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day-7-generators.php
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day-7-generators.php
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<?php
require_once __DIR__ . '/utils.php';
$input = trim(file_get_contents(__DIR__ . '/input/day-7'));
$input = explode(',', $input);
$start = microtime(true);
$part1 = 0;
foreach (permutations([0,1,2,3,4]) as $comb) {
$setting = str_split($comb);
$signal = 0;
for ($i = 0; $i < 5; $i++) {
$gen = amplify($input, $setting[$i]);
$gen->current();
$signal = $gen->send($signal);
}
if ($signal > $part1) $part1 = $signal;
}
$part2 = 0;
foreach (permutations([5,6,7,8,9]) as $comb) {
$phase = str_split($comb);
$i = 0;
$signal = 0;
$amps = [amplify($input, $phase[0]), amplify($input, $phase[1]), amplify($input, $phase[2]), amplify($input, $phase[3]), amplify($input, $phase[4])];
for ($i = 0; $i < 5; $i++) {
$amps[$i]->current();
$signal = $amps[$i]->send($signal);
}
while (true) {
for ($i = 0; $i < 5; $i++) {
$amps[$i]->next();
if (!$amps[$i]->valid()) {
if ($signal > $part2) $part2 = $signal;
break 2;
}
$signal = $amps[$i]->send($signal);
}
}
}
echo 'Part 1: ' . $part1 . PHP_EOL;
echo 'Part 2: ' . $part2 . PHP_EOL;
function amplify(array $prg, int $phase)
{
$input = [$phase];
$pos = 0;
$numArgs = [1 => 3, 2 => 3, 3 => 1, 4 => 1, 5 => 2, 6 => 2, 7 => 3, 8 => 3, 99 => 0];
$posArgs = [1 => 3, 2 => 3, 3 => 1, 4 => -1, 5 => -1, 6 => -1, 7 => 3, 8 => 3];
while (true) {
$a = str_pad((string) $prg[$pos], 5, '0', STR_PAD_LEFT);
$opcode = (int) ($a[3] . $a[4]);
$mode = [1 => (int) $a[2], 2 => (int) $a[1], 3 => (int) $a[0]];
$arg = [];
for ($i = 1; $i <= $numArgs[$opcode]; $i++) {
$arg[$i] = $mode[$i] || $posArgs[$opcode] === $i ? (int) $prg[$pos + $i] : (int) $prg[$prg[$pos + $i]];
}
switch ($opcode) {
case 1:
$prg[$arg[3]] = (int) $arg[1] + (int) $arg[2];
break;
case 2:
$prg[$arg[3]] = (int) $arg[1] * (int) $arg[2];
break;
case 3:
if (empty($input)) {
$prg[$arg[1]] = yield;
break;
}
$prg[$arg[1]] = array_shift($input);
break;
case 4:
yield $arg[1];
break;
case 5:
if ($arg[1] !== 0) {
$pos = $arg[2] - ($numArgs[$opcode] + 1);
break;
}
break;
case 6:
if ($arg[1] === 0) {
$pos = $arg[2] - ($numArgs[$opcode] + 1);
}
break;
case 7:
$prg[$arg[3]] = $arg[1] < $arg[2] ? 1 : 0;
break;
case 8:
$prg[$arg[3]] = $arg[1] === $arg[2] ? 1 : 0;
break;
case 99:
return;
}
$pos += $numArgs[$opcode] + 1;
}
}
echo 'Finished in ' . (microtime(true) - $start) . PHP_EOL;