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# %result 是一个二维Hash
print $result{"a"}{"b"};
# 这样得到一维得key数组
my @row = sort keys %result;
#怎么得到二维的key呢?
use strict;
use warnings;
my %hash=(a=>{1=>10,2=>20},b=>{3=>30,4=>40});
foreach my $key1 (keys(%hash))
{
print("\$hash{$key1} has keys:".join(',',keys(%{$hash{$key1}})),"\n");
}
my %result;
$result{"a"}{"b"}=1;
$result{"a"}{"c"}=1;
my @a = keys %{@result{keys %result}};
print "@a";