Siemens Healthineers C++ Developer interview questions

The first round was a programming round and they had given a difficult question (had to write a program for a game in 1.5 hours). Only 4 out of 30 candidates went through to the next round and I was one among them. In the technical round I answered 90% of the questions but their expectations were "text book answers" and were not checking how much a person understands the concepts. The interviewer made a mistake in a question which showed that his concepts were not clear and I pointed that out(probably this led to my rejection )

2 years experience. First Round: Aptitute & Technical MCQ + Coding Question 1. C++ technical Question on OOPs, Casting, Threading, IPC 2.coding: K distinct element in a subarray 3.coding: Singleton Class 4.coding: Character encrypting Second Round: Again Technical MCQ- hard question. Hackerearth Third Round: Interviews Interview Panel was worst ever seen of AT(R&D) department, The were unfriendly, nothelpful and prejudiced. Their talking tone was unprofessional. HR were good.