public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String input = sc.nextLine();
        String list1 = input.substring(0, input.indexOf("|"));
        String list2 = input.substring(input.indexOf("|") + 1);
        String[] link1 = list1.split(",");
        String[] link2 = list2.split(",");
        //作为结果
        List<Integer> list = new LinkedList<>();
        int i = 0;
        int j = 0;
        while (i < link1.length && j < link2.length) {
            int num1 = Integer.parseInt(link1[i]);
            int num2 = Integer.parseInt(link2[j]);
            if (num1 <= num2) {
                if (!list.contains(num1)) {
                    list.add(num1);
                }
                i++;
            } else {
                if (!list.contains(num2)) {
                    list.add(num2);
                }
                j++;
            }
        }
        while (i < link1.length) {
            int num1 = Integer.parseInt(link1[i]);
            if (!list.contains(num1)) {
                list.add(num1);
            }
            i++;
        }
        while (j < link2.length) {
            int num2 = Integer.parseInt(link2[j]);
            if (!list.contains(num2)) {
                list.add(num2);
            }
            j++;
        }
        System.out.println(list.toString());
    }

第一题代码大概长这样，然而有个下标递增写错了，只通过了66.7%