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Computers and Technology, 10.03.2020 01:57 Quidlord03
You're helping a group of ethnographers analyze some oral history data they've collected by interviewing members of a village to learn about the lives of people who've lived there over the past two hundred years. From these Interviews, they've learned about a set of n people (all of them now deceased), whom we'll denote P_1, P_2,..., P_n. They've also collected facts about when these people lived relative to one another. Each fact has one of the following two forms:
For some i and j, person P, died before person Pj was born; or for some i and j, the life spans of P_i and P_j overlapped at least partially. Naturally, they're not sure that all these facts are correct; memories are not so good, and a lot of this was passed down by word of mouth.
So what they'd like you to determine is whether the data they've collected is at least Internally consistent, in the sense that there could have existed a set of people for which all the facts they've learned simultaneously hold.
Give an efficient algorithm to do this: either it should produce proposed dates of birth and death for each of the n people so that all the facts hold true, or it should report (correctly) that no such dates can exist—that is, the facts collected by the ethnographers are not internally consistent.
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You're helping a group of ethnographers analyze some oral history data they've collected by intervie...
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