diff --git a/SDUTOJ/1489_li_jun_09_05.cpp b/SDUTOJ/1489_li_jun_09_05.cpp
new file mode 100644
index 0000000..c7fb956
--- /dev/null
+++ b/SDUTOJ/1489_li_jun_09_05.cpp
@@ -0,0 +1,53 @@
+#include <iostream>
+#include <cstring>
+#define MAX 50+3
+using namespace std;
+typedef char Elem_Type;
+typedef struct BiTree
+{
+	Elem_Type data;//数据
+	struct BiTree *Lchild;//左孩子
+	struct BiTree *Rchild;//右孩子
+}BiTree;	  //要查找的元素  查找的地方	数组的长度
+int Search_Num(Elem_Type num,Elem_Type *array,int len)
+{
+	for(int i=0; i<len; i++)
+	   if(array[i] == num)
+		 return i;
+	//return -1;//没有找到
+}						   //中序遍历	后序遍历	 中序长度
+BiTree *Resume_BiTree(Elem_Type *center,Elem_Type *back,int len)
+{
+	if(len <= 0)
+	  return NULL;
+	BiTree *temp = new BiTree;
+	temp->data = *back;
+	int index = Search_Num(*back,center,len);
+	temp->Rchild = Resume_BiTree(center+index+1,back-1,len-index-1);
+	temp->Lchild = Resume_BiTree(center,back-len+index,index);
+	return temp;
+}
+void PreOrderTraverse(BiTree *root)//前序遍历
+{
+	if( root != NULL)
+	{
+		cout<<root->data;
+		PreOrderTraverse(root->Lchild);
+		PreOrderTraverse(root->Rchild);
+	}
+}
+int main(void)
+{
+	Elem_Type *inorder  = new Elem_Type [MAX];//中序
+	Elem_Type *postorde = new Elem_Type [MAX];//后序
+	int t;cin>>t;
+	while(t--)
+	{
+		cin>>inorder;cin>>postorde;
+		BiTree *root =
+		Resume_BiTree(inorder,postorde+strlen(postorde)-1,strlen(inorder));
+		PreOrderTraverse(root);
+		cout<<endl;
+	}
+	return 0;
+}