Dancing Links

(Exact Cover)[https://en.wikipedia.org/wiki/Exact_cover]

(精确覆盖问题)[https://baike.baidu.com/item/精确覆盖问题/15668873?fr=aladdin]

算法:X算法

实现:(Dancing Links)[http://www.cnblogs.com/grenet/p/3145800.html]()

(数独解法)[http://www.cnblogs.com/grenet/p/3163550.html]

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