Index finite lists of positive integers: Difference between revisions
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(note about the many ways to solve the task) |
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=={{header|J}}== |
=={{header|J}}== |
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'''Explicit version''' |
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Implementation: |
Implementation: |
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Whether this is an efficient representation or not depends, of course, on the nature of the list being represented. |
Whether this is an efficient representation or not depends, of course, on the nature of the list being represented. |
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'''Tacit version''' |
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Implementation: |
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<lang j> rank =. 11&#.@:>@:(,&:>/)@:(<@:(10&,)@:(10&#.^:_1)"0)@:x: |
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unrank=. 10&#.;._1@:(11&#.^:_1)</lang> |
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Example use: |
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<lang J> rank 1 2 3 10 100 987654321 135792468107264516704251 7x |
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10859468893418553562739357752202339093235635587121336 |
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unrank 10859468893418553562739357752202339093235635587121336x |
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1 2 3 10 100 987654321 135792468107264516704251 7</lang> |
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=={{header|Perl 6}}== |
=={{header|Perl 6}}== |
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