ZS Associates Software Developer interview questions

I interviewed for ZS in november 2017, it was an oncampus drive. It was a 2 day process but firstly one has to appear for a technical coding round you wll be given a question which you have to complete in 45 mins with all the test cases cleared, if any of the test cases are failed you will not be shortlisted. After this round 7 of us were selected. Next we have to give 3 more rounds a technical interview, case study and finally the hr interview. I was rejected from thr hr interview....they only selected 2 of the candidates from 50 candidates as far as i remember. Coding round consist of questions related to strings i.e. like anagrams, sorthing,etc.

First round is technical round they shortlisted some people. next round is technical interview after that case study was given then review . after that senior company person take interview . if you clear all rounds then you are placed..