Cod sursa(job #2675907)
Utilizator | Bicu Codrut Eduard Edyci123 | Data | 22 noiembrie 2020 20:24:47 |
---|---|---|---|
Problema | Dezastru | Scor | 100 |
Compilator | cpp-64 | Status | done |
Runda | Arhiva de probleme | Marime | 0.54 kb |
#include <fstream>
using namespace std;
ifstream f("dezastru.in");
ofstream g("dezastru.out");
int n, p, x[30], cnt;
double v[30], prod[30], sol;
void backt(int k)
{
for(int i = x[k - 1] + 1; i <= n; i++)
{
x[k] = i, prod[k] = prod[k - 1] * v[i];
if(k >= p)
sol += prod[k] , cnt++;
else
backt(k + 1);
}
}
int main()
{
f >> n >> p;
for(int i = 1; i <= n; i++)
f >> v[i];
prod[0] = 1;
backt(1);
g << sol / cnt;
return 0;
}