Distinct Digits
题意翻译
你有两个正整数 $ l $ 和 $ r $ ($1\leq l\leq r\leq 10^5$),请你找出一个满足下列两个条件的正整数 $x$ :
- $l\leq x\leq r.$
- $x$这个数的各个数位上的数值均不相同
假如有多个满足条件的解 $x$ ,输出任意一个均可。如果没有满足条件的解,那么输出$-1$。
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.
输入输出格式
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
输入样例 #1
121 130
输出样例 #1
123
输入样例 #2
98766 100000
输出样例 #2
-1
说明
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.