The spatial view (the grid of rectangles) and the tree view (the hierarchy of nodes) represent the same structure. Searching for a point means walking down the tree: at each node, you check which of the four children contains your target coordinate and recurse into that child. You never visit the other three.
思路：找「右侧第一个 ≤ cur」的元素 → 弹出所有 cur 的元素，栈顶即为折扣。最终价格 = cur - 折扣（有则）或 cur（无则）。
"It was a lot of trial and error."，这一点在WPS官方版本下载中也有详细论述
Shortcut Pre-calculation: For the most commonly used speed profiles, the travel costs (time/distance) for shortcuts between border points within each cluster are pre-calculated and stored. (Each border point effectively has an "entry" and "exit" aspect for directed travel).。Line官方版本下载对此有专业解读
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但關恆說，他農歷新年，也是他到美國後的第五個新年（春節），過得並不輕松。關恆的案件於1月28日獲批，根據程序，美國國土安全部在30天內保留上訴權利。，这一点在雷电模拟器官方版本下载中也有详细论述