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完美洗牌算法

Jun 06, 2016 pm 07:33 PM
Perfectaveragealgorithm

完美洗牌就是将一副牌平均分成两份(26张)来交错洗牌,如此循环反复一定次数后,又变回洗牌前的顺序了。 即:a_1,a_2........a_n,b_1,b_2.........b_n的序列变为b_1,a_1,b_2,a_2.......b_n,a_n 我知道这代码很SHI,只是抛砖,向各位高人请教更好的算法,谢谢

完美洗牌就是将一副牌平均分成两份(26张)来交错洗牌,如此循环反复一定次数后,又变回洗牌前的顺序了。
即:a_1,a_2........a_n,b_1,b_2.........b_n的序列变为 b_1,a_1,b_2,a_2.......b_n,a_n 

我知道这代码很SHI,只是抛砖,向各位高人请教更好的算法,谢谢!
 
	//完美洗牌
        //$time为洗牌次数
	function pshuffle($time = 8){
		$num = 52;
		$res = $data = range(1,$num);
		for($j=0;$j<$time;$j++){
			if($newdata) $data = $newdata;
			
			for($i=0;$i<sizeof($data);$i++){
				if($i<$num/2){
					$newdata[$i*2] = $data[$i];
				}else{
					$key = $i * 2 - $num + 1;
					$newdata[$key] = $data[$i];
				}
			}
			//返回次数
			// if($newdata == $res){
				// return $j+1;
				// break;
			// }
		}
		ksort($newdata);
		return $newdata;
	}
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