Cod sursa(job #2549896)
Utilizator | Bolota Iustin iustin2004 | Data | 18 februarie 2020 08:57:55 |
---|---|---|---|
Problema | Factorial | Scor | 100 |
Compilator | cpp-64 | Status | done |
Runda | Arhiva de probleme | Marime | 0.68 kb |
#include <bits/stdc++.h>
using namespace std;
ifstream fin("fact.in");
ofstream fout("fact.out");
int putere(int x)
{
int z=0,y;
y=5;
while(x>=y)
{
z=z+x/y;
y=y*5;
}
return z;
}
int p,i,st,dr,mij,nrz;
int main()
{
fin>>p;
if(p==0)
{
fout<<1;
return 0;
}
st=5;
dr=2000000000;
while(st<=dr)
{
mij=(st+dr)/2;
nrz=putere(mij);
if(nrz==p)
{
fout<<mij-mij%5;
return 0;
}
else
if(nrz<p)
st=mij+1;
else
dr=mij-1;
}
fout<<-1;
return 0;
}