pat 1070Mooncake (25)

#include<iostream>
#include<algorithm>
#include<iomanip>
using namespace std;


struct moon
{
double amounts;
double price;
double value;
}mooncake[1005];


bool cmp(const struct moon &a,const struct moon &b)//注意这里的写法
{

return a.value>b.value;
}






int main()
{
int n,demands;
int i,k;
double profit;
cin>>n>>demands;
for(i=1;i<=n;i++)
{
cin>>mooncake[i].amounts;
}
for(i=1;i<=n;i++)
{
cin>>mooncake[i].price;
mooncake[i].value=mooncake[i].price/mooncake[i].amounts;
}


sort(mooncake+1,mooncake+n+1,cmp);


profit=0.0;
for(i=1;i<=n;i++)
{
if(demands<=0)break;
if(demands>mooncake[i].amounts)
{
profit+=mooncake[i].price;
demands-=mooncake[i].amounts;
}
else
{
profit+=demands*mooncake[i].value;
demands-=demands;
}
}
cout<<fixed<<setprecision(2)<<profit<<endl;
system("pause");
return 0;
}