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 in = new Scanner(System.in); String s = in.next(); char[] c = s.toCharArray(); HashSet<Character> hs = new HashSet<>(); for(int i =0;i<s.length();i++){ hs.add(c[i]); } System.out.print(hs.size()); } }
用hashset来进行去重操作,最后再输出hashset的大小就是答案。#牛客春招刷题训练营#https://www.nowcoder.com/discuss/730463403411525632