精确覆盖问题 Exact cover
（重定向自Exact cover problem）
在一个全集X中若干子集的集合为S，精确覆盖是指，S的子集S*，满足X中的每一个元素在S*中恰好出现一次。
在计算机科学中，精确覆盖问题指找出这样的一种覆盖，或证明其不存在。这是一个NP-完全问题，也是卡普的二十一个NP-完全问题之一。
Exact cover problem
中文百科
英语百科
Exact cover 精确覆盖问题
（重定向自Exact cover problem）
In mathematics, given a collection 
of subsets of a set X, an exact cover is a subcollection 
of such that each element in X is contained in exactly one subset in .
One says that each element in X is covered by exactly one subset in .
An exact cover is a kind of cover.
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