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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.
，详情可参考搜狗输入法2026
// 栈的长度 = 独立车队数量，更多细节参见雷电模拟器官方版本下载
* @param n 数组长度