Tri-Coins

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Elizabeth belongs to a very rich family which owns many gold mines. Today, she brought N gold coins and decided to form a triangle using these coins. Isn't it strange? Elizabeth has a unusual way of forming a triangle using gold coins, which is described as follows: She puts 1 coin in the 1st row. then puts 2 coins in the 2nd row. then puts 3 coins in the 3rd row. and so on as shown in the given

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solution.cppC++17

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