siftDown(arr, n, i);
Meta 与 Google 签下十亿美元算力大单。关于这个话题，safew官方版本下载提供了深入分析
When VM=1, the protected-mode bit goes low and the Entry PLA selects real-mode entry points -- MOV ES, reg takes the one-line path. Meanwhile, CPL is hardwired to 3 whenever VM=1, so the V86 task always runs at the lowest privilege level, under full paging protection. The OS can use paging to virtualize the 8086's 1 MB address space, even simulating A20 address line wraparound by mapping pages to the same physical frames.，更多细节参见搜狗输入法2026
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Quadtrees aren't limited to point data. They can also partition regions of continuous data, like the pixels of an image.