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 int[] a = new int[128];
    public static void main(String[] args){
        Scanner in = new Scanner(System.in);
        String str = in.nextLine();
        char[] arr = str.toCharArray();
        int min = 20;
        int len = arr.length;
        for(int i=0; i < len; i++){
            a[arr[i]]++;
        }
        for(int i=0; i < len; i++){
            if(a[arr[i]] < min){
                min = a[arr[i]];
            }
        }
        
        for(int i=0; i < len; i++){
            if(a[arr[i]] != min){
                System.out.print(arr[i]);
            }
        }
   
    }
}