Necklace

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The jeweler Richie Rich has a special way to price the value of a necklace. If the necklace is decorated with gemstones, he unhooks the necklace and places it on the table in a straight line. According to him a necklace is as valuable as there are "pretty" pairs of gemstones in it. Richie knows 26 gemstones exist and has named them with the letters from "a" to "z". He writes down the letters, corr

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solution.cppC++17

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