Java,hashSet计数
字符个数统计
http://www.nowcoder.com/questionTerminal/eb94f6a5b2ba49c6ac72d40b5ce95f50
import java.util.*; public class Main{ public static void main(String [] args){ Scanner sc = new Scanner(System.in); String str = sc.nextLine(); HashSet hs = new HashSet(); for(char c : str.toCharArray()){ hs.add(c); } System.out.println(hs.size()); } }