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.
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int n1 = mid - left; // 左子数组长度。旺商聊官方下载对此有专业解读
qemu-system-x86_64 -m 8G -cpu host -smp 4 -boot d -cdrom ./output/bootiso/install.iso -hda vm_disk.qcow2 -netdev user,id=mynet0 -device e1000,netdev=mynet0 -serial stdio -enable-kvm
* @param high 结束索引