Create Saul.md

Saul-Zhang · web-flow · commit f13af8cc94e8 · 2018-12-08T12:19:50.000+08:00
diff --git a/2018.12.07-leetcode104/Saul.md b/2018.12.07-leetcode104/Saul.md
@@ -0,0 +1,22 @@
+```java
+/**
+ * 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 leftLen = maxDepth(root.left);
+        int rightLen = maxDepth(root.right);
+        return Math.max(leftLen,rightLen)+1;
+        
+    }
+}
+```
