G.Finding the Radius for an Inserted Circle 2017 ACM-ICPC 亚洲区（南宁赛区）网络赛
地址：https://nanti.jisuanke.com/t/17314题目：Three circlesC_{a}Ca,C_{b}Cb, andC_{c}Cc, all with radiusRRand tangent to each other, are located in two-dimensional space as shown in Figur...
