An optimized implementation of the 1-cover problem [class under review].
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`#include <adobe/dancing_links.hpp>`

## Detailed Description

- The implementation is based on the Dancing Links Algorithm paper published by Knuth:

- http://www-cs-faculty.stanford.edu/~knuth/papers/dancing-color.ps.gz

- This class is an implementation of the "1-cover" problem:

*Given a matrix of 1s and 0s, is there a subset of the rows such that there is one and only one 1 in each column?*

- It turns out a lot of interesting problems can be encoded in such a way that the 1-cover algorithm can be used to solve them (For example, counting the number of possible solutions to a Sudoku puzzle). Knuth talks in general about exact-cover problems (placing dominoes on a chessboard, the N-queens problem, etc.), and how each of these are specializations of the 1-cover problem, and so can be solved by this algorithm.