Hourglass Sand

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Chef has decided to make an hourglass using 2 pyramids. One pyramid stands upright and the second one stands inverted on the top of it to give a hourglass look. A $N$ row hourglass will be constructed in the following way : The middle row is the same for both pyramids containing only one cell numbered " 1 ". The top pyramid will use $( (N-1) / 2)$ rows and the cells will be numbered from $2$ to

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solution.cppC++17

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