Statement

Luca knows that to become a good scientist he has to read a lot of papers in his field. However, it is always challenging to find the right balance between reading what other researchers have published and doing your own work! To tackle this problem systematically, he has decided to organize in advance all the reading work for the next L days. He has collected N papers that he wants to read, each consisting of P_i pages for i=0… N-1, and he has divided them into two groups. The first group comprises "the classics": foundational papers that can be read at any time. The second, instead, includes papers on recent hot topics, whose relevance vanishes after a given deadline D_i. For convenience, we indicate D_i = -1 when there is no deadline, and D_i = d (with d between 0 and L-1) when the deadline is d days in the future from today...