diff --git a/codes/c/CMakeLists.txt b/codes/c/CMakeLists.txt
index 6128fceba..a1cc1d3c7 100644
--- a/codes/c/CMakeLists.txt
+++ b/codes/c/CMakeLists.txt
@@ -10,7 +10,6 @@ add_subdirectory(chapter_array_and_linkedlist)
 add_subdirectory(chapter_stack_and_queue)
 add_subdirectory(chapter_heap)
 add_subdirectory(chapter_hashing)
-add_subdirectory(chapter_binary_search)
 add_subdirectory(chapter_tree)
 add_subdirectory(chapter_searching)
 add_subdirectory(chapter_sorting)
\ No newline at end of file
diff --git a/codes/c/chapter_binary_search/CMakeLists.txt b/codes/c/chapter_binary_search/CMakeLists.txt
deleted file mode 100644
index 03d31e749..000000000
--- a/codes/c/chapter_binary_search/CMakeLists.txt
+++ /dev/null
@@ -1 +0,0 @@
-add_executable(binary_search binary_search.c)
\ No newline at end of file
diff --git a/codes/c/chapter_searching/CMakeLists.txt b/codes/c/chapter_searching/CMakeLists.txt
index 104f7a1d5..6cdf80622 100644
--- a/codes/c/chapter_searching/CMakeLists.txt
+++ b/codes/c/chapter_searching/CMakeLists.txt
@@ -1 +1,2 @@
+add_executable(binary_search binary_search.c)
 add_executable(two_sum two_sum.c)
\ No newline at end of file
diff --git a/codes/c/chapter_binary_search/binary_search.c b/codes/c/chapter_searching/binary_search.c
similarity index 100%
rename from codes/c/chapter_binary_search/binary_search.c
rename to codes/c/chapter_searching/binary_search.c
diff --git a/codes/cpp/CMakeLists.txt b/codes/cpp/CMakeLists.txt
index 164e94c81..9e3f5583a 100644
--- a/codes/cpp/CMakeLists.txt
+++ b/codes/cpp/CMakeLists.txt
@@ -8,7 +8,6 @@ include_directories(./include)
 add_subdirectory(chapter_computational_complexity)
 add_subdirectory(chapter_array_and_linkedlist)
 add_subdirectory(chapter_stack_and_queue)
-add_subdirectory(chapter_binary_search)
 add_subdirectory(chapter_hashing)
 add_subdirectory(chapter_tree)
 add_subdirectory(chapter_heap)
diff --git a/codes/cpp/chapter_binary_search/CMakeLists.txt b/codes/cpp/chapter_binary_search/CMakeLists.txt
deleted file mode 100644
index 304737e1f..000000000
--- a/codes/cpp/chapter_binary_search/CMakeLists.txt
+++ /dev/null
@@ -1 +0,0 @@
-add_executable(binary_search binary_search.cpp)
\ No newline at end of file
diff --git a/codes/cpp/chapter_searching/CMakeLists.txt b/codes/cpp/chapter_searching/CMakeLists.txt
index f003e3154..3b11b9fef 100644
--- a/codes/cpp/chapter_searching/CMakeLists.txt
+++ b/codes/cpp/chapter_searching/CMakeLists.txt
@@ -1,3 +1,5 @@
+add_executable(binary_search binary_search.cpp)
+add_executable(binary_search binary_search_edge.cpp)
 add_executable(hashing_search hashing_search.cpp)
 add_executable(two_sum two_sum.cpp)
 add_executable(linear_search linear_search.cpp)
\ No newline at end of file
diff --git a/codes/cpp/chapter_binary_search/binary_search.cpp b/codes/cpp/chapter_searching/binary_search.cpp
similarity index 100%
rename from codes/cpp/chapter_binary_search/binary_search.cpp
rename to codes/cpp/chapter_searching/binary_search.cpp
diff --git a/codes/cpp/chapter_binary_search/binary_search_edge.cpp b/codes/cpp/chapter_searching/binary_search_edge.cpp
similarity index 100%
rename from codes/cpp/chapter_binary_search/binary_search_edge.cpp
rename to codes/cpp/chapter_searching/binary_search_edge.cpp
diff --git a/codes/csharp/chapter_binary_search/binary_search.cs b/codes/csharp/chapter_searching/binary_search.cs
similarity index 98%
rename from codes/csharp/chapter_binary_search/binary_search.cs
rename to codes/csharp/chapter_searching/binary_search.cs
index ec80f29d3..25e87e73f 100644
--- a/codes/csharp/chapter_binary_search/binary_search.cs
+++ b/codes/csharp/chapter_searching/binary_search.cs
@@ -4,7 +4,7 @@
  * Author: haptear (haptear@hotmail.com)
  */
 
