diff --git a/.obsidian/app.json b/.obsidian/app.json
index bec1234..c4d1020 100644
--- a/.obsidian/app.json
+++ b/.obsidian/app.json
@@ -1,7 +1,7 @@
 {
   "promptDelete": false,
   "newLinkFormat": "relative",
-  "attachmentFolderPath": "./assets/未命名",
+  "attachmentFolderPath": "./assets/代码随想录",
   "showUnsupportedFiles": false,
   "newFileLocation": "current",
   "useMarkdownLinks": true,
diff --git a/.obsidian/workspace.json b/.obsidian/workspace.json
index 6bb8686..bba28be 100644
--- a/.obsidian/workspace.json
+++ b/.obsidian/workspace.json
@@ -15,7 +15,7 @@
               "state": {
                 "file": "Books/代码随想录/代码随想录.md",
                 "mode": "source",
-                "source": false
+                "source": true
               }
             }
           }
@@ -103,6 +103,7 @@
             "state": {
               "type": "backlink",
               "state": {
+                "file": "Books/代码随想录/代码随想录.md",
                 "collapseAll": false,
                 "extraContext": false,
                 "sortOrder": "alphabetical",
@@ -119,6 +120,7 @@
             "state": {
               "type": "outgoing-link",
               "state": {
+                "file": "Books/代码随想录/代码随想录.md",
                 "linksCollapsed": false,
                 "unlinkedCollapsed": true
               }
@@ -140,7 +142,9 @@
             "type": "leaf",
             "state": {
               "type": "outline",
-              "state": {}
+              "state": {
+                "file": "Books/代码随想录/代码随想录.md"
+              }
             }
           },
           {
@@ -169,10 +173,10 @@
       "oz-clear-unused-images:Clear Unused Images": false
     }
   },
-  "active": "37c3469d51811935",
+  "active": "cfd9802490841a0a",
   "lastOpenFiles": [
-    "Books/代码随想录/代码随想录.md",
     "Temp/未命名.md",
+    "Books/代码随想录/代码随想录.md",
     "Books/Vim实用技巧/一、入门导读.md",
     "Books/代码随想录/().md",
     "_notion-like-tables/table-id-ncD19n.md",
diff --git a/Books/代码随想录/代码随想录.md b/Books/代码随想录/代码随想录.md
index d6ec307..aeea753 100644
--- a/Books/代码随想录/代码随想录.md
+++ b/Books/代码随想录/代码随想录.md
@@ -50,10 +50,12 @@ tag: algorithm
 | 8    | 赎金信           | 完成 | 数组代替集合 | 适用于限定范围的key         |      |
 
 # 字符串
-| 序号 | 章节         | 进度 | 解题 | 注意 | 回顾 |
-| ---- | ------------ | ---- | ---- | ---- | ---- |
-| 1    | 反转字符串   | 完成 |      |      |      |
-| 2    | 反转字符串II |      |      |      |      |
+| 序号 | 章节         | 进度 | 解题   | 注意                           | 回顾 |
+| ---- | ------------ | ---- | ------ | ------------------------------ | ---- |
+| 1    | 反转字符串   | 完成 |        |                                |      |
+| 2    | 反转字符串II |      |        | 注意循环条件                   | √    |
+| 3    | 替换空格     |      | 双指针 | 从后向前操作避免每次都移动元素 | √    |
+| 4    |              |      |        |                                |      |
 
 # 双指针法