Your decision line needs to be: 
    my $decision = grep($h{$$ar2[$_-1]} > $h{$$ar2[$_]}, 1..$#{$ar2}) 
+? 0 : 1;

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You have to take into account the elements order with respect to each other. In this case, pos1 <= pos2 <= pos3 ...

In reply to Re: How to Test if Two Arrays are Ordered in the Same Way by jdhedden
in thread How to Test if Two Arrays are Ordered in the Same Way by monkfan

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