题解 | 灵异背包？

import java.util.ArrayList;
import java.util.List;
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 in = new Scanner(System.in);
        String n = in.nextLine();
        int math = Integer.parseInt(n);
        String number = in.nextLine();
        String[]num = number.split(" ");
        int res = 0;
        List<Integer>list = new ArrayList<>();
        int flag = 0;
        for (int i = 0; i < math; i++) {
            int a = Integer.parseInt(num[i]);
            if (a % 2 == 0) {
                res += a;
            } else {
                list.add(a);
            }
        }
        list.sort((c, b) -> b - c);
        if(list.size()%2!=0){
            list.remove(list.size()-1);
        }
        int sum=list.stream().reduce(Integer::sum).orElse(0);
        res+=sum;
        System.out.println(res);
    }
}