题解 | #字符个数统计#
字符个数统计
https://www.nowcoder.com/practice/eb94f6a5b2ba49c6ac72d40b5ce95f50
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 str = in.nextLine();
HashSet<Character>set = new HashSet<>();
int index = str.indexOf("\n");
if (index > 0) {
str = str.substring(0, index);
}
int size = str.length();
int i = 0;
while (i < size) {
set.add(str.charAt(i));
i++;
}
System.out.println(set.size());
}
}


查看10道真题和解析