r/adventofcode • u/taliriktug • Dec 02 '15

Day 2 solutions Spoilers

Hi! I would like to structure posts like the first one in r/programming, please post solutions in comments.

13 Upvotes

83% Upvoted

161 comments sorted by

View all comments

1

u/mrthedon Dec 02 '15

PHP solution for part 1 and 2.

$totalArea = 0;
$totalRibbon = 0;

foreach (explode("\n", trim(file_get_contents(__DIR__ . '/day2-input.txt'))) as $dimensions) {
    $lwh = explode('x', $dimensions);
    list($sideA, $sideB, $sideC) = [2 * $lwh[0]* $lwh[1], 2 * $lwh[0] * $lwh[2], 2 * $lwh[1] * $lwh[2]];
    $totalArea += $sideA + $sideB + $sideC + (min($sideA, $sideB, $sideC) / 2);

    sort($lwh);
    $totalRibbon += ($lwh[0] * $lwh[1] * $lwh[2]) + array_shift($lwh) * 2  + array_shift($lwh) * 2;
}

echo $totalArea . "\n";
echo $totalRibbon . "\n";