题解 | #数组分组#

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 in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        while (in.hasNextInt()) { // 注意 while 处理多个 case
            int len = in.nextInt();

            int sum_5 = 0;
            int sum_3 = 0;
            int sum_e = 0;
            int sum = 0;

            List<Integer> list = new LinkedList<>();
            for (int i = 0; i < len; i++) {
                int num = in.nextInt();
                if (num % 5 == 0) {
                    sum_5 += num;
                } else if (num % 3 == 0) {
                    sum_3 += num;
                } else {
                    sum_e += num;
                    list.add(num);
                }
                sum += num;
            }

            int less = sum_e - Math.abs(sum_5 - sum_3);
            if( less % 2 != 0){
                System.out.print("false");
                return;
            }

            int target = less / 2;

            System.out.print(helper(list,target,0));
        }
    }

    private static boolean helper(List<Integer> list,int target, int start){
        if(start == list.size()){
            return target == 0;
        }

        return helper(list,target - list.get(start),start + 1) || helper(list,target,start + 1);
    }
}