Amazon Senior Developer interview questions

I sent CV through their portal. They scheduled phone interview. Overall process was clean and communication nice. Honestly, don't know what more to write in this section. The problem described below and I solved it in time. Yet my mistake was that I was lazy to test it properly since the code was simple and I was confident

Recruiter contacted me about open positions. I indicated I was interested in technical lead positions. Recruiter sent me a coding assessment. It was an online assessment with a 90-minute time limit. It contained problems on data structures and algorithms. Many language options were offered. The recruiter was very helpful and he shared several links to challenge questions with me. However, even after spending several hours answering the challenge questions, I still found it very difficult to complete. I completed the assessment a few days later. A day after this the recruiter emailed to say that they were moving forward with other candidates.