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# определяем, лежат ли точки в одной координатной четверти
if (x1 > 0 and x2 > 0 and y1 > 0 and y2 > 0) or (x1 < 0 and x2 < 0 and y1 < 0 and y2 < 0) or (x1 < 0 and x2 < 0 and y1 > 0 and y2 > 0) or (x1 > 0 and x2 > 0 and y1 < 0 and y2 < 0):