Wow, I like that -- thanks much!
  1. Guaranteed O(n) -- right now, the comparisons are about 120% of n with normative mergesort and 102% of n with quicksort.
  2. I can pop those into the new array meaning the memory use will remain flat (rather than temporarily doubling). 

my @bucket = ();
while($#Notes >= 0) {
    my $n = shift @Notes;
    push @{$bucket[$n->{terms}-1]},$n;
}
#Need 1D array back:
while($#bucket >= 0) {
    my $b = pop @bucket;
    push @Notes, shift @$b while ($#{$b} >= 0);
}

[download]
Works perfect.

In reply to Re^2: sort != sort by halfcountplus
in thread sort != sort by halfcountplus

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