Some diseases cannot be spread unless there is a direct contact with the infected person. Using  information of direct contact between every pair (Pi, Pj) of n people, describe an algorithm with  appropriate data structure to determine person Pj could be reached by a sequence of direct contacts  stating from Pi. Estimate the time complexity of the algorithm.

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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1. Design an algorithm to test whether there is at least one common element between two sets of numbers. 
Using appropriate data structures estimate the time complexity of the algorithm. 


2. Some diseases cannot be spread unless there is a direct contact with the infected person. Using 
information of direct contact between every pair (Pi, Pj) of n people, describe an algorithm with 
appropriate data structure to determine person Pj could be reached by a sequence of direct contacts 
stating from Pi. Estimate the time complexity of the algorithm. 

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