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。
CF2169B.Drifting Away
Drifting Away
There's a river flowing in front of Monocarp's house, which can be represented as a strip of cells. In some cells, there is a strong current, while in others, there is no current. It can be represented as a string , consisting of the following characters:
- the "less-than" sign ('
<') — leftward current; - the "greater-than" sign ('
>') — rightward current; - an asterisk ('
\*') — no current.
At first, Monocarp chooses the cell to start his journey along the river at.
If there is a current in the cell, where Monocarp is at the moment, he is carried to the neighboring cell in the direction of the current. If there is no neighboring cell (i. e., a leftward current in cell or a rightward current in cell ), Monocarp ends up on the shore. Each move takes one minute.
If there is no current in the cell, where Monocarp is at the moment, he rows to the neighboring cell on the left or to the neighboring cell on the right. If there is no neighboring cell in the direction where Monocarp decides to row to, he ends up on the shore. Each move also takes one minute.
Monocarp wants to sail along the river for as long as possible. If Monocarp can sail infinitely, print . Otherwise, print the maximum time Monocarp can sail along the river before ending up on the shore.
Input
The first line contains a single integer () — the number of test cases.
The only line of each test case contains a string (), consisting only of characters '<' (leftward current), '>' (rightward current), '\*' (no current). The ASCII codes are , , and , respectively.
An additional constraint on the input: the total length of strings over all test cases does not exceed .
Output
For each test case, output a single integer:
- , if Monocarp can sail along the river infinitely;
- the maximum time Monocarp can sail along the river before ending up on the shore, otherwise.
Samples
4
*****
<<<>
>*<
*
-1
3
-1
1
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 |