Hills and Valleys

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Chef has N numbers from 1 to N. He calls an array of integers special if the elements initially increase then decrease or the other way i.e. initially decrease then increase. He is fasinated by such arrays as he feels that they represent hills and valleys! Given the numbers that the chef has find the number of special arrays he can form using all the numbers 1 to N. Input First line contains T

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solution.cppC++17

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