diff --git a/docs/notes/剑指 Offer 题解 - 50~59.md b/docs/notes/剑指 Offer 题解 - 50~59.md
index cdf848fe..6b371da4 100644
--- a/docs/notes/剑指 Offer 题解 - 50~59.md
+++ b/docs/notes/剑指 Offer 题解 - 50~59.md
@@ -140,7 +140,7 @@ private void merge(int[] nums, int l, int m, int h) {
## 题目描述
-<div align="center"> <img src="https://gitee.com/CyC2018/CS-Notes/raw/master/docs/pics/8f6f9dc9-9ecd-47c8-b50e-2814f0219056.png" width="500"/> </div><br>
+<div align="center"> <img src="https://gitee.com/CyC2018/CS-Notes/raw/master/docs/pics/5f1cb999-cb9a-4f6c-a0af-d90377295ab8.png" width="500"/> </div><br>
## 解题思路
@@ -232,7 +232,7 @@ private void inOrder(TreeNode root, int k) {
从根结点到叶结点依次经过的结点（含根、叶结点）形成树的一条路径，最长路径的长度为树的深度。
-<div align="center"> <img src="https://gitee.com/CyC2018/CS-Notes/raw/master/docs/pics/b29f8971-9cb8-480d-b986-0e60c2ece069.png" width="350"/> </div><br>
+<div align="center"> <img src="https://gitee.com/CyC2018/CS-Notes/raw/master/docs/pics/ba355101-4a93-4c71-94fb-1da83639727b.jpg" width="350px"/> </div><br>
## 解题思路
@@ -250,7 +250,7 @@ public int TreeDepth(TreeNode root) {
平衡二叉树左右子树高度差不超过 1。
-<div align="center"> <img src="https://gitee.com/CyC2018/CS-Notes/raw/master/docs/pics/e026c24d-00fa-4e7c-97a8-95a98cdc383a.png" width="300"/> </div><br>
+<div align="center"> <img src="https://gitee.com/CyC2018/CS-Notes/raw/master/docs/pics/af1d1166-63af-47b6-9aa3-2bf2bd37bd03.jpg" width="250px"/> </div><br>
## 解题思路
diff --git a/docs/notes/剑指 Offer 题解 - 目录.md b/docs/notes/剑指 Offer 题解 - 目录.md
index 8fdf01aa..0efa7703 100644
--- a/docs/notes/剑指 Offer 题解 - 目录.md
+++ b/docs/notes/剑指 Offer 题解 - 目录.md
@@ -2,8 +2,6 @@
# 目录
-部分绘图文件可以在这里免费下载：[剑指 Offer](https://www.processon.com/view/5a3e4c7be4b0909c1aa18b49)，后续会慢慢把所有题目都配上 GIF 演示图。
-
- [3\~9](剑指%20Offer%20题解%20-%203\~9.md)
- [10\~19](剑指%20Offer%20题解%20-%2010\~19.md)
- [20\~29](剑指%20Offer%20题解%20-%2020\~29.md)
diff --git a/docs/notes/剑指 Offer 题解 - 目录1.md b/docs/notes/剑指 Offer 题解 - 目录1.md
index 798191a0..adcc2ce3 100644
--- a/docs/notes/剑指 Offer 题解 - 目录1.md
+++ b/docs/notes/剑指 Offer 题解 - 目录1.md
@@ -2,8 +2,6 @@
# 目录
-部分绘图文件可以在这里免费下载：[剑指 Offer](https://www.processon.com/view/5a3e4c7be4b0909c1aa18b49)，后续会慢慢把所有题目都配上 GIF 演示图。
-
- [3\~9](notes/剑指%20Offer%20题解%20-%203\~9.md)
- [10\~19](notes/剑指%20Offer%20题解%20-%2010\~19.md)
- [20\~29](notes/剑指%20Offer%20题解%20-%2020\~29.md)
diff --git a/docs/pics/5f1cb999-cb9a-4f6c-a0af-d90377295ab8.png b/docs/pics/5f1cb999-cb9a-4f6c-a0af-d90377295ab8.png
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