Chef and Beautiful Pairs

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Given an array A[] of N integers. Your task is to find the maximum number of Beautiful Pairs that exists in a Beautiful collection. A Beautiful collection is the set of integers that have the same first and last digit. for eg: {123, 1453, 163} forms a beautiful collection because all the integers in the set has same first digit '1' and same last digit '3'. {121, 323} isn't a beautiful collection

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solution.cppC++17

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