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#!/usr/bin/perl
=begin comment
Task #2 > Conflict Intervals
============================
You are given a list of intervals.
Write a script to find out if the current interval conflicts with any of the
previous intervals.
EXAMPLE
Input: @intervals = ( [1, 4], [3, 5], [6, 8], [12, 13], [3, 20] );
Output: ( [3, 5], [3, 20] )
- The 1st interval [1, 4] does not have any previous intervals to compare
with, so skip it.
- The 2nd interval [3, 5] does conflict with previous interval [1, 4].
- The 3rd interval [6, 8] does not conflict with any of the previous
intervals [1, 4] and [3, 5], so skip it.
- The 4th interval [12, 13] again does not conflict with any previous
intervals [1, 4], [3, 5], or [6, 8] so skip it.
- The 5th interval [3, 20] conflicts with the first interval [1, 4].
Input: @intervals = ( [3, 4], [5, 7], [6, 9], [10, 12], [13, 15] );
Output: ( [6, 9] );
=end comment
=cut
use strict;
use warnings;
use utf8;
use open ":std", ":encoding(UTF-8)";
use Term::ANSIColor;
use Scalar::Util qw( reftype );
use JSON qw( decode_json );
# Here, our subroutine to test our intervals (PWC solution)
sub find_conflict_intervals {
my $set_ref = shift @_;
my @conflicts = ();
my @passed = ();
if (reftype $set_ref ne "ARRAY") {
print "Array reference not found\n";
return 0;
}
foreach my $set (@$set_ref) {
my ($a1, $a2) = sort { $a <=> $b } @$set;
my $conflict = grep {
my ($b1, $b2) = sort { $a <=> $b } @$_;
($a1 >= $b1 && $a1 <= $b2) ||
($a2 >= $b1 && $a2 <= $b2) ||
($a1 <= $b1 && $a2 >= $b2);
} @passed;
push @passed, [$a1, $a2] if not $conflict;
push @conflicts, [$a1, $a2] if $conflict;
}
return \@conflicts;
}
# Followed by some utilities to test our solution
sub parse_test_case {
my $filename = shift;
open my $fh, "<", $filename
or die "Could not open '$filename' - $!\n";
read $fh, my $json, -s $fh;
close $fh;
my $data = decode_json $json;
return $data;
}
sub sort_compare {
return ($a->[0] <=> $b->[0]) || ($a->[1] <=> $b->[1]);
}
sub compare_interval_sets {
my ($output, $compare) = @_;
if (reftype $output ne "ARRAY" || reftype $compare ne "ARRAY") {
print "Output not formatted correctly\n";
return 0;
}
my $length = scalar @$output;
if ($length != scalar @$compare) {
return 0;
}
my @sorted_output = sort sort_compare @$output;
my @sorted_compare = sort sort_compare @$compare;
for my $i (0 .. $length) {
my $test = $sorted_output[0];
my $answer = $sorted_compare[0];
if ($test->[0] != $answer->[0] || $test->[1] != $answer->[1]) {
return 0;
}
}
return 1;
}
sub assert_conflicts {
my ($input, $output) = @_;
my $compare = find_conflict_intervals $input;
my $equal = compare_interval_sets $output, $compare;
print color("green"), "Passed \x{2690}\n", color("reset") if $equal;
print color("red"), "Failed \x{2715}\n", color("reset") if not $equal;
}
# And our test runner
sub main {
my $target = shift @ARGV // "../test_cases/ch2";
if (-e -r -f $target) {
my $json = parse_test_case $target;
my $input = %$json{"input"};
my $output = %$json{"output"};
print $target, ": ";
assert_conflicts $input, $output;
return;
} elsif (-e -r -d _) {
$target =~ s/^(.*?)\/?$/$1\//; # check for trailing slash
opendir my $dh, $target
or die "Could not open '$target' - $!\n";
my @entries = readdir $dh;
foreach my $entry (@entries) {
if ($entry eq "." or $entry eq "..") {
next;
}
my $path = $target . $entry;
my $json = parse_test_case $path;
my $input = %$json{"input"};
my $output = %$json{"output"};
print $path, ": ";
assert_conflicts $input, $output;
}
closedir $dh;
return;
} else {
print "No test files found\n";
}
}
main();
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