Introduction to OJ at Home and Abroad

I will not introduce the mainstream ones such as poj, zoj, hduoj, hoj, and HUST! Below we will introduce a few good but few people know about OJ! Hope to help readers! The sequence below is not arranged in any order. It is written only when you see it! If anything is wrong, please forgive me !!

 

Vijos (velocious informatics judge online system)
Address:
Http://www.vijos.cn/
Introduction:
Vijos is Vivian Snow is a judge system in the Appendix of Hunan Normal University Liu Kang (personal homepage is http://www.viviansnow.cn/), originally as the works of the innovation competition, then started up, now very popular. however, vijos has many things, and the server is unstable and slow. for details about vijos, refer to Dragon. dai wrote this (http://www.mybloop.com/get/376674/Vijos.doc) at the age of 1 in vijos, and I will not repeat it here. everyone on vijos can upload their own questions. Although a lot of flexibility is added, the problem level is uneven. in addition, it is difficult for the person who uploads the question to make the same judgment when selecting the question difficulty. They all have their own personal opinions. Therefore, the difficulty of the question is a good design, but now it has become a weakness.
Recommendation level:
5

 

Tju/toJ (Tianjin University Online judge)
Address:
Http://acm.tju.edu.cn/toj
Introduction:
This is from Tianjin University, although I have never done it. In general, it is slightly worse than zoj, and the question quality is not sure (I said I did not do it too...). I usually use it for contests.
Recommendation level:
5
Recommended Practices:
None. You can perform contests. note that it is online contests instead of virtual contests, Which is virtual... open it and you will know that you are using toJ's own question library to generate a contests... in fact, this design is novel and everyone can perform tests. suitable for testing in teams...

 

Nkoj (Nankai online judge)
Address:
Http://acm.nankai.edu.cn/
Introduction:
This is the OJ of Tianjin Nankai University. Most people may not know it, right? Before reading the following introduction, you can go up and try it out. you will surely find that you will feel very comfortable with a large number of Ajax technology applications and fresh interfaces. in addition, nkoj seems to have a function that does not appear in rank list and status. This function is very considerate. the topic is the biggest weakness of nkoj, with a small quantity and a moderate quality. however, because Chinese and English questions are mixed and there are a large number of Chinese questions (compared with PKU), you can refer to vijos for Chinese questions. in fact, nkoj is much more beautiful than vijos, and the speed is slightly faster than vijos. The stability... it should be much better than vijos.
Recommendation level:
5
Recommended Practices:
Make Chinese questions.

 

Rqnoj (renqingnet online judge, Ren Qing network informatics osai (OI) online question Determination System)
Address:
Http://www.rqnoj.cn/
Introduction:
In an emerging OJ, the question quality is average and there are not many questions. In addition to ranking, There is nothing worth doing.
Recommendation level:
2

 

Next, let's talk about foreign OJ:

Sgu (Saratov State University Online contester)
Address:
Http://acm.sgu.ru/
Introduction:
Sgu is an OJ of Stanford State University (probably called this name) in Russia. the number of questions is small, but the question is refined. Each question will increase your programming level. after a certain level of programming, you can try to do it, and strive to make every question. note that status needs to be viewed through the "Status Online" link on the left, and sgu is slow and unstable. in short, it is strongly recommended!
Recommendation level:
9
Recommended Practices:
Each AC question can be done according to the AC rate.

 

Ural (timus online judge)
Address:
Http://acm.timus.ru/
Introduction:
Ural is an OJ of Ural State University. There are not many questions, but they are all original and classic. If sgu is hard-working, try Ural.
Recommendation level:
8
Recommended Practices:
Try to do each question. You can follow the AC rate.

Other OJ:

 

Hit (Harbin Institute of Technology) http://acm.hit.edu.cn/

Jlu (Jilin University Online judge system) Education Network http://acm.jlu.edu.cn/joj Netcom http: // 202.98.18.36/joj

Ultraviolet A http://acm.uva.es/problemset/

Spoj (sphere online judge) http://www.spoj.pl/

 

 

Ural, sgu, spoj, and usaco are both good and worth doing! I am also looking for a place to settle in AC!

We recommend another uestc acm online juege! This is the OJ http://www.acm.uestc.edu.cn of Emy of electronics /!

Happy AC !!!