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utils.php
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utils.php
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<?php
function permutations(array $input): Generator {
if (count($input) === 1) {
yield current($input);
return;
}
foreach ($input as $key => $value) {
$copy = $input;
unset($copy[$key]);
foreach (permutations($copy) as $subCombination) {
yield $value . $subCombination;
}
}
}
class IntCodeParser
{
private $program = [];
private $input = [];
private $pos = 0;
private $relPos = 0;
public function __construct(array $program, ...$input)
{
$this->program = $program;
array_push($this->input, ...$input);
}
public function input(int $input)
{
$this->input[] = $input;
}
public function output() {
$prg = &$this->program;
$numArgs = [1 => 3, 2 => 3, 3 => 1, 4 => 1, 5 => 2, 6 => 2, 7 => 3, 8 => 3, 9 => 1, 99 => 0];
$posArgs = [1 => 3, 2 => 3, 3 => 1, 4 => -1, 5 => -1, 6 => -1, 7 => 3, 8 => 3, 9 => -1];
$wantInput = false;
while (true) {
$a = str_pad((string) $prg[$this->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++) {
$value = (int) $prg[$this->pos + $i];
if ($posArgs[$opcode] === $i) {
$arg[$i] = $mode[$i] === 2 ? $this->relPos + $value : $value;
} elseif ($mode[$i] === 0) {
$arg[$i] = (int) ($prg[$value] ?? 0);
} elseif ($mode[$i] === 1) {
$arg[$i] = $value;
} else {
$arg[$i] = (int) ($prg[$this->relPos + $value] ?? 0);
}
}
switch ($opcode) {
case 1:
$prg[$arg[3]] = (int) $arg[1] + (int) $arg[2];
break;
case 2:
$prg[$arg[3]] = (int) $arg[1] * (int) $arg[2];
break;
case 3:
if ($wantInput) {
return null;
}
if (empty($this->input)) {
$prg[$arg[1]] = -1;
$wantInput = true;
break;
}
$prg[$arg[1]] = array_shift($this->input);
break;
case 4:
$this->pos += $numArgs[$opcode] + 1;
return (int) $arg[1];
case 5:
if ($arg[1] !== 0) {
$this->pos = $arg[2] - ($numArgs[$opcode] + 1);
break;
}
break;
case 6:
if ($arg[1] === 0) {
$this->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 9:
$this->relPos += $arg[1];
break;
case 99:
return null;
}
$this->pos += $numArgs[$opcode] + 1;
}
}
}