Round 1: "The initial screening round was pleasant. Basic technical questions were asked, along with inquiries about my experience and career goals."

Round 2: "The technical assessment round was challenging yet engaging. I was given a coding task to solve within a limited time frame, and the interviewer evaluated my problem-solving skills."

Round 3: "The final round was a comprehensive discussion with the hiring manager and team members. We delved deeper into technical concepts and cultural fit. Overall, it was an enriching experience."

Explain red-black tree and create an application with that.