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Re: how to sort string in perl

by roboticus (Chancellor)
on Dec 05, 2012 at 11:41 UTC ( #1007276=note: print w/ replies, xml ) Need Help??


in reply to how to sort string in perl

Priti24:

This should provide you a couple hints:

$ cat bozosort.pl #!/usr/bin/perl use strict; use warnings; my @list = (1, 2, 3, 9, 6, 4, 5, 7, 0); while (@list) { my $idx = int rand @list; next if grep { $list[$idx] > $_ } @list; say splice @list, $idx, 1; }

On my machine, this produces:

$ perl bozosort.pl 0 1 2 3 4 5 6 7 9

You'll want to make appropriate changes to improve performance, use files, etc.

Update: Hung a lantern on it.

...roboticus

When your only tool is a hammer, all problems look like your thumb.


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Re^2: how to sort string in perl
by Anonymous Monk on Dec 05, 2012 at 17:44 UTC

    I like stooge sort more. It can be much more efficient: I used functional-programming techniques which means it can be trivially parallelised over many CPUs.

    sub stoogesort { my (@lst) = @_; if ($lst[-1] < $lst[0]) { # swap @lst[0, -1] = @lst[-1, 0]; } return @lst if (@lst < 3); # thirds my $zero = 0; my $one = int(@lst / 3); my $two = int($#lst * 2 / 3); my $three = $#lst; for my $range ( [ $zero .. $two ], [ $one .. $three ], [ $zero .. $two ] ) { @lst[ @$range ] = stoogesort( @lst[ @$range ] ); } return @lst; } my @list = (1, 2, 3, 9, 6, 4, 5, 7, 0); print join(" ", stoogesort(@list)), "\n";

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