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Each of the two food stores, A and B, of the same company has a list of products that are available in its stock. We assume that the standard input contains NA records for food store A and NB records for food store B. Each record describes the code of … 
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A positive integer number n is said to be perfect if it is equal to the sum of its proper divisors. In other words, n is equal to the sum of its positive divisors excluding itself. For example, 6 and 28 are perfect numbers. Indeed, we have: 6 = 1 …
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