Sherlock and Robberies

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Sherlock was becoming jobless. So he consulted Moriarty and asked him to plan bank robberies. But he requested him to commit the robberies in a pattern so that he could figure it out and help the police. This way he could regain his job. Moriarty being a good friend of Sherlock didn't want to disappoint him. So he committed a string of robberies in n banks numbered from a1 to an. Sherlock believe

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solution.cppC++17

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