Tucao the pros and cons of major question banks

No.1: Los Valley

Luogu is a very good website, and Luogu's original titles are still very good. There are many questions, and the submission of major question banks is also supported, but some Luogu's original questions are too cancerous. Similarly, it is also a good social platform. It's that the Luogu administrator title is crazy . Part of the data is public, and monthly competitions are held every month.

No.2：CodeForces

There are many competitions, and the quality of the questions is very good, but foreign websites need a strong foundation in English or reading comprehension (after all, there are too many language problems with machine translation). And $CodeForces$ also has many entertaining games, which are very fun. The data is open, but some big data is incomplete, so some skills are required.

No.3 ：POJ

The website of Peking University has a good topic, but it is in English. The above questions are in major $OJ$ can still find a translation. The data is not public.

No.4：AtCoder

It is also a contest-based question bank. The quality of the questions is very good, but the data is not public, and it is inconvenient to submit questions.

No.5: Niuke.com

This is the page of Niuke.com. You must log in to enter. Niuke.com is originally a blog, but the question bank is very comprehensive and there are many competitions. It is a good website. But the data is not public.

No.6 ：LOJ

LOJ LOJ The interface of$L$$O$$J$ is very clear, many$OJ$ are all used$LOJ$ 's board. The above questions are not very complete, but the data in this question bank is completely public, which is very suitable for debugging.

No.7 ：LeetCode

This website should be ranked very high, but we put it here. Why do I say it should be placed very front? Because this website has a lot of competitions, and the questions range from simple to difficult, covering a lot of question types, and it is not cancerous. But this question bank is all interactive questions, not suitable for the informatics Olympiad.

No.8 ：COJ

A website that is not very popular, but the topic is very good, it is worth seeing.

No.9：VJ

This is not very popular either. It contains a lot of questions from the question bank. You can use this if you give up on foreign websites because they want to overcome the wall. This question bank is directly in the original $OJ$ evaluation and return to on, and does not require you to register a primary$OJ$ 's account number. This is completely a question bank, there is no competition and problem solution, you have to do these two Uehara$OJ$。

No.10 ：XJOI

The topic of Xuejun is very good, but the typesetting is a bit uncomfortable, generally $OJ$ will have its questions.

No.11：AcWing

This is a small platform built by a team built by a big man named Yan Xuecan. This small platform should not be worth mentioning, but I found that this website is very distinctive: it is more like a cloud desktop. In fact, I think some places are better than big platforms, and everyone knows it by themselves.