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。
CF2110B.Down with Brackets
Down with Brackets
In 2077, robots decided to get rid of balanced bracket sequences once and for all!
A bracket sequence is called balanced if it can be constructed by the following formal grammar.
- The empty sequence is balanced.
- If the bracket sequence is balanced, then
(}A\mathtt{)is also balanced. - If the bracket sequences and are balanced, then the concatenated sequence is also balanced.
You are the head of the department for combating balanced bracket sequences, and your main task is to determine which brackets you can destroy and which you cannot.
You are given a balanced bracket sequence represented by a string , consisting of the characters ( and ). Since the robots' capabilities are not limitless, they can remove exactly one opening bracket and exactly one closing bracket from the string.
Your task is to determine whether the robots can delete such two brackets so that the string is no longer a balanced bracket sequence.
Input
Each test contains multiple test cases. The first line contains the number of test cases (). The description of the test cases follows.
Each test case consists of a single string () — a sequence of the characters ( and ).
It is guaranteed that is a balanced bracket sequence.
It is also guaranteed that the sum of across all test cases does not exceed .
Output
For each test case, output "YES" if the robots can make the string stop being a balanced bracket sequence, and "NO" otherwise.
You may output each letter in any case (lowercase or uppercase). For example, the strings "yEs", "yes", "Yes", and "YES" will be accepted as a positive answer.
Note
In the first test case, it can be shown that the robots will not be able to break the correct bracket sequence.
In the second test case, one of the options for removing brackets is as follows:
(())}\color{red}{\texttt{(}}\texttt{)(}\color{red}{\texttt{)}} \rightarrow \texttt{(()))(, which is not a correct bracket sequence.
In the fourth test case, one of the options for removal is as follows:
(}\color{red}{\texttt{(}}\texttt{))((}\color{red}{\texttt{)}}\texttt{)}\rightarrow \texttt{())((), which is not a correct bracket sequence.
Samples
4
(())
(())()()
()
(())(())
NO
YES
NO
YES
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 |