template<typename T>void swap(T* a, T* b){	T temp = *a;	*a = *b;	*b = temp;}//数组的全排列void perm(int list[], int k, int m){    if (k==m)    {        copy(list,list+m,ostream_iterator<int>(cout," "));        cout<<endl;        return;    }    for (int i=k; i<m; i++)    {    	if(list[k] == list[i] && k != i)    		continue;        swap(&list[k],&list[i]);		perm(list,k+1,m);        swap(&list[k],&list[i]);    }}

void knuth(int n, int m)

{

         srand((unsigned int)time(0));

       for (int i=0; i<n; i++)

          {

                 if (rand()%(n-i)<m)

                  {

                                cout<<i<<endl;

                                --m;

                   }

          }

}

以下prim函数的功能是分解质因数。请填空

void prim(int m, int n)

{

    if (m>n)

    {

        while (            ) n++;

                                       ;

       prim(m,n);

       cout<<n<<endl;

    }

}

分别为：m%n  和 m/=n