Strangely, nobody yet seems to have taken up the issue of this line in friedo's code:

    while(chomp( my $line = <NUMBERS> ) ) {

Don't do this!!

Why? Because if, for example, the last line of the file does not end with a newline, your code will ignore it (in order to undertand why, type "perldoc -f chomp" at your command line).

For a more detailed discussion of this meme, see thread 303987, in particular the comments from ChemBoy and Abigail-II.

In reply to Re^2: Find duplicate digits by Not_a_Number
in thread Find duplicate digits by Anonymous Monk

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