NOI

https://cspsjtest.noi.cn/

https://blog.csdn.net/SQDPQ/article/details/142340390?ops_request_misc=&request_id=&biz_id=102&utm_term=csp-s&utm_medium=distribute.pc_search_result.none-task-blog-2~all~sobaiduweb~default-0-142340390.142^v102^pc_search_result_base5&spm=1018.2226.3001.4187

https://geek-docs.com/cpp/cplusplus/c-operator.html