牛客网PAT练兵场-月饼

题解：用struct排序月饼的平均价格，一直取最大

题目地址：https://www.nowcoder.com/questionTerminal/6fc9a928c7654b0fbc37d16b8bd29ff9

 1 /**
 2 *
 3 *作者:Ycute
 4 *时间:2019-11-01-14.30.12
 5 *题目简单描述:struct排序
 6 */
 7 
 8 
 9 #include<iostream>
10 #include<cmath>
11 #include<cstring>
12 #include<algorithm>
13 #include<vector>
14 using namespace std;
15 struct shop{
16     int num;
17     int price;
18     double pva;
19 };
20 
21 bool cmp(struct shop a,struct shop b){
22     return a.pva>b.pva;
23 }
24 
25 int main(){
26     struct shop s[1005];
27     int t,nnum;
28     scanf("%d %d",&t,&nnum);
29     for(int i=0;i<t;i++){
30         scanf("%d",&s[i].num);
31     }
32     for(int i=0;i<t;i++){
33         scanf("%d",&s[i].price);
34         s[i].pva=s[i].price*1.0/s[i].num;
35     }
36     sort(s,s+t,cmp);
37     int i=0;
38     double sum=0;
39     while(nnum){
40         if(s[i].num<=nnum){//充足情况
41             sum+=s[i].price;
42             nnum-=s[i++].num;
43             //cout<<i<<" "<<sum<<endl;
44         }else{
45             sum+=(s[i].price*1.0/s[i].num)*nnum;
46             break;
47         }
48     }
49     printf("%.2lf
",sum);
50     return 0;
51 }