// 栈空 → 无更大元素，返回-1；栈非空 → 取栈顶（第一个更大值）
Add a cluster of points in one corner and watch that corner subdivide deeply while the rest of the space stays untouched. Then scatter a few points across the empty region and watch it split only where needed. The tree grows around the data.
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const curTime = posToTime.get(pos);