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sub part {
  my ($n, $m) = @_;
...
  $parts[$i++]++ while $r--;
  return @parts;
}

sub part {
  my ($n, $m) = @_;
...
  my $q = ($n-$r)/$m; # avoid int($n/$m) to prevent fp rounding errors
  return ($q+1) x $r, ($q) x ($m-$r);
}