- Refactor into modern C++ style.
- Use RAII to manage the lifetimes and GC of objects.
- Replace lisp-style lists with the STL lists.
- Release the lab environment on DockerHub.
- Complement missing function in canon.
- Fix compile-errors in main.cc.
- Delete deprecated grade scripts.
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Modify test scripts to prompt zero scores if the testcases and refs folders can't be appropriately linked.
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Add change logs file.
- The first published version.