Write a program to determine the center of a set of N points. For each point, we compute the distances between it and the rest N-1 points; the maximum distance is referred to as the offset of this point. Among all N points, the point with the minimum offset is the center of these points. If more points than one have the same minimum offset, output the one with the smallest x-coordinate. If they have the same x-coordinate, output the one with the smallest y-coordinate.

撰寫程式以找出一組點的中心點。您將得到一組N個點的座標 (x, y)。對於每個點，您必須計算出它到其他所有點距離中的最大值，該最大值稱為該點的偏移量。所有N個點中，偏移最小的點即為中心點。如果多點具有相同的偏移量，則中心點為x坐標最小的點。如果它們具有相同的x坐標，中心點則選擇具有最小y坐標的點。

The number of points N is a positive integer between 1 and 100. The x and y coordinates are integers between -1000 and 1000.

點的數量N是一個介於1到100之間的正整數。x 及y的坐標值是介於-1000到1000之間的整數。