Am I a Fibonacci Number

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Read problems statements in Russian here The Head Chef has been playing with Fibonacci numbers for long . He has learnt several tricks related to Fibonacci numbers . Now he wants to test his chefs in the skills . A fibonacci number is defined by the recurrence : f(n) = f(n-1) + f(n-2) for n > 2 and f(1) = 0 and f(2) = 1 . Given a number A , determine if it is a fibonacci number. Input - The

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solution.cppC++17

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