Keyboard Free (计算几何+自适应辛普森积分/等分圆)2020牛客多校第二场

原题题面 Given three concentric circles whose radiuses are r 1 r_1 r1​, r 2 r_2 r2​, r 3 r_3 r3​respectively, and A , B , C A,B,C A,B,C are the moving points on the given three circles respectively. Deter
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