Cod sursa(job #1747705)
Utilizator | ricardinho ricardinho | Data | 25 august 2016 14:01:56 |
---|---|---|---|
Problema | Factorial | Scor | 25 |
Compilator | cpp | Status | done |
Runda | Arhiva de probleme | Marime | 0.56 kb |
#include <iostream>
#include <fstream>
using namespace std;
int hany5(int num)
{
int ret = 0;
while(num % 5 == 0)
{
num /= 5;
ret++;
}
return ret;
}
int solve_me(unsigned long int p)
{
int i = 1;
int total = 0;
while(total < p)
{
total += hany5(i);
i++;
}
if(total == p)
return i-1;
else
return -1;
}
int main()
{
ifstream in("fact.in");
ofstream out("fact.out");
int P; in >> P; in.close();
out << solve_me(P);
out.close();
return 0;
}