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.
在微信所主导的社交领域上，抖音显然从未放弃过布局。2024年3月，抖音推出“合养精灵”功能：只要与好友连续互发消息3天，双方即可点亮“火花”标识；连续互发6天，则可以邀请对方共同养一只“小火人”。随着互动天数的增加，火花数值与小火人等级同步提升；一旦超过24小时未产生互动，火花与小火人便会变为灰色，若在规定时间内未恢复互动，甚至会彻底消失。
，详情可参考WPS官方版本下载
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