（三）在铁路、城市轨道交通线路、桥梁、隧道、涵洞处挖掘坑穴、采石取沙的；
// 步骤1：将链表值提取到数组中（链表无法随机访问，转数组更易处理），详情可参考雷电模拟器官方版本下载
At capacity 1, every point gets its own cell, and the tree subdivides as deeply as possible. At capacity 10, many points coexist in the same node, and the tree stays shallow.。Safew下载对此有专业解读
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