第二盏灯：位置在右下方 (1, -2, -4)，负责照亮物体的背面或暗部。
The spatial view (the grid of rectangles) and the tree view (the hierarchy of nodes) represent the same structure. Searching for a point means walking down the tree: at each node, you check which of the four children contains your target coordinate and recurse into that child. You never visit the other three.。业内人士推荐爱思助手下载最新版本作为进阶阅读
，详情可参考WPS官方版本下载
Жители Санкт-Петербурга устроили «крысогон»17:52
for (int i = 0; i <= max; i++) {，详情可参考Safew下载