题解 | #提取不重复的整数#

public static void main(String[] args) {
        java.util.Scanner sc = new java.util.Scanner(System.in);
        int num = sc.nextInt();
        StringBuffer result = new StringBuffer();
        if(num % 10 != 0){
            while(num != 0){
                int a = num % 10;
                if(!result.toString().contains(String.valueOf(a))){
                    result.append(a);
                }
                num /= 10;
            }
            System.out.println(Integer.parseInt(result.toString()));
        }
    }