Ask HN: Does anyone use hackerrank to prepare for an interview?

I am ready to look for a job, I understand that some employers will do online tests on hackerrank, so I signed up for hackerrank, the website generated some interview preparation questions for me, currently I have completed more than 20, but the problems I found are:

1. Some questions cannot pass the test case, and the question has error. I looked at the discussion of the question, Many people have already reported that the problem exists a year or two ago and have not been resolved.

2. The descriptions of many problems are very long and difficult to understand, and are not human-readable. What I am doing now some basic problems, the solutions is not difficult, but it takes a lot of time to read and understand the topic. (Especially English is my second language)

Now I'm a little unsure if I should continue to invest time in this。Why haven't these obvious errors been fixed? What's the point of doing these brain teasers programming games?

(Please forgive that the above text is generated by Google Translate by Chinese, there may be grammatical and lexical errors, but it should not affect the expression of meaning)