0) { $step = UtilIO::getIntArray(); foreach($pieces as $piece) { $piece->moveIfPossible(...$step); } $n--; } $ans = array_reduce(array_map(fn(piece $e):bool => $e->hasArrivedTarget(), $pieces), fn(bool $c, bool $i):bool => $c && $i, true); UtilIO::echoYNCapital($ans); class piece { private int $x; private int $y; private int $targetX; private int $targetY; public function __construct(int $x, int $y, int $targetX, int $targetY) { $this->x = $x; $this->y = $y; $this->targetX = $targetX; $this->targetY = $targetY; } public function moveIfPossible(int $currentX, int $currentY, int $nextX, int $nextY):void { if(!$this->existsAt($currentX, $currentY)) return; $this->x = $nextX; $this->y = $nextY; } private function existsAt(int $x, int $y):bool { return $this->x === $x && $this->y === $y; } public function hasArrivedTarget():bool { return $this->x === $this->targetX && $this->y === $this->targetY; } } class UtilIO { protected const YES = "YES"; protected const NO = "NO"; protected function __construct() { } public static function getString():string { return trim(fgets(STDIN)); } public static function getInt():int { return intval(static::getString()); } public static function getStringArray($separator = " "):array { return explode($separator, static::getString()); } public static function getIntArray($separator = " "):array { return array_map('intval', static::getStringArray($separator)); } public static function echoYNCapital(bool $b) { static::echo($b ? UtilIO::YES : UtilIO::NO); } public static function echoYNPascal(bool $b) { static::echo($b ? ucwords(strtolower(UtilIO::YES)) : ucwords(strtolower(UtilIO::NO))); } public static function echoYNLower(bool $b) { static::echo($b ? strtolower(UtilIO::YES) : strtolower(UtilIO::NO)); } public static function echo(mixed $value):void { if(is_string($value)) { echo static::toLine($value); return; } if(is_numeric($value)) { echo static::toLine(strval($value)); return; } if(is_array($value)) { foreach($value as $v) { static::echo($v); } return; } var_export($value); } public static function toLine(string $str):string { return trim($str).PHP_EOL; } }