（五）协助维护社会治安，组织居民参与群防群治，协助处理信访事项和协调化解矛盾纠纷，协助做好社区矫正工作和刑满释放人员帮教工作，协助做好突发事件应对工作；
The algorithm maintains a running "best distance" that starts at infinity. As it walks the tree, it checks each visited point and updates the best distance if it finds something closer. Before recursing into a child node, it checks whether the closest possible point in that child's bounding box is farther than the current best. If so, the entire subtree gets pruned.
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checks was a thing of the past—"digital substitute" documents or image-based
"tags": ",".join(item.get("tags") or []),