in reply to Restore the original order of an array after sort and performing some funchtion on array values

you want to look at hash slice syntax. Make a hash table mapping the original to the transform like so: 
   @hash{@original} = @original

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work with them in the order you want 
   dosomethingto($_) for @hash{@sortedoriginal}

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then get the transformed results as 
   @hash{@original}

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