There were two codes to write, one was medium hard and another was easy one. An easy question was also given which was related to machine learning. It was slightly difficult for me because I thought I cannot do the medium hard one within 1 hrs time, so I submitted it within 35 minutes! Well, I regret that decision but I admit my lack of preparation on medium hard problems at that time. However they were not actually difficult coding challenges, I could or anyone can do them if they can keep their cool and practise enough.