5 lines
222 B
Text
5 lines
222 B
Text
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perm =: ! A.&i. ] NB. all permutations of integers 0 to y
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comb2 =: (, #: I.@,@(</)&i.)~ NB. all size 2 combinations of integers 0 to y
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mask =: [ */@:~:&(|@-/) {
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queenst=: comb2 (] #"1~ mask)&.|: perm
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