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perl -MTime::HiRes=time 
-E"@a=1..1e6;$t=time; ++$a[$_] for 1..1e6; printf qq[%f\n], time()-$t"
...
perl -MTime::HiRes=time 
-E"%h=map{($_)x2}1..1e6;$t=time; ++$h{$_} for 1..1e6; printf qq[%f\n],
+ time()-$t"
0.525000

perl -MTime::HiRes=time 
-E"$t=time;my @a; $a[$_]=1 for 1..1e6; printf qq[%f\n], time()-$t"
...
perl -MTime::HiRes=time 
-E"$t=time;my %h; $h{$_}=1 for 1..1e6; printf qq[%f\n], time()-$t"
1.805000