TikTok Software Engineer Internship interview questions

In the beginning, both sides briefly introduced themselves. The interviewer then asked a few questions regarding the resume. Then I'm required to solve 2 array questions with an increasing difficulty in about half an hour.

Questions were fair for an internship OA. But 2/3 of the questions had broken test cases. Could not test code. Constantly encountering runtime error in their Solution Class. If Tiktok could fix this it would be nice.