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在 OJ 工具页面中添加 Codeforces Contest Helper v2

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### 页面英文名 Codeforces Contest Helper v2 ### 我希望能添加的内容是 OJ 工具这个[页面](https://oi-wiki.org/tools/oj-tool/)，建议添加一个 CCHv2（Codeforces Contest Helper v2），个人认为这个软件对于使用 CF 还是很有帮助的，主要的内容感觉可以直接把 tiger2005 写的博客搬运过来（不过肯定要简化一些，原文很长）。 ### 我了解到的相关参考资料有 tiger2005 的博客：[https://www.luogu.com.cn/blog/tiger2005/codeforces-contest-helper-v2-qing-song-xie-jue-cf-bi-sai-xu-qiu](https://www.luogu.com.cn/blog/tiger2005/codeforces-contest-helper-v2-qing-song-xie-jue-cf-bi-sai-xu-qiu)

### Describe the error I have two VGroup objects, which consisting of other VGroups and Mobjects, when I trying to apply a ReplacementTransformation to these two VGroup objects, some errors...

After adding -g3 compiler option in Makefile, a test in usertests.c doesn't pass

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This problem was discovered when I used gdb to debug code in one of the labs (to be specific, mmap). Because I want to check the macros, I added the...

In the original `sample.md` file, a with class sets to mermaid is used to enclose the mermaid code. However, this does not properly display the mermaid diagram. After changing it...

(USED TO FIX MAINTAINER ACCESS ISSUE) Overloaded operators for MArrayPointer and MVariable, separted classes to different files

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same as #20, used my personal account for this PR instead of a group.

- Implemented `Rc` and `Arc` - Changed file organization to include an external library and example folder for `Rc` and `Arc`. - Might need to provide more robust tests for...

From the example provided, I know that you can include other libraries in the C++ blocks: ```rs cpp!{{ #include }} ``` I'm wondering if it is possible to use things...

Deployment failed with `send-pack: unexpected disconnect while reading sideband packet`

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### Check List - [X] I have already read [Docs page](https://hexo.io/docs/) & [Troubleshooting page](https://hexo.io/docs/troubleshooting). - [X] I have already searched existing issues and they are not help to me. -...

Update troubleshooting.md

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## Check List **Please read and check followings before submitting a PR.** - [ ] I want to publish my theme on Hexo official website. - [ ] I have...