Cod sursa(job #717465)
Utilizator | FMI Trifan Mircea Mihai romircea2010 | Data | 19 martie 2012 22:21:32 |
---|---|---|---|
Problema | Dezastru | Scor | 80 |
Compilator | cpp | Status | done |
Runda | Arhiva de probleme | Marime | 0.47 kb |
#include <fstream>
using namespace std;
int n, m, nrc, m1;
double a[28], sol;
void back(int k, int s, double sum)
{
if (k == m1)
{
sol += sum;
nrc++;
}
else
for (int i=s + 1; i<=n-m+k; i++)
back(k+1, i, sum*a[i]);
}
int main()
{
ifstream f("dezastru.in");
f>>n>>m;
int i;
for (i=1; i<=n; i++)
f>>a[i];
f.close();
m1 = m + 1;
back(1, 0, 1);
ofstream g("dezastru.out");
g<<sol/nrc<<"\n";
g.close();
return 0;
}