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#!/usr/bin/perl -s
use v5.16;
use Test2::V0;
our ($tests, $examples);
run_tests() if $tests || $examples; # does not return
die <<EOS unless @ARGV;
usage: $0 [-examples] [-tests] [--] [N...]
-examples
run the examples from the challenge
-tests
run some tests
N...
List of number to be searched for contiguous intervals.
EOS
### Input and Output
main: {
local $, = ', ';
local $" = ', ';
say map "[@$_]", range_list(@ARGV);
}
### Implementation
sub range_list {
# Collect contiguous intervals:
my @int = (['-inf']);
# If the current number is the successor of the current interval's
# last seen element, take it as the new interval endpoint. Start a
# new interval otherwise.
$_ == $int[-1][-1] + 1 ? $int[-1][1] = $_ : push @int, [$_] for @_;
# Discard point-only intervals.
grep @$_ > 1, @int;
}
### Examples and tests
sub run_tests {
SKIP: {
skip "examples" unless $examples;
is [range_list(1, 3, 4, 5, 7)], [[3, 5]], 'example 1';
is [range_list(1, 2, 3, 6, 7, 9)], [[1, 3], [6, 7]], 'example 2';
is [range_list(0, 1, 2, 4, 5, 6, 8, 9)], [[0, 2], [4, 6], [8, 9]],
'example 3';
}
SKIP: {
skip "tests" unless $tests;
is [range_list(0, 2, 4, 6, 8)], [], 'none';
}
done_testing;
exit;
}
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