题解 | #字符个数统计#
字符个数统计
http://www.nowcoder.com/practice/eb94f6a5b2ba49c6ac72d40b5ce95f50
import java.util.HashSet; import java.util.Scanner;
public class Main { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); String str = scanner.next(); char[] chars = str.toCharArray(); int count = 0; HashSet set = new HashSet<>(); for (int i = 0; i < chars.length; i++) { boolean b = set.add(chars[i] + ""); if(b){ ++count; } } System.out.println(count); } }
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