Pagini recente » Cod sursa (job #248594) | Cod sursa (job #899927) | Cod sursa (job #619360) | Cod sursa (job #2497932) | Cod sursa (job #2542800)
#include <fstream>
using namespace std;
ifstream f ("dezastru.in");
ofstream g ("dezastru.out");
int n, k, i, nr, sol[30];
double rez, v[30];
void adauga ()
{
double aux = 1;
int i;
for (i=1; i<=k; i++)
aux *= v[sol[i]];
rez += aux;
}
void bkt (int poz)
{
for (int i=sol[poz-1]+1; i<=n; i++)
{
sol[poz] = i;
if (poz == k)
{
nr ++;
adauga();
}
else
bkt(poz+1);
}
}
int main()
{
f >> n >> k;
for (i=1; i<=n; i++)
f >> v[i];
bkt(1);
rez /= nr;
g << rez;
return 0;
}