更新README.md

Author: aQua

README.md

@@ -10,9 +10,9 @@
 
 |Category|Easy|Medium|Hard|Total|
 |:--|:--:|:--:|:--:|:--:|
-|**Algorithms**|45 / 145|80 / 250|29 / 93|154 / 488|
+|**Algorithms**|46 / 145|80 / 250|29 / 93|155 / 488|
 |**Draft**|0 / 1|0 / 3|0 / 0|0 / 4|
-|**Total**|45 / 146|80 / 253|29 / 93|154 / 492|
+|**Total**|46 / 146|80 / 253|29 / 93|155 / 492|
 
 ## 参考解答
 |题号|题目|难度|总体通过率|收藏|
@@ -120,6 +120,7 @@
 |101|[Symmetric Tree](./Algorithms/0101.symmetric-tree)|☆|38%|❤|
 |102|[Binary Tree Level Order Traversal](./Algorithms/0102.binary-tree-level-order-traversal)|☆ ☆|40%||
 |103|[Binary Tree Zigzag Level Order Traversal](./Algorithms/0103.binary-tree-zigzag-level-order-traversal)|☆ ☆|34%||
+|104|[Maximum Depth of Binary Tree](./Algorithms/0104.maximum-depth-of-binary-tree)|☆|52%||
 |105|[Construct Binary Tree from Preorder and Inorder Traversal](./Algorithms/0105.construct-binary-tree-from-preorder-and-inorder-traversal)|☆ ☆|32%|❤|
 |106|[Construct Binary Tree from Inorder and Postorder Traversal](./Algorithms/0106.construct-binary-tree-from-inorder-and-postorder-traversal)|☆ ☆|32%|❤|
 |118|[Pascal's Triangle](./Algorithms/0118.pascals-triangle)|☆|38%||