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 num = in.nextInt();
            int sum5 = 0;
            int sum3 = 0;
            LinkedList<Integer> ld = new LinkedList<Integer>();

            int sum = 0;
            for (int i = 0; i < num; i++) {
                int temp = in.nextInt();
                if (temp % 5 == 0) {
                    sum5 += temp;
                    sum += temp;
                } else if ( temp % 3 == 0) {
                    sum3 += temp;
                    sum += temp;
                } else {
                    sum += temp;
                    ld.add(temp);
                }
            }
            if (sum % 2 != 0) {
                System.out.println("false");
            } else {
                sum = sum / 2 - sum5;
                
                System.out.println(isFind(ld, 0, sum));
            }

        }

    }
    public static boolean isFind(LinkedList<Integer> ld, int start, int sum) {
        if (sum == 0) {
            return true;
        } else {
            if (start < ld.size() ) {
                return isFind(ld, start + 1, sum - ld.get(start)) || isFind(ld, start + 1, sum);
            } else {
                return false;
            }

        }

    }
}