12 lines
239 B
PHP
12 lines
239 B
PHP
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<?php
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$groups = explode("\n\n", file_get_contents('input.txt'));
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$yesses = 0;
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foreach ($groups as $group) {
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$group_yes = implode('', explode("\n", $group));
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$yesses += count(array_unique(str_split($group_yes)));
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}
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echo $yesses;
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