I had two rounds of online technical interviews, with two sessions for each round, and each session lasted one hour. All of the interviews focused on problem-solving using data structures and algorithms.

I performed quite well in the first three sessions. I had great conversations, and the technical problems were solved optimally. In the last session, I interviewed with a senior manager. The problem-solving question presented had a poorly stated problem statement and example. I struggled to understand the problem, and the manager's attempts to explain it were not very helpful.

At last, I managed to solve the problem in time. I asked the manager some questions and ended the interview session.

A week later, I received a rejection email. When I asked for feedback, it turned out I had failed the last interview because "my coding skill is not that good."

In my opinion, this is strange. The company claims to be a "flat organization" where they "promote" employees to be involved in decision-making processes. However, during the interview process, there is still an "one-above-all" authority figure who makes the final decision, even if the rest of the team might say otherwise.

Create a function that can reverse an array of integers.

Given a string, the task is to remove all duplicate pairs of adjacent characters from the given string.

Given a reversed tree where each node is pointed to its parent, find the maximum depth of the tree.