Now there are many online testing platforms that provide a lot of good programming questions. Of course, the famous ACM has many difficulties. If you want to challenge your intellectual limit, if you are very interested in programming, you can register on these platforms, and then submit programming to compete with other programming experts.
Online Testing platforms often provide support in multiple languages. For a single question, you can write it in your preferred language. However, if you want to rank more advanced, you must consider the language efficiency, so you will find that the experts at the top use C ++
I am here to provide a few good platform links
These online testing platforms are mostly in English, so they can also learn English.
ACM online testing http://acm.zju.edu.cn/onlinejudge/, Zhejiang University
University of Beijing ACM online testing Co., http://acm.pku.edu.cn/JudgeOnline/.
There is also a world-class excellent online test platform http://www.spoj.pl/
These three questions are very good.
In particular, sphere provides support in dozens of languages, which is incredible.
Hangzhou University of Electronic Science and Technology Co., http://acm.hdu.edu.cn/
Taizhou University http://acm.tzc.edu.cn/acmhome/welcome.do? Method = index
They can also work together.
If you think that these platforms are all in English, you can try this.
Feiyan Forum: http://yzfy.org/
Feiyan is not as good as those, but there are tutorials, source code, and very useful for beginners.