Ciel and Map

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Tomya is a girl. She loves Chef Ciel very much. Tomya writes a tetragon (see the below Notes 1 for details) in her map. The map has N points, whose coordinate are (Xi, Yi), denoting Ciel's restaurants. Each vertex of the tetragon written by Tomya is one of the Ciel's restaurants. Tomya doesn't show her tetragon in the map, but she says that she draws a long segment. To guess her tetragon, please

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solution.cppC++17

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