（五）主动投案，向公安机关如实陈述自己的违法行为的；
The capacity of each node (how many points it can hold before splitting) controls the shape of the tree. A low capacity means nodes split early, producing a deep tree with many small cells. A high capacity means nodes tolerate more points before splitting, producing a shallow tree with larger cells.
，详情可参考同城约会
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it is worth optimising.