OPI: 4 rounds total.

• 3 rounds of technical interviews
• 1 round with HR

For the first 2 rounds, there were 2 interviewers each. For the last 2 rounds, there was 1 interviewer each.

Each round took approximately 1 hour, except for the last one.

Round 1: Reverse Integer, Valid Parentheses (LeetCode 20) (two interviewers)

Round 2:

1. Design a horse racing system.
2. Given a height matrix, decide whether rain can flow from the inside to the left and right margins (two interviewers)

Round 3: Talk with a manager. Some behavioral questions. How to find the kth largest number in an unsorted array.

Round 4: Talk with HR. Behavioral questions.