Airbnb Software Engineer Backend interview questions

The interview process is one phone screen , followed by a day of onsite. The phone screen question was difficult, however I could solve it systematically, it was a DP problem with a use case for airbnb. I found their onsite to be increasing difficult as the day progressed . They make you write real code in a pc, which in my opinion is too less of a time, given the complexity of the problems they ask. It usually advanced DP and graph problems.