我在 Perl 中有以下结构:
#!/usr/bin/perl
use strict;
use warnings;
my %hash = (
'firstitem' => {
'1' => ["A","99"],
'2' => ["B","88"],
'3' => ["C","77"],
},
'seconditem' => {
'3' => ["C","100"],
'4' => ["D","200"],
'5' => ["E","300"],
},
);
我正在寻找一种方法来查找每个哈希数组中的最大数和最小数。 所以输出将是
firstitem: max:99, min:77
seconditem: max:300, min:100
我的想法是先对二级键进行排序,然后在for循环中进行冒泡排序或其他排序。看起来不是很优雅和聪明。
foreach my $k1 (keys %hash) {
my $second_hash_ref = $hash{$k1};
my @sorted_k2 = sort { $a <=> $b } keys %{$second_hash_ref};
foreach my $i (0..$#sorted_k3){
#bubble sort or other sort
}
}
最佳答案
List::Util是提供min
和max
函数的核心模块:
use strict;
use warnings;
use List::Util qw(min max);
my %hash = (
'firstitem' => {
'1' => ["A","99"],
'2' => ["B","88"],
'3' => ["C","77"],
},
'seconditem' => {
'3' => ["C","100"],
'4' => ["D","200"],
'5' => ["E","300"],
},
);
for my $key (keys(%hash)) {
my @numbers = map { $_->[1] } values(%{$hash{$key}});
printf("%s: max: %d, min: %d\n", $key, max(@numbers), min(@numbers));
}
输出:
firstitem: max: 99, min: 77
seconditem: max: 300, min: 100
https://stackoverflow.com/questions/46534911/