27 lines
641 B
PHP
27 lines
641 B
PHP
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<?php
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$input = explode(',', file_get_contents('input.txt'));
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// don't forget : 12 @ position 1 && 2 @ position 2
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$i = 0;
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while($input[$i] !== 99) {
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[$operation, $first, $second, $position] = array_slice($input, $i, 4);
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switch ($operation) {
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case 1:
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$input[$position] = $input[$first] + $input[$second];
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break;
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case 2:
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$input[$position] = $input[$first] * $input[$second];
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break;
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case 99:
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echo $input[0];
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exit;
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default:
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echo 'unknown operation : '.$operation;
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exit;
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}
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$i += 4;
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}
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echo $input[0];
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