb(p)==0)out<<-1;

  else out<<cb(p);


  return 0;
}