Google

The interview was excellent and very supportive. He helped whenever needed. When I was stuck on a question, he even helped me out by giving me hints, which was required to solve the problem.

It took a really long time. I went through four rounds of interviews. At last, they said they were prepared to give me an offer; however, they needed one more round of interviews. The very last interview also went smoothly. I completed every question

Too many rounds and too strict. I know that it is Google, but it's very obvious that the only way to get in is to know someone from the inside and not actual talent.