Knight's tour: Difference between revisions
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Warnsdorff’s rule, with random tie-breaks. The program keeps trying
until it finds a solution. Running time can vary a lot.
Beware the program writes to a file ‘__random_number__’ in the working directory. (This can be avoided in GNU m4 by using ‘esyscmd’ instead of ‘syscmd’. I do not know how to avoid it in general.)
<lang m4>divert(-1)
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