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#!/usr/bin/env perl
use strict;
use warnings;
use experimental qw{ say postderef signatures state };
use List::Util qw{ max };
my @examples = (
[ 10, 8, 5, 4, 3 ],
[ 25, 8, 5, 3, 3 ],
);
for my $e (@examples) {
my $o = h_index( $e->@* );
my $array = join ', ', $e->@*;
say <<"END";
Input: \@array = $array
Output: $o
END
}
sub h_index ( @citations ) {
my $max = max @citations;
for my $h ( 1 .. $max ) {
my $i = () = grep { $_ >= $h } @citations;
return $h - 1 if $i < $h;
}
return 0;
}
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