46 lines
1.1 KiB
PHP
46 lines
1.1 KiB
PHP
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<?php
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$input = explode(',', file_get_contents('input.txt'));
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function run_opcode(array $input)
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{
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$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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return $input[0];
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default:
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echo 'unknown operation : '.$operation;
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exit;
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}
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$i += 4;
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}
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return $input[0];
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}
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$noun = 0;
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$verb = 0;
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while ($verb !== 99) {
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$noun = 0;
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while ($noun !== 99) {
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$clone_input = $input;
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$clone_input[1] = $noun;
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$clone_input[2] = $verb;
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$magic_number = run_opcode($clone_input);
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if ($magic_number === 19690720) {
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echo sprintf('noun : %s | verb : %s', $noun, $verb);
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}
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$noun++;
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}
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$verb++;
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}
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echo sprintf("\n".'answer : %u', ((100*$noun)+$verb));
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