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#!/usr/bin/perl -s
use v5.24;
use Test2::V0;
use List::Util 'reduce';
our ($tests, $examples);
run_tests() if $tests || $examples; # does not return
die <<EOS unless @ARGV;
usage: $0 [-examples] [-tests] [I...]
-examples
run the examples from the challenge
-tests
run some tests
I...
list of items
EOS
### Input and Output
say max_freq(@ARGV);
### Implementation
#
# For details see:
# https://github.sommrey.de/the-bears-den/2024/07/05/ch-276.html#task-2
sub max_freq {
my ($maxfreq, %freq) = 0;
reduce {
&{ ( sub {$a + $maxfreq},
sub {$maxfreq = $freq{$b}},
sub {$a}
)[++$freq{$b} <=> $maxfreq]
}()
} 0, @_;
}
### Examples and tests
sub run_tests {
SKIP: {
skip "examples" unless $examples;
is max_freq(1, 2, 2, 4, 1, 5), 4, 'example 1';
is max_freq(1, 2, 3, 4, 5), 5, 'example 2';
}
SKIP: {
skip "tests" unless $tests;
is max_freq(qw(a b a b c d c d e f e f e c a)), 9, 'non-numbers'
}
done_testing;
exit;
}
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