Tim and beautiful function

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Tim is very good at maths. One day he found a beautiful function - f(n) = -1 + 2 – 3 + ... + (-1n)*n Help him make a program which computes the value of f(n) for a given integer n. ###Input: - The single line contains a positive integer n. ###Output: Print f(n) in a single line. ###Constraints - 1 15 ###Sample Input: 4 ###Sample Output: 2

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solution.cppC++17

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