Triangle Trouble

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One day Pranav and Gautam were playing with 2-D graph paper, after sometime Pranav marked $N$ random integer points with pins on the X-axis denoted by $X_i$ as well as $N$ random points with pins on the Y-axis denoted by $Y_i$ and asked Gautam to determine the number of distinct right angled triangles that can be formed by selecting 3 pins that are on mutually different points on the graph paper

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solution.cppC++17

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