The Frictionless Bisected 2-Dimensional World

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Colonel and Erfan were walking in the Frictionless Bisected Two-Dimensional World, talking about this contest’s hardest problem. As the name implies, this world is a plane (with a Cartesian coordinate system with axes $x$, $y$) divided by an impassable infinite straight wall. The wall is infinitely thin, immovable and all collisions with it are perfectly elastic collisions. Colonel and Erfan are

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solution.cppC++17

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