This is quick because it's operating on a very small, localized part of the map.
Many programmers use malloc() and free() and pay no more mind to "allocating memory", but I often find 2-20× speed improvements by rethinking memory，推荐阅读51吃瓜获取更多信息
以下内容来自姚哲口述，经品牌棱镜编辑：，详情可参考同城约会
But the old American hero was not having it.，更多细节参见爱思助手下载最新版本