Advent of code 2018/3

Ajax Direct

// ==================================================
// > PART 1
// ==================================================
$grid = [];

foreach ($input->lines as $claim) {
    [$id, $x, $y, $w, $h] = $claim->numbers();
    for ($dx = 0; $dx < $w; $dx++) {
        for ($dy = 0; $dy < $h; $dy++) {
            $grid[($x + $dx).";".($y + $dy)] ??= 0;
            $grid[($x + $dx).";".($y + $dy)]++;
        }
    }
}

$solution_1 = count(array_filter($grid, fn ($n) => $n > 1));

// ==================================================
// > PART 2
// ==================================================
foreach ($input->lines as $claim) {
    [$id, $x, $y, $w, $h] = $claim->numbers();
    $overlaped = false;

    for ($dx = 0; $dx < $w; $dx++) {
        for ($dy = 0; $dy < $h; $dy++) {
            if ($grid[($x + $dx).";".($y + $dy)] > 1) {
                $overlaped = true;
                break 2;
            }
        }
    }

    if (!$overlaped) break;
}

$solution_2 = $id;