Commit 2b9febe

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Add solution 143.

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	`1`	`+/**`
	`2`	`+ * Definition for a singly-linked list.`
	`3`	`+ * class ListNode {`
	`4`	`+ * public $val = 0;`
	`5`	`+ * public $next = null;`
	`6`	`+ * function __construct($val) { $this->val = $val; }`
	`7`	`+ * }`
	`8`	`+ */`
	`9`	`+class Solution {`
	`10`	`+`
	`11`	`+ /**`
	`12`	`+ * @param ListNode $head`
	`13`	`+ * @return NULL`
	`14`	`+ */`
	`15`	`+ function reorderList($head) {`
	`16`	`+ if($head == null) return;`
	`17`	`+ $slow = $head;`
	`18`	`+ $fast = $head;`
	`19`	`+`
	`20`	`+ while($fast != null && $fast->next != null){`
	`21`	`+ $fast = $fast->next->next;`
	`22`	`+ $slow = $slow->next;`
	`23`	`+ }`
	`24`	`+`
	`25`	`+ $next = null;`
	`26`	`+ $curr = $slow;`
	`27`	`+ $prev = null;`
	`28`	`+ while($curr != null){`
	`29`	`+ $next = $curr->next;`
	`30`	`+ $curr->next = $prev;`
	`31`	`+ $prev = $curr;`
	`32`	`+ $curr = $next;`
	`33`	`+ }`
	`34`	`+`
	`35`	`+ $temp;`
	`36`	`+ while($prev != null && $head->next != null){`
	`37`	`+ $temp = $head->next;`
	`38`	`+ $head->next = $prev;`
	`39`	`+ $head = $temp;`
	`40`	`+`
	`41`	`+ $temp = $prev->next;`
	`42`	`+ $prev->next = $head;`
	`43`	`+ $prev = $temp;`
	`44`	`+ }`
	`45`	`+ $head->next = null;`
	`46`	`+ }`
	`47`	`+}`

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