Magical coins

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Shubhadeep is an archaeologist. He found N Coins from an archaeological site. After several days of research, he found that the coins are magical. If we combine any two coins the value of the newly formed coin becomes double of the summation of those coins. For example, if we combine coins with value 3 and 4, the newly formed coin will have value of 14. Shubhadeep works for a secret organization

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solution.cppC++17

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