题解 | #字符个数统计#
字符个数统计
http://www.nowcoder.com/practice/eb94f6a5b2ba49c6ac72d40b5ce95f50
public class Main{
public static void main(String[] args){
Scanner sc = new Scanner(System.in);
String str = sc.nextLine();
HashSet<Character> set = new HashSet<>();
for(int i = 0; i < str.length();i++){
set.add(str.charAt(i));
}
System.out.print(set.size());
}
}
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