Meta Data Systems interview questions

The interview process is to solve two algorithm questions, which are the same questions in the leetcode. They are in the facebook tag of leetcode, the 150 questions with the highest frequency. I finished one of them and I failed the interview

Process is very long, you go through over 6 different interviews up to 9, the process takes about 4 months to complete, but you do sit and talk with highly skilled people from all different fields in the company