某石油公司计划建造一条由东向西的主输油管道。该管道要穿过一个有n口油井的油田，从每口油井都要有一条输油管道沿最短路经(或南或北)与主管道相连。如果给定n口油井的位置,即它们的x坐标（东西向）和y坐标（南北向）,应如何确定主管道的最优位置,即使各油井到主管道之间的输油管道长度总和最小的位置?证明可在线性时间内确定主管道的最优位置-An oil company plans to build a from east to west of the main pipeline. The pipeline

一个小小进程，学习用不错。新手上道请多多指教-A small process, learning to use well. Newbie advice please on the Road

道路放样要素计算.能够对道路平面放样要素进行自动计算,包括直线段/圆曲线段/缓和曲线段等,为外业施工提供了方便.-Lofting calculation of road elements. Lofting flat road to automatic calculation of factors, including the line segment/circle curve paragraph/paragraphs, such as curve for the field to provide