Walmart Global Tech Data Engineer interview questions

Interviewed for Walmart Bangalore in July. First round was based on DS/Algo questions. I was given 2 questions to solve but there was enough time to solve only one (since the interviewer himself was quite late). I described the solution for the second one. The interviewer seemed in a hurry to wrap up the interview and didn't seem interested in the process. Although I answered the questions, gave the optimal solution but still got a NO from Walmart (that too after I contacted them after a few days) with no explanation whatsoever about what went wrong. Interviewers do seem to have some crammed up answer/approach for a specific question in their mind and anything you say that's even a bit different from that would just make them disinterested. A pretty negative experience on the whole. Do not get your hopes up even after performing well. They seem to decide who to choose on the basis of a coin toss at the end of the day.