题解 | #字符个数统计#

import java.util.*;

public class Main{ public static void main(String[] args){ Scanner sc = new Scanner(System.in); while(sc.hasNextLine()){ String str = sc.nextLine(); HashSet hs = new HashSet(); for(int i = 0; i < str.length(); i++){ hs.add(str.charAt(i)); } System.out.println(hs.size()); } } }