Merge pull request gzc426#384 from heyheyheyi/master

gzc426 · web-flow · commit 9a8168d5dba7 · 2018-12-08T11:40:14.000+08:00
12.7 leetcode 104
diff --git a/2018.12.07-leetcode104/棕榈树.md b/2018.12.07-leetcode104/棕榈树.md
@@ -0,0 +1,21 @@
+```
+/**
+ * Definition for a binary tree node.
+ * public class TreeNode {
+ *     int val;
+ *     TreeNode left;
+ *     TreeNode right;
+ *     TreeNode(int x) { val = x; }
+ * }
+ */
+class Solution {
+    public int maxDepth(TreeNode root) {
+        if(root==null){
+            return 0;
+        }
+        int left = maxDepth(root.left);
+        int right = maxDepth(root.right);
+        return Math.max(left,right)+1;
+    }
+}
+```
