Cod sursa(job #2949465)
Utilizator | Data | 30 noiembrie 2022 18:23:51 | |
---|---|---|---|
Problema | Factorial | Scor | 60 |
Compilator | cpp-64 | Status | done |
Runda | Arhiva de probleme | Marime | 0.62 kb |
#include <fstream>
#define drMAX 100000005
using namespace std;
int nrZero(int n){
int s=0;
while(n>=5){
n/=5;
s+=n;
}
return s;
}
int binS(int p)
{
int st=1, dr=drMAX, poz=-1;
while(st<=dr){
int mij=st+(dr-st)/2;
if(p==nrZero(mij)){
poz=mij;
}
if(p<=nrZero(mij)){
dr=mij-1;
}
else{
st=mij+1;
}
}
return poz;
}
int main()
{
ifstream cin("fact.in");
ofstream cout("fact.out");
int P;
cin>>P;
cout<<binS(P);
return 0;
}