Observe.AI Software Development Engineer (SDE) interview questions

they asked me to resolve key value pair in a hash map first said that the value needs to be resolved then said key can also have a need to be resolved .the interviewer himself was adding more problems to the questions and was expecting me to have already thought of the answer.very vague way of asking the question .i was able to answer the most of questions but he never seemed to be satisfied. we were haggling for 1 hour on the same question never reached to my resume or any other questions.