Thanos and the Infinity Stones

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In the near future, Thanos goes on a killing spree to collect all the infinity stones and the only stone the Avengers finally have a hold of is the Time Stone. To save the universe, they decide to use it to go back in time whenever necessary without causing severe changes to the laws of nature. Help them by answering a few queries. The infinity stones are numbered with indices starting from 0. As

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solution.cppC++17

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