0-1 背包问题

class Object {
    friend int Knapsack(int*, int*, int, int, int*);
public:
    int operator<=(Object a) const { return d >= a.d; }
private:
    int ID;
    float d;
};

template <class Typew, class Typep> class Knap;
class bbnode {
    friend Knap<int, int>;
    friend int Knapsack(int*, int*, int, int, int*);
private:
    bbnode *parent;
    bool LChild;
};

template <class Typew, class Typep>
class HeapNode {
    friend Knap<Typew, Typep>;
public:
    operator Typep() const { return uprofit; }
private:
    Typep uprofit, profit;
    Typew weight;
    int level;
    bbnode *ptr;
};

template