diff --git a/problems/0104.二叉树的最大深度.md b/problems/0104.二叉树的最大深度.md
index b95e39c8..36578fd3 100644
--- a/problems/0104.二叉树的最大深度.md
+++ b/problems/0104.二叉树的最大深度.md
@@ -50,7 +50,7 @@
 
 代码如下：
 ```CPP
-int getdepth(treenode* node)
+int getdepth(TreeNode* node)
 ```
 
 2. 确定终止条件：如果为空节点的话，就返回0，表示高度为0。
@@ -76,14 +76,14 @@ return depth;
 ```CPP
 class solution {
 public:
-    int getdepth(treenode* node) {
+    int getdepth(TreeNode* node) {
         if (node == NULL) return 0;
         int leftdepth = getdepth(node->left);       // 左
         int rightdepth = getdepth(node->right);     // 右
         int depth = 1 + max(leftdepth, rightdepth); // 中
         return depth;
     }
-    int maxdepth(treenode* root) {
+    int maxDepth(TreeNode* root) {
         return getdepth(root);
     }
 };
@@ -93,9 +93,9 @@ public:
 ```CPP
 class solution {
 public:
-    int maxdepth(treenode* root) {
+    int maxDepth(TreeNode* root) {
         if (root == null) return 0;
-        return 1 + max(maxdepth(root->left), maxdepth(root->right));
+        return 1 + max(maxDepth(root->left), maxDepth(root->right));
     }
 };
 
@@ -110,7 +110,7 @@ public:
 class solution {
 public:
     int result;
-    void getdepth(treenode* node, int depth) {
+    void getdepth(TreeNode* node, int depth) {
         result = depth > result ? depth : result; // 中
 
         if (node->left == NULL && node->right == NULL) return ;
@@ -127,7 +127,7 @@ public:
         }
         return ;
     }
-    int maxdepth(treenode* root) {
+    int maxDepth(TreeNode* root) {
         result = 0;
         if (root == NULL) return result;
         getdepth(root, 1);
@@ -144,7 +144,7 @@ public:
 class solution {
 public:
     int result;
-    void getdepth(treenode* node, int depth) {
+    void getdepth(TreeNode* node, int depth) {
         result = depth > result ? depth : result; // 中
         if (node->left == NULL && node->right == NULL) return ;
         if (node->left) { // 左
@@ -155,7 +155,7 @@ public:
         }
         return ;
     }
-    int maxdepth(treenode* root) {
+    int maxDepth(TreeNode* root) {
         result = 0;
         if (root == 0) return result;
         getdepth(root, 1);
@@ -182,16 +182,16 @@ c++代码如下：
 ```CPP
 class solution {
 public:
-    int maxdepth(treenode* root) {
+    int maxDepth(TreeNode* root) {
         if (root == NULL) return 0;
         int depth = 0;
-        queue<treenode*> que;
+        queue<TreeNode*> que;
         que.push(root);
         while(!que.empty()) {
             int size = que.size();
             depth++; // 记录深度
             for (int i = 0; i < size; i++) {
-                treenode* node = que.front();
+                TreeNode* node = que.front();
                 que.pop();
                 if (node->left) que.push(node->left);
                 if (node->right) que.push(node->right);
@@ -230,11 +230,11 @@ c++代码：
 ```CPP
 class solution {
 public:
-    int maxdepth(node* root) {
+    int maxDepth(Node* root) {
         if (root == 0) return 0;
         int depth = 0;
         for (int i = 0; i < root->children.size(); i++) {
-            depth = max (depth, maxdepth(root->children[i]));
+            depth = max (depth, maxDepth(root->children[i]));
         }
         return depth + 1;
     }
@@ -247,15 +247,15 @@ public:
 ```CPP
 class solution {
 public:
-    int maxdepth(node* root) {
-        queue<node*> que;
+    int maxDepth(Node* root) {
+        queue<Node*> que;
         if (root != NULL) que.push(root);
         int depth = 0;
         while (!que.empty()) {
             int size = que.size();
             depth++; // 记录深度
             for (int i = 0; i < size; i++) {
-                node* node = que.front();
+                Node* node = que.front();
                 que.pop();
                 for (int j = 0; j < node->children.size(); j++) {
                     if (node->children[j]) que.push(node->children[j]);