## HDU 6242 Geometry Problem

Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 262144/262144 K (Java/Others) Alice is interesting in computation geometry problem recently. She found a interesting problem and solved it easily. Now she will give this problem to you : You are given $N$ distinct points $(X_i,Y_i)$ on the two-dimensional plane. Your task is to find a point $P$ and a real number $R$, such that for at least $⌈\frac{N}{2}⌉$ given points, their distance to point $P$ is equal to $R$. （更多…）