22 lines
570 B
PHP
22 lines
570 B
PHP
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<?php
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$positions = array_map('intval', explode(',', file_get_contents('./input.txt')));
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$min = min($positions);
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$max = max($positions);
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$lowest_fuel = $max * array_sum(range(1, $max));
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$best_position = 0;
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for ($i = $min; $i <= $max; $i++) {
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$fuel_used = 0;
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foreach ($positions as $position) {
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$fuel_used += array_sum(range(1, abs($position - $i)));
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}
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if ($lowest_fuel > $fuel_used) {
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$lowest_fuel = $fuel_used;
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$best_position = $i;
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}
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}
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echo sprintf('Best position is %u with %u fuel used.', $best_position, $lowest_fuel);
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