export PATH="$SCRIPT_DIR/nodejs/bin:$PATH"
输入：target = 12, position = [10,8,0,5,3], speed = [2,4,1,1,3]
，这一点在heLLoword翻译官方下载中也有详细论述
Will other retailers have spring sales?When Amazon launches a sale, it kicks off a game of follow the leader. All the other big retailers — Best Buy, Target, and Walmart — have historically launched spring sales around the same time as Amazon's Big Spring Sale. No official sale announcements have come through yet, but we expect they'll come soon.
A quadtree does the same thing for two-dimensional space. It takes a rectangular region and divides it into four equal quadrants: northwest, northeast, southwest, southeast. If a quadrant has too many points in it, it subdivides again and again. Each subdivision creates smaller and smaller cells where points are densely packed.