Method maxDepth

src/com/blankj/easy/_0104/Solution.java:15–18

(TreeNode root)

 */
public class Solution {
    public int maxDepth(TreeNode root) {
        if (root == null) return 0;
        return 1 + Math.max(maxDepth(root.left), maxDepth(root.right));
    }

    public static void main(String[] args) {
        Solution solution = new Solution();