SMMR-T135: Stores

#include <iostream>
using namespace std;

int nb;
int first[20];
int second[20];
double mn, ss, sf, f, s;

void ChooseBook(int n){
    if(n > nb){
        mn = min(mn, (sf - (f / 100) * sf) + (ss - (s / 100) * ss));
        return;
    } else {
        ++f;
        sf += first[n];
        ChooseBook(n + 1);
        --f;
        sf -= first[n];
        ++s;
        ss += second[n];
        ChooseBook(n + 1);
        --s;
        ss -= second[n];
        return;
    }
}

int main(){

    scanf("%d", &nb);
    for(int i = 1; i <= nb; ++i){
        scanf("%d", &first[i]);
    }
    for(int i = 1; i <= nb; ++i){
        scanf("%d", &second[i]);
    }
    mn = 2e9;
    ChooseBook(1);
    printf("%.2f", mn);

    return 0;
}