foreach ($this->input as $char) {
$this->step($char);
}
return count($this->visited);
}
public function step2($dir)
{
$xField = 'x' . $this->turn;
$yField = 'y' . $this->turn;
$this->{$xField} += $this->dir[$dir][0];
$this->{$yField} += $this->dir[$dir][1];
$key = $this->{$xField} . 'x' . $this->{$yField};
if (!isset($this->visited[$key])) {
$this->visited[$key] = 0;
}
$this->visited[$key]++;
}
public function part2()
{
$this->read();
$this->visited = ['0x0' => 2];
foreach ($this->input as $index => $char) {
$this->turn = $index % 2 === 0 ? 'Santa' : 'Robo';
$this->step2($char);
}
return count($this->visited);
}
}
$houses = new Houses();
echo "part1: " . $houses->countVisited() . "\n\n";
echo "part2: " . $houses->part2();
