Commit 023f19e

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Add solution 99.

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	`1`	`+/**`
	`2`	`+ * Definition for a binary tree node.`
	`3`	`+ * class TreeNode {`
	`4`	`+ * public $val = null;`
	`5`	`+ * public $left = null;`
	`6`	`+ * public $right = null;`
	`7`	`+ * function __construct($value) { $this->val = $value; }`
	`8`	`+ * }`
	`9`	`+ */`
	`10`	`+class Solution {`
	`11`	`+`
	`12`	`+ /**`
	`13`	`+ * @param TreeNode $root`
	`14`	`+ * @return NULL`
	`15`	`+ */`
	`16`	`+ function recoverTree($root) {`
	`17`	`+ $stack = [];`
	`18`	`+ $current = $root; $prev = null; $first = null; $second = null;`
	`19`	`+ while ($current != null \|\| count($stack) != 0) {`
	`20`	`+ while ($current != null) {`
	`21`	`+ array_push($stack, $current);`
	`22`	`+ $current = $current->left;`
	`23`	`+ }`
	`24`	`+ $current = array_pop($stack);`
	`25`	`+ if ($prev != null && $current->val < $prev->val) {`
	`26`	`+ if ($first == null) $first = $prev;`
	`27`	`+ $second = $current;`
	`28`	`+ }`
	`29`	`+ $prev = $current; $current = $current->right;`
	`30`	`+ }`
	`31`	`+ // swap`
	`32`	`+ $temp = $first->val; $first->val = $second->val; $second->val = $temp;`
	`33`	`+ }`
	`34`	`+}`

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