#include?“stdio.h“
#include?“stdlib.h“

#define?MAXITEMS?100????/*?最多有MAXITEMS件物品?*/
/*?物品的結(jié)構(gòu)體?*/
struct?item
{
????int?ItemNo;????/*?物品編號(hào)?*/
????double?Weight;?/*?物品重量?*/
????double?Value;??/*?物品價(jià)值?*/
????int?Pack;??????/*?1表示轉(zhuǎn)入背包，0表示不裝入背包?*/
};

/*?快速排序：交換?*/
void?swap（struct?item?*item1?struct?item?*item2?double?*key1?double?*key2）
{
????struct?item?it;
????double?t;
????it=*item1?*item1=*item2?*item2=it;
????t=*key1?*key1=*key2?*key2=t;
}

/*?快速排序：劃分?*/
int?partition（struct?item?*items?double?*keys?int?l?int?r?char?sortType）
{
????int?i=lj=rk;
????if?（sortType==‘A‘）
????{
????????while（i????????{
????????????while（keys[i]????????????if?（i????????????while（keys[i]????????????if?（i????????}
????}?else?if?（sortType==‘D‘）?{
????????while（i????????{
????????????while（keys[i]>keys[j]）?i++;
????????????if?（i????????????while（keys[i]>keys[j]）?j--;
????????????if?（i????????}
????}
}

/*?快速排序?*/
/*?struct?item?*items：排序物品的數(shù)組?*/
/*?double?*keys：排序碼數(shù)組?*/
/*?int?l?int?r：排序的氛圍?*/
/*?char?sortType：‘A‘表示升序，‘D‘表示降序?*/
void?quickSort（struct?item?*items?double?*keys?int?l?int?r?char?sortType）
{
????int?p;????/*?分割位置?*/
????p=partition（items?keys?l?r?sortType）;
????if?（l????if?（r>p+1）??quickSort（items?keys?p+1?r?sortType）;
}

/*?鍵盤輸入數(shù)據(jù)?*/
void?inputData（int?*n?struct?item?items[]?double?*capacity）
{
???int?i;
???printf（“請(qǐng)輸入物品件數(shù)：“）;
???scanf（“%d“?n）;
???for（i=0;?i<*n;?i++）
???{
???????printf（“請(qǐng)輸入第?%d?件物品的重量和價(jià)值：“?i+1）;
???????scanf（“%lf%lf“?&items[i].Weight?&items[i].Value）;
???????items[i].ItemNo=i+1;
???????items[i].Pack=0;
???}
???printf（“請(qǐng)輸入背包容量：“）;
???scanf（“%lf“?capacity）;
}
/*?從文件讀取物品數(shù)據(jù)?*/
int?inputFile（int?*n?struct?item?items[]?double?*capacity）
{
????int?i;
????FILE?*fp;
????fp=fopen（“背包問題.in“?“r“）;
????if?（!fp）
????{
????????printf（“\n無法打開密碼文件！\n“）;
????????return?-1;
????}
????fscanf（fp?“%d“?n）;
????for（i=0;?i<*n;?i++）
????{
????????fscanf（fp?“%lf%lf“?&items[i].Weight?&items[i].Value）;
????????items[i].ItemNo=i+1;
????????items[i].Pack=0;
????}
????fscanf（fp?“%lf“?capacity）;
????fclose（fp）;
}

/*?輸出原始數(shù)據(jù)信息?*/
void?outputData（int?n?struct?item?items[]?double?capacity）
{
????int?i;
????printf（“\n共有物品?%d?件：\n“?n）;
????printf（“??編號(hào)????物品重量????物品價(jià)值\n“）;
????printf（“--------------------------------\n“）;
????for（i=0;?i????????printf（“%6d%12.2lf%12.2lf\n“?items[i].ItemNo?items[i].Weight?items[i].Value）;
????printf（“--------------------------------\n“）;
????printf（“背包容量：%.2lf\n“?capacity）;
}

/*?輸出裝入背包的結(jié)果?*/
void?outputPack（int?n?struct?item?sitems[]?double?weight

?屬性????????????大小?????日期????時(shí)間???名稱
-----------?---------??----------?-----??----

?????文件??????10505??2015-05-20?07:43??背包問題.c

?????文件?????????30??2015-04-27?16:31??背包問題.in

-----------?---------??----------?-----??----

????????????????10535????????????????????2