题解 | #字符个数统计#
字符个数统计
http://www.nowcoder.com/practice/eb94f6a5b2ba49c6ac72d40b5ce95f50
1. 思路就是去重+计算字符串长度
2. set的不重复性质去重也可以
import java.util.*;
public class Main{
public static void main(String[] args){
Scanner sc = new Scanner(System.in);
String str = sc.nextLine();
StringBuffer ans = new StringBuffer();
for(int i = 0; i<str.length(); i++){
if(!ans.toString().contains(str.substring(i,i+1))){
ans.append(str.substring(i,i+1));
}
}
System.out.println(ans.toString().length());
}
}
