题解 | #删除字符串中出现次数最少的字符#

import java.util.Scanner;
import java.util.*;

// 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 scanner = new Scanner(System.in);
        while(scanner.hasNextLine()){
            Map<Character, Integer> map = new HashMap<>();
            String input = scanner.nextLine();
            if(input == null || "".equals(input)){
                break;
            }
            char[] array = input.toCharArray();
            for(Character temp : array){
                if(map.get(temp) == null || map.get(temp) == 0){
                    map.put(temp, 1);
                    continue;
                }
                map.put(temp, map.get(temp)+1);
            }
            if(map.isEmpty()){
                return;
            }
            int less = map.entrySet().stream().sorted(Comparator.comparing(e->e.getValue().intValue())).findFirst().get().getValue();
            for(Character character : map.keySet()){
                if(map.get(character) == less){
                    input = input.replaceAll(character.toString(), "");
                }
            }
            System.out.println(input);
        }
    }
}