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Does Python optimize tail recursion?
...s to be able to have proper tracebacks:
Tail Recursion Elimination (2009-04-22)
Final Words on Tail Calls (2009-04-27)
You can manually eliminate the recursion with a transformation like this:
>>> def trisum(n, csum):
... while True: # Change recursion to a while...
Given a number, find the next higher number which has the exact same set of digits as the original n
...in the correct place in O(n)).
An example will make this more clear:
123456784987654321
start with a number
123456784 987654321
^the first place from the right where the left-digit is less than the right
Digit "x" is 4
123456784 987654321
^find the smallest dig...
Bash continuation lines
...
164
This is what you may want
$ echo "continuation"\
> "lines"
continuation lines
...
How do I check if a number is a palindrome?
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answered Oct 13 '08 at 22:14
Dan DyerDan Dyer
50.6k1616 gold badges124124 silver badges164164 bronze badges
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String literals and escape characters in postgresql
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edited Mar 4 '10 at 23:08
answered Aug 4 '08 at 1:07
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Is there a common Java utility to break a list into batches?
...sz NurkiewiczTomasz Nurkiewicz
301k6060 gold badges648648 silver badges639639 bronze badges
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psql invalid command \N while restore sql
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edited Jul 24 '17 at 21:35
answered Dec 6 '13 at 16:13
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Why is processing a sorted array faster than processing an unsorted array?
...visualization:
T = branch taken
N = branch not taken
data[] = 0, 1, 2, 3, 4, ... 126, 127, 128, 129, 130, ... 250, 251, 252, ...
branch = N N N N N ... N N T T T ... T T T ...
= NNNNNNNNNNNN ... NNNNNNNTTTTTTTTT ... TTTTTTTTTT (easy to predict)
However, when t...
Sorting a tab delimited file
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answered Jun 24 '09 at 10:10
Lars HaugsethLars Haugseth
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