Gemstones

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Dhruv loves rare gemstones. Dhruv wants 3 different gemstones with their rarity **a**,**b**,**c**. Such that **a**,**b**,**c** are in GP with common ratio **r** . - So, Dhruv decided to buy 3 gemstones from a shop. This shop has N different gemstones with their rarity defined. Find in how many ways Dhruv can choose these 3 gemstones A[ **i** ] , A[ **j** ], A[ **k** ] such that (**1** ≤ **i** < **

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solution.cppC++17

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