欢迎来到起遇信息学
起遇信息学正处于上线筹建阶段,以下功能已全部开放免费体验: ✅ 完整题库浏览与代码提交评测(C / C++ / Python / Java 等) ✅ 入门到进阶的系列课程试读、作业与考试 ✅ AI 提示、AI 作业分析等智能助教功能 ✅ 赛事模拟与个人能力报告 ✅ 邮箱注册开放 ⏳ 付费课程订阅与微信/支付宝支付通道 ⏳ 手机号登录,微信扫码登录、微信公众号绑定 使用中如遇任何问题,欢迎通过页面底部 **"联系我们"** 与我们沟通。
CF1602A.Two Subsequences
Two Subsequences
You are given a string . You need to find two non-empty strings and such that the following conditions are satisfied:
- Strings and are both subsequences of .
- For each index , character of string must belong to exactly one of strings or .
- String is lexicographically minimum possible; string may be any possible string.
Given string , print any valid and .
Reminder:
A string () is a subsequence of a string if () can be obtained from by deletion of several (possibly, zero) elements. For example, "dores", "cf", and "for" are subsequences of "codeforces", while "decor" and "fork" are not.
A string is lexicographically smaller than a string if and only if one of the following holds:
- is a prefix of , but ;
- in the first position where and differ, the string has a letter that appears earlier in the alphabet than the corresponding letter in .
Input
Each test contains multiple test cases. The first line contains the number of test cases (). Description of the test cases follows.
The first and only line of each test case contains one string ( where means the length of ). String consists of lowercase Latin letters.
Output
For each test case, print the strings and that satisfy the given conditions. If there are multiple answers, print any.
Note
In the first test case, there are only two choices: either f and c or c and f. And c is lexicographically smaller than f.
In the second test case, a is the only character in the string.
In the third test case, it can be proven that b is the lexicographically smallest subsequence of . The second string can be of two variants; one of them is given here.
Samples
3
fc
aaaa
thebrightboiler
c f
a aaa
b therightboiler
在线编程 IDE
建议全屏模式获得最佳体验
| 进入全屏编程 | Alt+E |
| 递交评测 | Ctrl+Enter |
| 注释/取消注释 | Ctrl+/ |
| 缩放字体 | Ctrl+滚轮 |