Meta Software Engineer New Grad interview questions

First round coding interview. The interviewee introduced the following process and himself, then a coding question was given. Similar to recursively remove all adjacent repeating characters from a string. I did it too slowly. Saw other interview shared that there should be 2 coding problems in 1 interview. But I ended up only having one problem asked. The platform they used was not IDE. The code can't be run. You'll need to say & explain what's going on with examples one line by one line. 5 min before it ended, the interviewee stopped me from coding, asking me to give questions for him.

First round is an online assessment. If passed, you move on to a behavioral interview. Lastly there is 3 technical interviews in a row. If you pass that you will receive your offer