直接累加不就可以了~~
#include<iostream.h>
int main()
{
  long n,i,j,k,l,p,q;
  cin>>n; cin>>k;
  j = 0;
  for (i = 1; i <= n; i++)
  {
    cin>>l;
    p = 1;
    for (q = 1; q <= k; q++) p = p * l;
    if (p > 0) j = j + p;
  }
  cout<<j<<endl;
  return 0;
}