In English, not Perl, you'd do it by:

• For each line in the input,
  • Split the line into its pieces, separating the row ID from the data,
  • Assume the first is the biggest,
  • Walk down the indices, keeping track of which represents the largest, and
  • Report that answer

But Perl can look a lot like English if you stare at it for long enough:

foreach my $l (@line) {
  my ($row_id, @row_data) = split( /;/, $l ) ;
  my $idx = 0 ;
  do { $idx = $_ if $row[$_] > $row[$idx] } for 1..$#row_data ;
  print (1+$idx), "\n" ;
}
[download]

but there's lots of ways to do it.

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