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#!/usr/bin/perl
use v5.26;
use Test2::V0 qw(!float -no_srand);
use Test2::Tools::Subtest 'subtest_streamed';
use Getopt::Long;
use experimental 'signatures';
use PDL;
### Options and Arguments
my ($tests, $examples, $verbose);
GetOptions(
'examples!' => \$examples,
'tests!' => \$tests,
'verbose!' => \$verbose,
) or usage();
run_tests($examples, $tests); # tests do not return
usage() unless @ARGV;
sub usage {
die <<~EOS;
$0 - peak point
usage: $0 [-examples] [-tests] [--] [N...]
-examples
run the examples from the challenge
-tests
run some tests
N...
list of numbers
EOS
}
### Input and Output
say peak_point(@ARGV);
### Implementation
#
# For details see:
# https://github.sommrey.de/the-bears-den/2025/10/17/ch-339.html#task-2
sub peak_point {
max cumusumover pdl 0, @_;
}
### Examples and Tests
sub run_tests ($examples, $tests) {
return unless $examples || $tests;
state sub run_example ($args, $expected, $name) {
my $result = peak_point(@$args);
is $result, $expected,
"$name: (@$args) -> $expected";
}
plan 2;
$examples ? subtest_streamed(examples => sub {
my @examples = (
[[-5, 1, 5, -9, 2], 1, 'example 1'],
[[10, 10, 10, -25], 30, 'example 2'],
[[3, -4, 2, 5, -6, 1], 6, 'example 3'],
[[-1, -2, -3, -4], 0, 'example 4'],
[[-10, 15, 5], 10, 'example 5'],
);
plan scalar @examples;
for (@examples) {
run_example @$_;
}
}) : pass 'skip examples';
$tests ? subtest_streamed(tests => sub {
plan 1;
pass 'no tests';
}) : pass 'skip tests';
exit;
}
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