11 lines
271 B
PHP
11 lines
271 B
PHP
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<?php
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$numbers = array_map('intval', explode("\n", file_get_contents('input.txt')));
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foreach ($numbers as $number) {
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$number_to_2020 = 2020 - $number;
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if (in_array($number_to_2020, $numbers, true)) {
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echo $number_to_2020 * $number;
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exit;
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}
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}
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