Cod sursa(job #2541040)
Utilizator | Borgovan Alexandru BAlexandru | Data | 7 februarie 2020 23:44:48 |
---|---|---|---|
Problema | Dezastru | Scor | 70 |
Compilator | cpp-64 | Status | done |
Runda | Arhiva de probleme | Marime | 0.6 kb |
#include <fstream>
using namespace std;
ifstream f("dezastru.in");
ofstream g("dezastru.out");
int n, k;
int x[26];
int nr;
double p[26], rez;
void bkt(int niv, double prod)
{
for (int i=x[niv-1]+1; i<=n; i++)
{
x[niv] = i;
prod *= p[i];
if (niv == k)
{
rez += prod;
nr++;
}
else
bkt(niv+1, prod);
prod /= p[i];
}
}
int main()
{
f >> n >> k;
for (int i=1; i<=n; i++)
f >> p[i];
bkt(1, 1);
rez /= nr;
g << rez;
return 0;
}