32 lines
758 B
PHP
32 lines
758 B
PHP
<?php
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$players = explode("\n\n", file_get_contents('input.txt'));
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[$cards_1, $cards_2] = $players;
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$cards_1 = explode("\n", $cards_1);
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array_shift($cards_1);
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$cards_2 = explode("\n", $cards_2);
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array_shift($cards_2);
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while (!empty($cards_1) && !empty($cards_2)) {
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$card_1 = array_shift($cards_1);
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$card_2 = array_shift($cards_2);
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$cards = [$card_1, $card_2];
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rsort($cards);
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if ($card_1 > $card_2) {
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$cards_1 = array_merge($cards_1, $cards);
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} else {
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$cards_2 = array_merge($cards_2, $cards);
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}
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}
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$final_deck = empty($cards_1) ? $cards_2 : $cards_1;
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$final_deck = array_reverse($final_deck);
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$sum = 0;
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for ($i = 1, $l = count($final_deck); $i <= $l; $i++) {
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$sum += ($i * $final_deck[$i-1]);
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}
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echo $sum; |