} else {
if ($direction == ">") {
$newPosition = array($position[0] + 1, $position[1]);
} else {
$newPosition = array($position[0] - 1, $position[1]);
}
}
}
// Save the position back to the relevent person
if ($robo) {
$roboPosition = $newPosition;
} else {
$santaPosition = $newPosition;
$robo = $robo + 1;
}
deliverPresent($newPosition);
}
}
echo $duplicateDeliveries;
function deliverPresent($position)
{
// 2007 throwback
// Should really be using a class
global $duplicateDeliveries, $houses;
$x = $position[0];
$y = $position[1];
if (!isset($houses[$x][$y])) {
// They haven't had a present before
$houses[$x][$y] = 1;
// We only care about the first duplicate delivery
return $duplicateDeliveries = $duplicateDeliveries + 1;
foreach (str_split($input) as $direction) {
if ($direction == "^") {
$newPosition = array($position[0], $position[1] + 1);
} else {
if ($direction == "v") {
$newPosition = array($position[0], $position[1] - 1);
} else {
if ($direction == ">") {
$newPosition = array($position[0] + 1, $position[1]);
} else {
$newPosition = array($position[0] - 1, $position[1]);
}
}
}
$position = $newPosition;
deliverPresent($position);
}
echo $duplicateDeliveries;
function deliverPresent($position)
{
// 2007 throwback
// Should really be using a class
global $duplicateDeliveries, $houses;
$x = $position[0];
$y = $position[1];
if (!isset($houses[$x][$y])) {
// They haven't had a present before
$houses[$x][$y] = 1;
// We only care about the first duplicate delivery
return $duplicateDeliveries = $duplicateDeliveries + 1;
}
