Cod sursa(job #2743774)
Utilizator | Mihai Crisan mihaicrisan | Data | 23 aprilie 2021 14:58:54 |
---|---|---|---|
Problema | Factorial | Scor | 100 |
Compilator | cpp-64 | Status | done |
Runda | Arhiva de probleme | Marime | 0.59 kb |
#include <fstream>
using namespace std;
ifstream fin ("fact.in");
ofstream fout("fact.out");
int nrZero (int x){
int s = 0;
while (x > 0){
s += x / 5;
x /= 5;
}
return s;
}
int main()
{
int p, st, dr, sol;
fin >> p;
st = 1, dr = 1000000000;
while (st <= dr){
int mid = (st + dr) / 2;
if (nrZero(mid) >= p){
sol = mid;
dr = mid - 1;
}
else
st= mid + 1;
}
if (nrZero(sol) == p)
fout << sol;
else
fout << -1;
return 0;
}