题解 | #字符个数统计#
字符个数统计
http://www.nowcoder.com/practice/eb94f6a5b2ba49c6ac72d40b5ce95f50
Set()
import java.util.*;
public class Main{
public static void main(String[] args){
Scanner sc = new Scanner(System.in);
String s = sc.nextLine();
HashSet<Character> set = new HashSet<>();
for(char c : s.toCharArray()){
if(!set.contains(c)){
set.add(c);
}
}
System.out.println(set.size());
}
}
