Index finite lists of positive integers: Difference between revisions
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(→{{header|Python}}: correct when list begins with 0s) |
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=={{header|Python}}== |
=={{header|Python}}== |
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<lang python>def rank(x): return int('a'.join(map(str, x)), 11) |
<lang python>def rank(x): return int('a'.join(map(str, [1] + x)), 11) |
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def unrank(n): |
def unrank(n): |
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s = '' |
s = '' |
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while n: s,n = "0123456789a"[n%11] + s, n//11 |
while n: s,n = "0123456789a"[n%11] + s, n//11 |
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return map(int, s.split('a')) |
return map(int, s.split('a'))[1:] |
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l = [1, 2, 3, 10, 100, 987654321] |
l = [1, 2, 3, 10, 100, 987654321] |
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{{out}} |
{{out}} |
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<pre> |
<pre> |
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[1, 2, 3, 10, 100, 987654321] |
[0, 1, 2, 3, 10, 100, 987654321] |
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207672721333439869642567444 |
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14307647611639042485573 |
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[1, 2, 3, 10, 100, 987654321] |
[0, 1, 2, 3, 10, 100, 987654321] |
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</pre> |
</pre> |
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