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Index finite lists of positive integers: Difference between revisions
Index finite lists of positive integers (view source)
Revision as of 21:03, 9 May 2014
, 10 years ago→{{header|J}}
(note about the many ways to solve the task) |
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=={{header|J}}==
'''Explicit version'''
Implementation:
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Whether this is an efficient representation or not depends, of course, on the nature of the list being represented.
'''Tacit version'''
Implementation:
<lang j> rank =. 11&#.@:>@:(,&:>/)@:(<@:(10&,)@:(10&#.^:_1)"0)@:x:
unrank=. 10&#.;._1@:(11&#.^:_1)</lang>
Example use:
<lang J> rank 1 2 3 10 100 987654321 135792468107264516704251 7x
10859468893418553562739357752202339093235635587121336
unrank 10859468893418553562739357752202339093235635587121336x
1 2 3 10 100 987654321 135792468107264516704251 7</lang>
=={{header|Perl 6}}==
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