-namespace hello_algo.chapter_binary_search;
+namespace hello_algo.chapter_searching;
 
 public class binary_search {
     /* 二分查找（双闭区间） */
diff --git a/codes/dart/chapter_binary_search/binary_search.dart b/codes/dart/chapter_searching/binary_search.dart
similarity index 100%
rename from codes/dart/chapter_binary_search/binary_search.dart
rename to codes/dart/chapter_searching/binary_search.dart
diff --git a/codes/go/chapter_binary_search/binary_search.go b/codes/go/chapter_searching/binary_search.go
similarity index 97%
rename from codes/go/chapter_binary_search/binary_search.go
rename to codes/go/chapter_searching/binary_search.go
index 1f792c417..5754ef698 100644
--- a/codes/go/chapter_binary_search/binary_search.go
+++ b/codes/go/chapter_searching/binary_search.go
@@ -2,7 +2,7 @@
 // Created Time: 2022-12-05
 // Author: Slone123c (274325721@qq.com)
 
-package chapter_binary_search
+package chapter_searching
 
 /* 二分查找（双闭区间） */
 func binarySearch(nums []int, target int) int {
diff --git a/codes/go/chapter_binary_search/binary_search_test.go b/codes/go/chapter_searching/binary_search_test.go
similarity index 59%
rename from codes/go/chapter_binary_search/binary_search_test.go
rename to codes/go/chapter_searching/binary_search_test.go
index 0cfedbdcd..2618f9ec0 100644
--- a/codes/go/chapter_binary_search/binary_search_test.go
+++ b/codes/go/chapter_searching/binary_search_test.go
@@ -2,7 +2,7 @@
 // Created Time: 2022-12-05
 // Author: Slone123c (274325721@qq.com)
 
-package chapter_binary_search
+package chapter_searching
 
 import (
 	"fmt"
@@ -11,14 +11,14 @@ import (
 
 func TestBinarySearch(t *testing.T) {
 	var (
-		target   = 3
-		nums     = []int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
+		target   = 6
+		nums     = []int{1, 3, 6, 8, 12, 15, 23, 67, 70, 92}
 		expected = 2
 	)
 	// 在数组中执行二分查找
 	actual := binarySearch(nums, target)
-	fmt.Println("目标元素 3 的索引 =", actual)
+	fmt.Println("目标元素 6 的索引 =", actual)
 	if actual != expected {
-		t.Errorf("目标元素 3 的索引 = %d, 应该为 %d", actual, expected)
+		t.Errorf("目标元素 6 的索引 = %d, 应该为 %d", actual, expected)
 	}
 }
diff --git a/codes/java/chapter_binary_search/binary_search.java b/codes/java/chapter_searching/binary_search.java
similarity index 98%
rename from codes/java/chapter_binary_search/binary_search.java
rename to codes/java/chapter_searching/binary_search.java
index b2115e445..ba15359c6 100644
--- a/codes/java/chapter_binary_search/binary_search.java
+++ b/codes/java/chapter_searching/binary_search.java
@@ -4,7 +4,7 @@
  * Author: Krahets (krahets@163.com)
  */
 
