Cod sursa(job #1908436)
Utilizator | Data | 7 martie 2017 07:52:00 | |
---|---|---|---|
Problema | Dezastru | Scor | 10 |
Compilator | cpp | Status | done |
Runda | Arhiva de probleme | Marime | 0.55 kb |
#include <iostream>
#include <fstream>
using namespace std;
ifstream f("dezastru.in");
ofstream g("dezastru.out");
int n,k,q;
float x[26],w;
int v[26];
void sum()
{
float s=1;
for(int i=1;i<=k;i++)
s*=x[v[i]];
w+=s;
}
void p(int i)
{
v[i]=i;
for(int j=1;j<=i;j++)
{
swap(v[j],v[i]);
if(i==n){ q++;sum();}
else p(i+1);
swap(v[j],v[i]);
}
}
int main()
{
f>>n>>k;
int i;
for(i=1;i<=n;i++)
f>>x[i];
p(1);
g<<w/q;
return 0;
}