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#!/usr/bin/perl
use strict;
...
map { print "\$r{$_->[0]}{$_->[1]} ==> $r{$_->[0]}{$_->[1]}\n" }
map { [$_,(sort { $r{$_}->{$b} <=> $r{$_}->{$a} } keys %{$r{$_}})[0]]}
  keys %r;

$r{456}{d} ==> 7
$r{123}{a} ==> 3

my %rmax;
$rmax{$_} = (sort { $r{$_}->{$b} <=> $r{$_}->{$a} } keys %{$r{$_}})[0]
  for keys %r;
print "\$r{$_}{$rmax{$_}} ==> $r{$_}{$rmax{$_}}\n" for keys %rmax;

$r{123}{a} ==> 3
$r{456}{d} ==> 7