题解 | 字符串去重

import java.util.HashSet;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String str = scanner.nextLine();
        HashSet <Character> HashSet=new HashSet<>();
        for(int i=0;i<str.length();i++)
        {
            HashSet.add(str.charAt(i));
        }
        for(Character i:HashSet)
        {
            System.out.print(i);
        }
    }
}