Contact Tracing

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In order to contain the COVID pandemic, contact tracing is highly essential. A set of programmers were asked by volunteers to efficiently trace the contacts in the least possible time. This involves insertion, deletion of contacts. You are given a set of contacts as a doubly-linked list and asked to perform $Q$ queries. [Insertion and deletion of elements]. Can you help them do it? [Refer to Sampl

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solution.cppC++17

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