diff --git a/ex9/BST.hpp b/ex9/BST.hpp
index 53f25e2..757a59f 100644
--- a/ex9/BST.hpp
+++ b/ex9/BST.hpp
@@ -1,8 +1,9 @@
 #include "bintree.hpp"
 #include "stack.hpp"
-#include <time.h>
 #include <iostream>
 #include <string>
+#include <time.h>
+#include <cmath>
 
 class BST : binTree<int>
 {
@@ -10,6 +11,10 @@ private:
     binNodeArray(int) p;
 
 public:
+    ~BST()
+    {
+
+    }
     BST(int num)
     {
         srand(time(NULL));
@@ -70,23 +75,7 @@ public:
             }
         }
     }
-    void trav_level()
-    {
-        Queue<binNodeArray(int)> q;
-        q.enqueue(root());
-        while (!q.empty())
-        {
 
-            binNodeArray(int) node = q.dequeue();
-            std::cout << node->pos;
-            printf("-%02d:%02d \n", node->data / 60, node->data % 60);
-
-            if (hasLC(node))
-                q.enqueue(node->lc);
-            if (hasRC(node))
-                q.enqueue(node->rc);
-        }
-    }
     bool searchPath(binNodeArray(int) root, binNodeArray(int) target, Stack<binNodeArray(int)> *s)
     {
         if (root == NULL)
@@ -107,4 +96,133 @@ public:
             s->pop();
         return flag;
     }
+
+    //层次遍历
+    void trav_level()
+    {
+        Queue<binNodeArray(int)> q;
+        int depth = 0;
+        int old_depth = 0;
+        q.enqueue(root());
+        while (!q.empty())
+        {
+            binNodeArray(int) node = q.dequeue();
+
+            old_depth = depth;
+            depth = node->pos.size();
+            if (old_depth != depth)
+                printf("\n");
+
+            // std::cout << node->pos;
+            printf("%02d:%02d   ", node->data / 60, node->data % 60);
+
+            if (hasLC(node))
+                q.enqueue(node->lc);
+            if (hasRC(node))
+                q.enqueue(node->rc);
+        }
+    }
+
+    void search_best(int target)
+    {
+        Queue<binNodeArray(int)> q;
+
+        int minus = 1440;
+        binNodeArray(int) target_p;
+        q.enqueue(root());
+        while (!q.empty())
+        {
+            binNodeArray(int) node = q.dequeue();
+
+            
+            if(minus>abs(target-node->data))
+            {
+                minus = abs(target - node->data);
+                target_p = node;
+            }
+
+            if (hasLC(node))
+                q.enqueue(node->lc);
+            if (hasRC(node))
+                q.enqueue(node->rc);
+        }
+        std::cout << target_p->pos;
+        printf("-%02d:%02d \n", target_p->data / 60, target_p->data % 60);
+    }
+
+    //先序遍历
+    void trav_pre()
+    {
+        pre(root());
+    }
+
+    //后序遍历
+    void trav_post()
+    {
+        post(root());
+    }
+
+    //中序遍历
+    void trav_in()
+    {
+        in(root());
+    }
+
+protected:
+    void pre(binNodeArray(int) node)
+    {
+        if (!node)
+            return;
+
+        std::cout << node->pos;
+        printf("-%02d:%02d \n", node->data / 60, node->data % 60);
+
+        pre(node->lc);
+        pre(node->rc);
+    }
+
+    void post(binNodeArray(int) node)
+    {
+        if (!node)
+            return;
+
+        pre(node->lc);
+        pre(node->rc);
+
+        std::cout << node->pos;
+        printf("-%02d:%02d \n", node->data / 60, node->data % 60);
+    }
+
+    void in(binNodeArray(int) node)
+    {
+        if (!node)
+            return;
+
+        pre(node->lc);
+
+        std::cout << node->pos;
+        printf("-%02d:%02d \n", node->data / 60, node->data % 60);
+        pre(node->rc);
+    }
+
+public:
+    int height()
+    {
+        Queue<binNodeArray(int)> q;
+        q.enqueue(root());
+        int depth;
+        while (!q.empty())
+        {
+            binNodeArray(int) node = q.dequeue();
+
+            depth = node->pos.size();
+
+            if (hasLC(node))
+                q.enqueue(node->lc);
+            if (hasRC(node))
+                q.enqueue(node->rc);
+        }
+
+        return depth;
+    }
 };
\ No newline at end of file
diff --git a/ex9/ex9.cpp b/ex9/ex9.cpp
index c18608f..5d5fa74 100644
--- a/ex9/ex9.cpp
+++ b/ex9/ex9.cpp
@@ -5,8 +5,20 @@ int main()
 {
     printf("初始化\n");
     BST bst(31);
-    printf("层次遍历\n");
+
+    printf("========层次遍历========\n");
     bst.trav_level();
 
+    printf("\n========先序遍历========\n");
+    bst.trav_pre();
+
+    printf("========中序遍历========\n");
+    bst.trav_in();
+
+    printf("========后序遍历========\n");
+    bst.trav_post();
+
+    printf("高度为%d\n",bst.height());
+
     return 0;
 }
\ No newline at end of file