A12914. Distinct Digits
编程题
普及/提高-
知识点
题目描述
You have two integers $l$ and $r$ . Find an integer $x$ which satisfies the conditions below:
- $l \le x \le r$ .
- All digits of $x$ are different.
If there are multiple answers, print any of them.
- $l \le x \le r$ .
- All digits of $x$ are different.
If there are multiple answers, print any of them.
输入格式
The first line contains two integers $l$ and $r$ ( $1 \le l \le r \le 10^{5}$ ).
输出格式
If an answer exists, print any of them. Otherwise, print $-1$ .
输入输出样例
输入 #1
121 130
输出 #1
123
输入 #2
98766 100000
输出 #2
-1
说明/提示
In the first example, $123$ is one of the possible answers. However, $121$ can't be the answer, because there are multiple $1$ s on different digits.
In the second example, there is no valid answer.
In the second example, there is no valid answer.