请把以下代码改写为c++语言：#include iostream#include string#includealgorithmusing namespace std;double s;int a50nk;int main cinn; forint i=1;i=n;i++ cinai; cink; sorta+1a+1+ngreaterint;

#include #include #include using namespace std; double s; int a[50],n,k; int main() { cin>>n; for(int i=1;i<=n;i++){ cin>>a[i]; } cin>>k; sort(a+1,a+1+n,greater()); for(int i=1;i<=k;i++){ s+=a[i]; } cout.precision(2); cout<<fixed<<s/k+0.005; return 0; }