An online test on HackerRank, after finishing the coding challenge, they sent me an email to inform me that my work was considered not qualified. I was very curious about the reason because the test only contains one algorithm question. And I was pretty sure that my answer should be the best. So, I wrote an email to their recruiter and asked them why I was turned down. I just wanted to know the reason and whether they could give me a better way than my solution if possible. Then, the recruiter replied to my email, and said that they had a plagiarism checker, which means they think I am a cheater and might copy the code somewhere else. At that point, I was so furious and told them that the algorithm question they gave to me is not that difficult at all. In fact, I first met this question on LeetCode. Then, this year, when I was interviewed in Microsoft China, they gave me the same question. So, at least, this question was my third time. I know the best solution, but that means I am a cheater??? So, for those people who would take their coding challenge online, I have suggestions for you guys. Do not try to do an algorithm question in the best way because the great Canva will think that you are a cheater and their successful so called "plagiarism checker" is so smart that it can tell that your code is nothing but rubbish-like copy work. I have never been so angry and disappointed like this before, their arrogant attitude is totally a disaster. I would recommend them not to use this way anymore because the better the code that candidates give, the more likely Canva will think it's plagiarism. Very funny, I write this interview experience just to let everybody know it and be fully prepared if you are going to take such an interesting online test with Canva.