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Sorting a list of IP addresses (aka Why I hate Big O)

by jeffa (Bishop)
on Aug 03, 2000 at 00:15 UTC ( #25833=perlmeditation: print w/replies, xml ) Need Help??

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  1. or download this
    #naive: O(N*logN)
    my @sorted = sort {
    ...
        pack('C4' => $b =~ /(\d+)\.(\d+)\.(\d+)\.(\d+)/)
    
    } @unsorted;
    
  2. or download this
    Benchmark: timing 5000 iterations of naive, packed...
         naive: 11 wallclock secs ( 9.91 usr +  0.32 sys = 10.23 CPU)
        packed:  8 wallclock secs ( 7.95 usr +  0.08 sys =  8.03 CPU)
    

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[LanX]: yep
[LanX]: 1234567890 1234567890 1234567890
[LanX]: so inserting own whitespace helps, ie. a JS warning on submit could help preventing problems
[LanX]:  last hour of cb doesn't break

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