题解 | 最小循环节 - set 计数
最小循环节
https://www.nowcoder.com/practice/761f78551b854037abe412c2de615c05
import java.util.HashSet;
import java.util.Scanner;
import java.util.Set;
public class Main {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
String s = in.nextLine().trim();
Set<Character> set = new HashSet<>();
for(char ch : s.toCharArray()) set.add(ch);
System.out.println(set.size());
}
}
#笔试好难##笔试#
