摘要：
Three circles CaC_{a}Ca, CbC_{b}Cb, and CcC_{c}Cc, all with radius RRR and tangent to each other, are located in two-dimensional space as sho 阅读全文
摘要：
In this problem, we will define a graph called star graph, and the question is to find the minimum distance between two given nodes in the star graph. 阅读全文