AC CODE:
#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <algorithm>
#include <iomanip>
#include <cmath>
#include <cstring>
using namespace std;
struct mooncake{
double store;
double total;
double price;
};
bool cmp(struct mooncake a,struct mooncake b){
return a.price > b.price ;
}
int main()
{
int n,D;
cin>>n>>D;
double ans = 0;
struct mooncake *mooncake;
mooncake = (struct mooncake *)malloc(sizeof(struct mooncake)*n);
for(int i = 0; i < n ; i ++){
cin>>mooncake[i].store;
}
for(int i = 0 ;i < n ; i ++){
cin>>mooncake[i].total;
mooncake[i].price = (mooncake[i].total / mooncake[i].store) ;
}
sort(mooncake,mooncake+n,cmp);
for( int i = 0 ; i < n ; i ++){
if( mooncake[i].store > D){
ans += D * mooncake[i].price ;
break;
}
else{
ans += mooncake[i].total;
D -= mooncake[i].store ;
}
}
cout<<setiosflags(ios::fixed)<<setprecision(2)<<ans<<endl;
// for(int i = 0;i < n ; i ++){
// cout<<setiosflags(ios::fixed)<<setprecision(2)<<mooncake[i].price<<endl;
//}
return 0;
}