Cod sursa(job #370295)
Utilizator | Data | 30 noiembrie 2009 19:00:02 | |
---|---|---|---|
Problema | Dezastru | Scor | 0 |
Compilator | cpp | Status | done |
Runda | Arhiva de probleme | Marime | 0.39 kb |
#include<fstream.h>
int j,n,k,t,u,x[40],i;
long double p,s,a[40],b[40][40];
int main()
{
ifstream f("dezastru.in");
ofstream g("dezastru.out");
f>>n>>t;
for(i=1;i<=n;i++){f>>a[i];b[i][0]=a[i];}
for(i=1;i<=n;i++)
for(j=1;j<=i;j++)
b[i][j]=b[i-1][j]+a[i]*b[i-1][j-1];
s=b[n][k];
for(i=t+1;i<=n;i++)s/=i;
for(i=1;i<=n-t;i++)s*=i;
g<<s;
g.close();
return 0;
}