Special Quadrilateral

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A special quadrilateral is a quadrilateral whose sum of two sides is equal to $K$ and sum of remaining other two sides is also $K$. You are given an array of length $N$ which contains the sides of a quadrilateral. You have to choose 4 indices from the array and see if sides on these indices make a special quadrilateral. Output how many different special quadrilaterals can be formed using th

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solution.cppC++17

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