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// 此时栈顶就是当前元素的"下一个更大值"（栈空则保持默认值0）。关于这个话题，雷电模拟器官方版本下载提供了深入分析
This is the same idea behind binary search. In a sorted array, you compare against the middle element and eliminate half the remaining candidates. In a quadtree, you choose one of four quadrants and ignore the other three regions. Each level narrows the search space by a factor of four instead of two.，这一点在同城约会中也有详细论述
(~70 host syscalls from Sentry)
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