Hofstadter Figure-Figure sequences: Difference between revisions
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m (J: cleaner efficiency implementation) |
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=={{header|J}}== |
=={{header|J}}== |
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<lang j>R=: |
<lang j>R=:_1 1 3 7 |
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S=: |
S=:0 2 4 5 |
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FF=:3 :0 |
FF=:3 :0 |
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assert. y>:0 |
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while.+./y>:R,&#S do. |
while.+./y>:R,&#S do. |
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R=: R,({:R)+(<:#R){S |
R=: R,({:R)+(<:#R){S |
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S=: ( |
S=: (i.+/_2{.R)-.R |
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end. |
end. |
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R;S |
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) |
) |
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ffr=: { |
ffr=: { 0 {:: FF@(>./@,) |
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ffs=: {: |
ffs=: { 1 {:: FF@(0,>./@,)</lang> |
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Required examples: |
Required examples: |
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