Simple 5 lines solution Java


  • 4
    A
    /**
     * Definition for a binary tree node.
     * public class TreeNode {
     *     int val;
     *     TreeNode left;
     *     TreeNode right;
     *     TreeNode(int x) { val = x; }
     * }
     */
    public class Solution {
        public int maxDepth(TreeNode root) {
            if (root == null){
                return 0;
            }
            return Math.max(maxDepth(root.left), maxDepth(root.right)) + 1;
        }
    }

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