Look And Say序列,简单的说就是根据你看到的数字,写出下一个数字
比如:
第一个数字是:1。
看着第一个数字你可以说1个1,那么第二个数字就是:11。
看着第二个数字你可以说2个1,即第三个数字是:21。
看着第三个数字你可以说1个2,1个1,即第四个数字是:1211。
看着第四个数字你可以说1个1,1个2,2个1,即第五个数字是:111221。
…………
根据详细的说明可以参见:http://www.php.cn/
下面用PHP实现这个序列,如下:
代码如下:
function look($str) { $len = strlen($str); $count=0; $result=''; $temp=$str[0]; for($i=0;$i<$len;$i++) { if($temp!=$str[$i]) { $result.=$count.$temp; $temp = $str[$i]; $count=1; } else { $count++; } } $result.=$count.$temp; return $result; } $test_str = "1"; echo $test_str.'</br>'; for($i=0;$i<10;$i++) { $test_str=look($test_str); print $test_str."</br>"; }
注意look函数中的for循环,当$len-1时,$result并未累加最后一位数字的统计结果,所以在循环完成后再次累加一次。
最后输出结果:
1
11
21
1211
111221
312211
13112221
1113213211
31131211131221
13211311123113112211
11131221133112132113212221
作者:ywxgod

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