Amazon | SDE1 | Online Round

I applied for an SDE1 position on the Amazon Alexa team via LinkedIn. A few days later, I received an invitation for an online coding round hosted on the HackerRank platform. The round comprised two coding questions, and for each, I had to explain my approach and state the time and space complexities. The first question was essentially the Reorder Data in Log Files problem from LeetCode, with only minor adjustments to the wording. The second question was new to me: 'Given a binary string, find the number of 3-size binary subsets that are alternate. For example, for '01010', the expected output is 5.' I attempted to solve this recursively, but many test cases unfortunately failed due to a time limit exceeded error. Initially, I received no response after the round and, after following up with the recruiter and being ghosted, I assumed I was rejected. However, I later received a call from Amazon informing me that they had decided to move forward with my candidature.