laziness, impatience, and hubris PerlMonks

### Comment on

 Need Help??
I am workong on a school assignment that involves testing all the different combinations of array elements in @speeds. Currently I am using this code to do that:
```use strict;
use Math::monthly::CarClumps qw\count\;

my ( @order , @clumps,
\$total , @speeds );

# speed of cars
@speeds = ( 50 .. 59 );
# initialize @clumps as {0}
@clumps = (0) x ( @speeds + 1 );

clumps ( @speeds );

foreach my \$i ( 1 .. \$#clumps )
{ print \$i + \$speeds[0] - 1, " :\t\$clumps[\$i]\t( ",
( \$clumps[\$i] * 100 / \$total ), "% )\n" }
print "total :\t\$total ( = ", scalar @speeds, "! )\n";

exit 0;

sub clumps {
my @cars  = @_;
if ( scalar @cars eq 0 )
{ \$clumps[count(@order)]++; \$total++ }
else
{ foreach ( 0 .. \$#cars)
{ my \$speed = pop @cars;
unshift @order, \$speed;
clumps( @cars );
unshift @cars, \$speed;
}
}
shift @order;
return 0;
}
The clumps() sub uses a tree recursion model which is really slow (particularly on a 90mhz box). Has anyone had to do a similar thing and can suggest a better model for testing all the combinations of @speeds?

In reply to Finding all Combinations by narse

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