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Games and physics simulations need to detect which objects are touching or overlapping. With nnn objects, checking every pair is O(n2)O(n^2)O(n2) comparisons, which gets expensive fast. A hundred objects means roughly 5,000 pair checks. A thousand means nearly 500,000.
第七条 国务院林业草原主管部门和有关部门按照职责建立健全自然保护区相关技术规范和标准体系，依法组织制定并适时修订自然保护区相关技术规范和标准。，这一点在WPS下载最新地址中也有详细论述