题解 | #删除字符串中出现次数最少的字符#

import java.util.*;


public class Main {
   public static void main(String[] args) {
      Scanner sc = new Scanner(System.in);
      Map<String,Integer> map = new HashMap();
      int count =0;
      while(sc.hasNext()){
           String str = sc.nextLine();
           String str2 = str;

           count = str.length();
           while(true){
               int length = str.length();
               String str1 = str.substring(0,1);
               str=str.replace(str1,"");
               map.put(str1,length-str.length());
               if(count>length-str.length())
                   count=length-str.length();
               if(str.length()==0)
                   break;
           }
           for(String s:map.keySet()){
               int a = map.get(s);
               if(a==count)
                   str2=str2.replace(s+"","");
           }
           System.out.println(str2);

     }
   
	}
}