fx

limingzhong · limingzhong · commit eb3002d6e00f · 2020-10-26T18:29:47.000+08:00
diff --git a/data_structure/binary_tree.md b/data_structure/binary_tree.md
@@ -2,6 +2,9 @@
 
 ## 知识点
 
+[二叉树](https://labuladong.gitbook.io/algo/shu-ju-jie-gou-xi-lie/er-cha-shu-xi-lie-1)
+
+
 ### 二叉树遍历
 
 **前序遍历**：**先访问根节点**，再前序遍历左子树，再前序遍历右子树
