The process started with one of the recruiters from GS contacting me about an opening. The first round was a HackerRank test. Two simple questions needed to be completed within two hours. After that, I was called for an online CoderPad round, where I had to complete two problems in one hour, including all possible test cases. The next three rounds were scheduled on the same day, one week after the CoderPad round.

On that day, I had two rounds. Afterward, I was informed that they could not proceed further without interview feedback. They should at least respect the candidate's time and provide proper interview feedback, other than just saying, 'We regret that your candidature was not found suitable for the role you applied for.' All rounds were great, except my last round, where the interviewer was too rude and unable to handle the scenario properly.

Detect the fault in the BST and rearrange it to correct.