For a novice like me, I have done a lot of OJs. I would like to recommend to you my current use of OJs. First of all, I use OJs in two parts: solving questions and competing. Writing questions: Jiaozuo No. 1 Middle School OJ (not open to the public), luogu, loj, acwing. You can use these four OJs. For example, if your OJ needs to host a school-wide competition, the OJ you write should be suitable for the size of the entire school. The architecture used should be suitable for access by so many people (however, there is also medium-sized concurrency), and the matching server should also be suitable for so many people. Preface Facts have proven that in every class, every few years, in colleges and universities across the country, there will be some people with lofty ideals who plan to develop an OJ for the purpose of improving themselves or serving their alma mater. We are certainly no exception. So, looking at the present, 2020, what kind of characteristics does a person have?
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