贪心法求解01背包问题

{
fscanf(fp,"%s %d %d\n",&Array[i].name,&Array[i].price,&Array[i].weight);
}
}
fclose(fp);
Array=Input(Array,TotalNum,TotalWeight);
break;
case 2:
printf("请输入物品数量及背包容量\n");
wp[j+1]=temp;
}
}
break;
case 3:
for(i=0;i<TotalNum;i++)
for(j=0;j<TotalNum-i-1;j++)
{
if((float)wp[j].price/(float)wp[j].weight<(float)wp[j+1].price/(float)wp[j+1].weight)
printf("1.空间最优\n");
printf("2.价格最优\n");
printf("3.价格空间比最优\n");
scanf("%d",&Way);
switch(Way)
{
case 1:
for(i=0;i<TotalNum;i++)
for(j=0;j<TotalNum-i-1;j++)
{
if(wp[j].weight>wp[j+1].weight)
{
temp=wp[j];
wp[j]=wp[j+1];
wp[j+1]=temp;r(i=0;i<TotalNum;i++)
for(j=0;j<TotalNum-i-1;j++)
{
if(wp[j].price<wp[j+1].price)
{
temp=wp[j];
wp[j]=wp[j+1];
{
temp=wp[j];
wp[j]=wp[j+1];
wp[j+1]=temp;
}
}
break;
default:
{
printf("输入错误!\n");
exit(1);
}
}
i=0;
RealWeight=wp[0].weight;
TotalPrice=wp[0].price;
printf("被装入背包的物品是:\n(物品名价格重量)\n");
exit(1);
}
}
printf("继续其他数据测试请按1\n");
scanf("%d",&Goon);
}while(Goon==1);
delete Array;
printf("1.文件读入\n");
printf("2.键盘输入\n");
scanf("%d",&InputWay);
switch(InputWay)
{
case 1:
printf("请输入背包最大容量:");
scanf("%d",&TotalWeight);
fp=fopen("data.txt","r");
scanf("%d%d",&TotalNum,&TotalWeight);
if((Array=(Project*)malloc(TotalNum*sizeof(Project)))==NULL)
{
printf("内存已满,申请空间失败!\n");
}exit(1);
}
else
{
printf("请输入:物品名价格重量\n");
贪心法的关键是度量标准，这个程序的度量标准有三个
占用空间最小
物品效益最大
物品效益/占用空间最大
程序实现如下：
至于文件的操作不加论述。
#include <stdio.h>
#include <stdlib.h>
typedef struct
{
char name[10];
int weight;
int price;
}Project;
Project *Input(Project *wp,int TotalNum,int TotalWeight)
{
int i,j,Way,GoBack,RealWeight,RealPrice,TotalPrice;
Project temp;
do{
printf("请选择:\n");
fscanf(fp,"%d\n",&TotalNum);
if((Array=(Project*)malloc(TotalNum*sizeof(Project)))==NULL)
{
printf("内存已满,申请空间失败!\n");
exit(1);
}
else
{
for(i=0;i<TotalNum;i++)
for(i=0;i<TotalNum;i++)
scanf("%s%d%d",&Array[i].name,&Array[i].price,&Array[i].weight);}
Array=Input(Array,TotalNum,TotalWeight);
break;
default:
{
printf("输入错误!\n");
while(RealWeight<TotalWeight&&i<TotalNum)
{
printf("%s%d%d\n",wp[i].name,wp[i].price,wp[i].weight);
i++;
RealWeight+=wp[i].weight;
TotalPrice+=wp[i].price;
}
RealWeight-=wp[i].weight;
TotalPrice-=wp[i].price;
printf("求解结束!背包所装物品总重量:%d,总价值:%d\n",RealWeight,TotalPrice);printf("退出本次测试请按0!\n");
scanf("%d",&GoBack);
}while(GoBack!=0);
return wp;
}
void main()
{
int InputWay,TotalNum,i,TotalWeight,RealWeight,Goon,TotalPrice;
Project *Array;
FILE *fp;
do{
printf("请选择数据录入方式!\n");