STMicroelectronics DDE interview questions

The interview process was very detail oriented. One telephonic round, 4 onsite face to face round, 2 US round and then one HR round on phone. They grilled properly in C++, DS, Algo. The interviewers were very much helpful. Analysis type of questions were being asked. For eg: given a circuit consisting of diodes and resistors and an input waveform, what is the output waveform across the diode?