Cod sursa(job #3167133)
Utilizator | Mogonea Mihnea Mihai MogoneaMIhnea | Data | 10 noiembrie 2023 09:19:25 |
---|---|---|---|
Problema | Factorial | Scor | 90 |
Compilator | cpp-64 | Status | done |
Runda | Arhiva de probleme | Marime | 0.71 kb |
#include<fstream>
using namespace std;
ifstream fin ("fact.in");
ofstream fout ("fact.out");
int p, aux, nr, mid, st ,dr, m, aux1;
int main(){
fin>>p;
if(p!=0){
st=1;
dr=p;
while(st<=dr){
mid=(st+dr)/2;
aux=mid/5;
nr=0;
while(aux>0){
nr+=aux;
aux/=5;
}
aux1=mid+nr;
if(aux1==p){
m=mid;
break;
}
if(aux1>p)
dr=mid-1;
else
st=mid+1;
}
if(m*5>0)
fout<<m*5;
else
fout<<'-1';
}else
fout<<1;
}