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。
CF1606A.AB Balance
AB Balance
You are given a string of length consisting of characters a and/or b.
Let be the number of occurrences of string ab in as a substring. Analogically, is the number of occurrences of ba in as a substring.
In one step, you can choose any index and replace with character a or b.
What is the minimum number of steps you need to make to achieve ?
Reminder:
The number of occurrences of string in as substring is the number of indices () such that substring is equal to . For example, aabbbabaa since there are two indices : where aabbbabaa and where aabbbabaa.
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 a single string (, where is the length of the string ), consisting only of characters a and/or b.
Output
For each test case, print the resulting string with you'll get making the minimum number of steps.
If there are multiple answers, print any of them.
Note
In the first test case, both and (there are no occurrences of ab (ba) in b), so can leave untouched.
In the second test case, and , so you can leave untouched.
In the third test case, and . For example, we can change to b and make both values zero.
In the fourth test case, and . For example, we can change to a and make both values equal to .
Samples
4
b
aabbbabaa
abbb
abbaab
b
aabbbabaa
bbbb
abbaaa
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 |