Snapwiz Java Developer interview questions

I have been interviewed recently, on June 2018. 1st round was online coding test. Two questions I solved within 30 mins and submit. Both of them are correct. After 1 week, then called me for F2F. In F2F, a pen -paper was given to me, and I was told to write a program within 30 mins. In an optimized way I have written within 20 mins and ave submitted. Next HR told me, that next F2F round will take place for 5mins, max 10 mins. Next, the interviewer came, and started asking me about projects and all. Also he asked some very basic Java questions and SQL questions. All the question-answers I have answered, nothing I said wrong or I didn't missed any. The entire F2F took 1.5 hours, whereas HR told it would be of 5 mins round. Anyways, I was hopeful that I must have cracked this round, because all went good only. Now shockingly HR came and said me you are not selected, because the code the interviewer asked to write is not optimized. I got a 1000 volt shocked! Interviewer asked me to write only the following questions: 1. Write an example of Method overloading, method overriding 2. How to write singleton 3. A very basic RDBMS query with join. What is teh optimize way in that? Don't know! It was very bad for this unprofessional thing. I guess the post they are recruiting for is already closed, and they are taking these interviews just for namesake. Felt so bad just to waste my time likewise. I could have gone to some other product based company only instead of wasting my time likewise.