Expedia SDE-3 screen — max product subarray + freq stack; reject

Just gave my Technical Screen for Expedia SDE3 position, and was asked the following questions :

1. https://leetcode.com/problems/maximum-product-subarray/
2. https://leetcode.com/problems/maximum-frequency-stack/

The interviewer was not interested at all, gave no hints and ended early when I wasn't able to come up with an optimal solution with 20 mins left.