my ($max_y) = my ($min_y) = keys(%Year);
my ($max_m) = my ($min_m) = keys(%{ $Year{$max_y} });

my $max = $Year{$max_y}{$max_m};
my $min = $Year{$min_y}{$min_m};

for my $y (keys(%Year)) {
   my $Month = $Year{$y};
   for my $m (keys(%$Month)) {
       my $v = $Month->{$m};
       if    ($v < $min) { $min = $v;  $min_y = $y;  $min_m = $m; }
       elsif ($v > $max) { $max = $v;  $max_y = $y;  $max_m = $m; }
   }
}

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Update: I was initialising $max_y twice instead of initialising $min_m. Fixed.

In reply to Re: min and max in a hash of hash by ikegami
in thread min and max in a hash of hash by nagalenoj

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