2 lines
117 B
Text
2 lines
117 B
Text
pn =: -/@(+/)@:($:"0)@rec ` (x:@(0&=)) @. (0>:]) M.
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rec=: - (-: (*"1) _1 1 +/ 3 * ]) @ (>:@i.@>.@%:@((2%3)&*))
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