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洛阳钼业此前以铜、钴、钼、钨、铌为主业，黄金业务尚未形成独立板块。然而，在全球货币体系波动加剧、地缘政治风险上升的背景下，黄金作为“终极避险资产”的战略属性日益凸显。
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There is a special form for boolean formulas called "Conjunctive Normal Form" (CNF). A problem in this form consists of clauses connected with and operators, where each clause only contains variables connected with or operators. The variables can appear negated, but only variables can be directly negated, something like !(a && b) is not allowed. An example boolean formula in CNF form is:
With a thousand points, you barely notice the delay. With a million, you're doing a million distance calculations for every single query. On a phone updating the map as the user scrolls, that's untenable.