Gaurav and Rearrangements

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Gaurav loves rearranging digits. Today it’s Gaurav’s birthday so his friend Kunal has given him a task to keep him happy and engaged. He is given N digits (not necessarily unique). Gaurav has to find the sum of all numbers obtained by rearranging the given digits taken all at a time. In other words, Gaurav has to find the sum of all N digit numbers obtained from the digits. Also, if two or more di

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solution.cppC++17

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