题解 | #称砝码#

import java.util.*;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int[] m = new int[n];
        int[] x = new int[n];
        ArrayList<Integer> arrayList = new ArrayList<>();
        HashSet<Integer> hashSet = new HashSet<>();
        for (int i = 0; i < n; i++) {
            m[i] = sc.nextInt();
        }
        for (int i = 0; i < n; i++) {
            x[i] = sc.nextInt();
        }
        for (int i = 0; i < n; i++) {
            for (int j = 0; j < x[i]; j++) {
                arrayList.add(m[i]);
            }
        }
        hashSet.add(0);
        for (Integer integer : arrayList) {
            HashSet<Integer> copy = new HashSet<>(hashSet);
            for (Integer num : hashSet) {
                copy.add(integer + num);
            }
            hashSet = copy;
        }
        System.out.println(hashSet.size());
    }
}