18 lines
492 B
PHP
18 lines
492 B
PHP
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<?php
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$elves = explode("\n", file_get_contents('./input.txt'));
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echo count(
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array_filter(
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$elves,
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static function($elf) {
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[$section1, $section2] = array_map(static fn($section) => explode('-', $section), explode(',', $elf));
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return
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($section2[0] >= $section1[0] && $section2[1] <= $section1[1])
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($section1[0] >= $section2[0] && $section1[1] <= $section2[1])
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;
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}
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)
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);
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