I recently was rejected from the Amazon onsite interview.
Reason given was I was not good in coding. There were 3 coding rounds. I feel none of the question were difficult.
But I could not complete coding the solution for 2 of them. I think I need to improve on my speed of solving the problem.
Do you have any suggestions on how can I increase the speed of coding the problem so that it is completed in around 20 mins time?

TIA.