valentinesday.cpp

// NOTE: it is recommended to use this even if you don't understand the following code.

#include <fstream>
#include <iostream>
#include <string>
#include <vector>
#include <algorithm>

using namespace std;

struct pacco {
    int quantita;
    int prezzo;

    bool operator< (pacco & right) {
        pacco left = *this;
        return left.prezzo < right.prezzo || (left.prezzo == right.prezzo && left.quantita < right.quantita);
    }
};

int main() {
    // uncomment the two following lines if you want to read/write from files
    // ifstream cin("input.txt");
    // ofstream cout("output.txt");

    int N, M;
    cin >> N >> M;

    vector<pacco> c(N);
    for (int i = 0; i < N; ++i)
        cin >> c[i].quantita;

    for (int i = 0; i < N; ++i)
        cin >> c[i].prezzo;

    int maxChocolates = 0;


    // INSERT YOUR CODE HERE
    sort (c.begin(), c.end());

    for (int i=0; i<N; i++) {
        if (c[i].prezzo <= M) {if (c[i].quantita % 2 == 0) maxChocolates = max(c[i].quantita, maxChocolates);}
        else break;
    }

    cout << maxChocolates << endl;

    return 0;
}