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#include<stdio.h>
#include<algorithm>
using namespace std;
struct cake
{
double amount;
double sum_price,price;
}M[1010];
bool cmp(cake a,cake b)
{
return a.price>b.price;
}
int main()
{
double need=0;
int kinds=0;
scanf("%d%lf",&kinds,&need);
for(int i=0 ; i<kinds ; ++i)
{
scanf("%lf",&M[i].amount);
}
for(int i=0 ; i<kinds ; ++i)
{
scanf("%lf",&M[i].sum_price);
M[i].price=M[i].sum_price/M[i].amount; //存储单价
}
sort(M,M+kinds,cmp); //按照单价从大到小排列
double ans=0;
for(int i=0 ; i<kinds ; ++i) //中间“need>=0”改为遍历i结束
{
if(need<=M[i].amount)
{
ans+=need*M[i].price; //这次够了,加完就结束
break;
}
else if(need>M[i].amount)
{
ans+=M[i].sum_price;
need-=M[i].amount;
}
}
printf("%.2f\n",ans);
return 0;
}
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原文地址:http://www.cnblogs.com/Evence/p/4304293.html