非递归求集合的幂集

#include <iostream>

using namespace std;

void Output(unsigned a[],unsigned k,unsigned m,unsigned n)  //k表示此次输出的个数，m表示从第几个开始输出
{

    for(unsigned j=k+m;j<n;j++)
    {  cout<<"<";
       unsigned t=a[j];a[j]=a[k+m];a[k+m]=t;
        for(unsigned i=m;i<=k+m;i++)
            cout<<a[i];
         t=a[j];a[j]=a[k+m];a[k+m]=t;
         cout<<">";
    }
}
void Powerset(unsigned a[],unsigned n)
{
    cout<<"<>";
    for(unsigned i=0;i<n;i++)
        cout<<"<"<<a[i]<<">";
    for(unsigned i=1;i<n;i++)
    {
        for(unsigned j=0;j<=n;j++)
        {
           Output(a,i,j,n);
        }
    }
}
int main()
{
    unsigned a[]={1,2,3,4,5,6};
    Powerset(a,5);
}