题解 | #牛牛吃草#

import java.util.Scanner;

// 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 scanner = new Scanner(System.in);
        int num = scanner.nextInt();
        int[] w = new int[num + 1];
        int[] a = new int[num + 1];
        int[] f = new int[num + 1];
        for (int i = 1; i <= num; i++) {
            w[i] = scanner.nextInt();
            f[i] = w[i];
        }
        for (int i = 1; i <= num; i++) {
            a[i] = scanner.nextInt();
        }
        for (int i = 1; i <= num; i++) {
            for (int j = 1; j < i; j++) {
                if ((j - i) % a[j] == 0) f[i] = Math.max(f[i], w[i] + f[j]);
            }
        }
        int max = 0;
        for (int i : f) max = Math.max(max, i);
        System.out.println(max);
    }
}