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Cod sursa(job #731019)
#include<fstream>
using namespace std;
int n,k1,x[30],nrc;
double p[30],probfinal;
ofstream out("dezastru.out");
inline void back(int k,double prob)
{
if(k>k1)
{
probfinal=probfinal+prob;
++nrc;
}
else
for(int i=x[k-1]+1;i<=n-k1+k;++i)
{
x[k]=i;
back(k+1,prob*p[i]);
}
}
int main()
{
ifstream in("dezastru.in");
in>>n>>k1;
for(int i=1;i<=n;++i)
in>>p[i];
back(1,1.0);
out<<probfinal/nrc;
return 0;
}