AC了 package xiaomi; import java.util.*; public class Main {     public static void main(String[] args) {         Scanner sc = new Scanner(System.in);                  List<Long> list_all_nums = new ArrayList<Long>();         List<String> inputs = new ArrayList<String>();         do{             String input = sc.nextLine();             inputs.add(input);             if("END".equals(input)){                 break;             }             String[] strs = input.split("#");             long k = Long.parseLong(strs[1], Integer.parseInt(strs[0]));             list_all_nums.add(k);         }while(true);         int count = 0;         for (int i = 0; i < list_all_nums.size(); i++) {             List tmp = new ArrayList<>(list_all_nums);             tmp.remove(i);             Set set = new HashSet<>(tmp);             int size = set.size();             set.add(list_all_nums.get(i));             if(set.size() != size){                 System.out.println(inputs.get(i));                 count++;             }         }         if(count==0){             System.out.println("None");         }              }      }