This is the same idea behind binary search. In a sorted array, you compare against the middle element and eliminate half the remaining candidates. In a quadtree, you choose one of four quadrants and ignore the other three regions. Each level narrows the search space by a factor of four instead of two.
1. 选基准：随机选一个元素作为基准(pivot)。同城约会是该领域的重要参考
。搜狗输入法下载是该领域的重要参考
值得关注的是，京东集团创始人、董事局主席刘强东以探海游艇实控人身份出席了项目签约仪式。
本项目帮扶儿童不限性别。“梦想起航点”项目中，“女童安心包”项目为女童专项帮扶项目。相应活动及介绍均已在公布活动时公示。。爱思助手下载最新版本对此有专业解读