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222. Count Complete Tree Nodes

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	`1`	`+/**`
	`2`	`+ * Example:`
	`3`	`+ * var ti = TreeNode(5)`
	`4`	+ * var v = ti.`val`
	`5`	`+ * Definition for a binary tree node.`
	`6`	+ * class TreeNode(var `val`: Int) {
	`7`	`+ * var left: TreeNode? = null`
	`8`	`+ * var right: TreeNode? = null`
	`9`	`+ * }`
	`10`	`+ */`
	`11`	`+class Solution {`
	`12`	`+ fun countNodes(root: TreeNode?): Int {`
	`13`	`+ if(root == null) return 0`
	`14`	`+ val count = 1 + countNodes(root.left) + countNodes(root.right)`
	`15`	`+ return count`
	`16`	`+ }`
	`17`	`+}`

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