The quadtree is the two-dimensional case of a broader family of space-partitioning data structures. Octrees extend the same idea to three dimensions (splitting cubes into eight children), KD-trees use alternating axis-aligned splits (splitting along x, then y, then x again), and R-trees group nearby objects into bounding rectangles. Each variant makes different tradeoffs between construction time, query speed, and update cost.
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，更多细节参见Line官方版本下载
* - this.stack：单调递减栈，存储「价格对应的索引」，栈顶→栈底索引对应的价格单调递减，详情可参考同城约会
我曾说，“当自己不骗自己的时候，真正的改变就开始了。”但现实中，很多人都在“熬一熬、等一等”，寄希望于市场好转、或者品牌方给出解决方案。事实上，当品牌支持不足时，门店能否主动自救，服务好每一位客人，这才是生存的关键。