adRise Android Engineer interview questions

Applied through recruiter. Asked to do a Codility test by the CTO after initial phone call. Time limit is 10 hours but you can do in 3-4 as it is only 3 questions. The first one is the most tricky in my opinion. Second and third are doable. I did the first one wrong, but it passed the example, and gave the CTO a correction but never received a response from him, even after spending 3-4 hours on the whole test. Two weeks later, I was told that I didn't receive a high enough score than other candidates and was rejected. The test was mainly Java algorithms