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#!/usr/bin/env perl
use strict;
use warnings;
use experimental qw{ say postderef signatures state };
my @examples = (
{ ints => [ 1, 5, 3, 2, 4, 2 ], k => 2 },
{ ints => [ 1, 2, 4, 3, 5 ], k => 6 },
{ ints => [ 5, 3, 2, 4, 2, 1 ], k => 4 },
);
for my $example (@examples) {
my @output = target_index($example);
my $output = join ', ', @output;
my $ints = join ', ', $example->{ints}->@*;
my $k = $example->{k};
say <<"END";
Input: \@ints = ($ints), \$k = $k
Output: ($output)
END
}
sub target_index ($obj) {
my @sorted = sort { $a <=> $b } $obj->{ints}->@*;
my $k = $obj->{k};
my @output = grep { $k == $sorted[$_] } 0 .. $#sorted;
return @output;
}
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