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