裝箱問題的簡單實現

//裝箱問題的簡單實現

#include <iostream>
#include <stdlib.h>
#include <time.h>
using namespace std;

typedef struct{
	int gno;
	int gv;
}Goods;

class GNode{
	private:
		int gno;
		GNode * link = NULL;
	public:
		GNode(int gno){
			this->gno = gno;
		}
		~GNode(void){}
		int &Getgno(){return gno;}
		GNode* &Getlink(){return link;}
};

class GBox{
	private:
		int gv = 10;
		GNode *gh = NULL;
		GBox *next = NULL;
	public:
		GBox(void){}
		~GBox(void){}
		int &Getgv(){return gv;}
		GNode* &Getgh(){return gh;}
		GBox* &Getnext(){return next;}
};

class Realize{
	private:
		GBox *ghead = NULL;
		Goods *goods = NULL;
		int n;
	public:
		Realize(int value):n(value){}
		~Realize(){}
		void goodsinit(void);
		void PackingBox(); 
		void PrintTable();
		void PrintResult();
		void dofun(void);
};
void Realize::goodsinit(void){
	srand((unsigned)time(NULL));
	goods = new Goods[n]();
	for(int i=0;i<n;i++){
		goods[i].gno = i+1;
		goods[i].gv = rand()%10+1;
	}
	for(int i=0;i<n-1;i++)
		for(int j=i+1;j<n;j++){
			Goods t;
			if(goods[i].gv < goods[j].gv){
				t = goods[i];
				goods[i] = goods[j];
				goods[j] = t;
			}
		}
} 
void Realize::PrintTable(){
	for(int i=0;i<n;i++){
		cout<<"NO."<<goods[i].gno<<":"<<goods[i].gv<<endl;
	}
}
void Realize::PackingBox(){
	GNode *j;
	GBox *p,*t = NULL;
	for(int i=0;i<n;i++){
		j = new GNode(goods[i].gno);
		p = ghead;
		//找到第一個可以放的箱子或者是新開一個箱子 
		while(p && p->Getgv() < goods[i].gv){
			p = p->Getnext();
		} 	
		if(!p){//p爲空,開新箱子 
			 if(!t){//頭結點
			    p = ghead = t = new GBox();
			 }
			 else{
			 	p = t = t->Getnext() = new GBox();
			 }
		}	
		//p可以被放在當前位置
		if(!p->Getgh()){//箱子裏無物品 	
			p->Getgh() = j;			
		}
		else{	
			GNode *k = p->Getgh();
			while(k->Getlink())
				k = k->Getlink();
			k->Getlink() = j;	
		}
		p->Getgv() -= goods[i].gv;	
	}
}
void Realize::PrintResult(void){
	GBox *p;
	GNode *q;
	int i = 1;
	for(p = ghead;p;p = p->Getnext()){
		cout<<"第"<<i++<<"個箱子："<<endl;
		for(q = p->Getgh();q;q = q->Getlink()){
			cout<<"NO."<<q->Getgno()<<"    ";
		}
		cout<<"剩餘空間："<<p->Getgv()<<endl;
	}
}
void Realize::dofun(void){
	goodsinit();
	PrintTable();
	cout<<"物品清單排序完畢！"<<endl;
	PackingBox();
	cout<<"裝箱完畢！"<<endl;
	PrintResult();
	cout<<"輸出結果完畢！"<<endl; 
}

int main(void)
{
	Realize* r = new Realize(20);
	r->dofun();
	return 0;
}