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Consider a circle with center C. Two lines are drawn from an exterior point P, such that one of them is tangent to the circle at a point S, while the other intersects the circle at points Q and R. You are given co-ordinates of points P(x1,y1), S(x2,y2) and R(x3,y3). Print the length of the segment QR. In case it is impossible for segment QR of non-zero length to exist, print “-1” (without the quot

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solution.cppC++17

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