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Ingy döt Net 2013-04-10 23:57:08 -07:00
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commit b83f433714
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Task/N-queens-problem/J/n-queens-problem.j Normal file
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perm =: ! A.&i. ] NB. all permutations of integers 0 to y
comb2 =: (, #: I.@,@(</)&i.)~ NB. all size 2 combinations of integers 0 to y
mask =: [ */@:~:&(|@-/) {
queenst=: comb2 (] #"1~ mask)&.|: perm