// 入栈后栈仍保持单调递增（因为小的都被弹走了）
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，这一点在91视频中也有详细论述
// 易错点3：升序排序 → 逻辑完全错误（无法保证"后车不超车"的前提）
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.
扎根黄土地的岁月，让青年习近平“懂得了什么叫实际，什么叫实事求是，什么叫群众”。因而，“今后如果有条件、有机会，我一定要从政，做一些为老百姓办好事的工作”。