Problem was not very challenging, it was of average complexity. I can not disclose what the problem was but nine hours time was given to write a single functionality (a function). Problem statement explains how functionality should work and what the acceptable status of underlying data structure is after operation. It seems, problem is very black & white and easy to implement but when you observe it closely you will find few gray areas and that is what you have to think as developer to implement functionality correctly. Test allows submitting solution one more time if first submitted solution does not work. The hardest part is, this test is not similar to the test conducted on Hackerrank type of platforms. There are no test cases in this assignment, so you cannot compare you output with expected output.