-package chapter_binary_search;
+package chapter_searching;
 
 public class binary_search {
     /* 二分查找（双闭区间） */
diff --git a/codes/java/chapter_binary_search/binary_search_edge.java b/codes/java/chapter_searching/binary_search_edge.java
similarity index 98%
rename from codes/java/chapter_binary_search/binary_search_edge.java
rename to codes/java/chapter_searching/binary_search_edge.java
index d63a8f658..847a41e85 100644
--- a/codes/java/chapter_binary_search/binary_search_edge.java
+++ b/codes/java/chapter_searching/binary_search_edge.java
@@ -4,7 +4,7 @@
  * Author: Krahets (krahets@163.com)
  */
 
-package chapter_binary_search;
+package chapter_searching;
 
 public class binary_search_edge {
     /* 二分查找最左一个元素 */
diff --git a/codes/javascript/chapter_binary_search/binary_search.js b/codes/javascript/chapter_searching/binary_search.js
similarity index 100%
rename from codes/javascript/chapter_binary_search/binary_search.js
rename to codes/javascript/chapter_searching/binary_search.js
diff --git a/codes/python/chapter_binary_search/binary_search.py b/codes/python/chapter_searching/binary_search.py
similarity index 100%
rename from codes/python/chapter_binary_search/binary_search.py
rename to codes/python/chapter_searching/binary_search.py
diff --git a/codes/python/chapter_binary_search/binary_search_edge.py b/codes/python/chapter_searching/binary_search_edge.py
similarity index 100%
rename from codes/python/chapter_binary_search/binary_search_edge.py
rename to codes/python/chapter_searching/binary_search_edge.py
diff --git a/codes/rust/chapter_binary_search/binary_search.rs b/codes/rust/chapter_searching/binary_search.rs
similarity index 100%
rename from codes/rust/chapter_binary_search/binary_search.rs
rename to codes/rust/chapter_searching/binary_search.rs
diff --git a/codes/swift/Package.swift b/codes/swift/Package.swift
index 8d2716049..0ff7baec4 100644
--- a/codes/swift/Package.swift
+++ b/codes/swift/Package.swift
@@ -24,8 +24,6 @@ let package = Package(
         .executable(name: "deque", targets: ["deque"]),
         .executable(name: "linkedlist_deque", targets: ["linkedlist_deque"]),
         .executable(name: "array_deque", targets: ["array_deque"]),
-        // chapter_binary_search
-        .executable(name: "binary_search", targets: ["binary_search"]),
         // chapter_hashing
         .executable(name: "hash_map", targets: ["hash_map"]),
         .executable(name: "array_hash_map", targets: ["array_hash_map"]),
@@ -43,6 +41,7 @@ let package = Package(
         .executable(name: "graph_bfs", targets: ["graph_bfs"]),
         .executable(name: "graph_dfs", targets: ["graph_dfs"]),
         // chapter_searching
+        .executable(name: "binary_search", targets: ["binary_search"]),
         .executable(name: "two_sum", targets: ["two_sum"]),
         .executable(name: "linear_search", targets: ["linear_search"]),
         .executable(name: "hashing_search", targets: ["hashing_search"]),
@@ -86,8 +85,6 @@ let package = Package(
         .executableTarget(name: "deque", path: "chapter_stack_and_queue", sources: ["deque.swift"]),
         .executableTarget(name: "linkedlist_deque", path: "chapter_stack_and_queue", sources: ["linkedlist_deque.swift"]),
         .executableTarget(name: "array_deque", path: "chapter_stack_and_queue", sources: ["array_deque.swift"]),
-        // chapter_binary_search
-        .executableTarget(name: "binary_search", path: "chapter_binary_search", sources: ["binary_search.swift"]),
         // chapter_hashing
         .executableTarget(name: "hash_map", dependencies: ["utils"], path: "chapter_hashing", sources: ["hash_map.swift"]),
         .executableTarget(name: "array_hash_map", path: "chapter_hashing", sources: ["array_hash_map.swift"]),
@@ -105,6 +102,7 @@ let package = Package(
         .executableTarget(name: "graph_bfs", dependencies: ["utils", "graph_adjacency_list_target"], path: "chapter_graph", sources: ["graph_bfs.swift"]),
         .executableTarget(name: "graph_dfs", dependencies: ["utils", "graph_adjacency_list_target"], path: "chapter_graph", sources: ["graph_dfs.swift"]),
         // chapter_searching
+        .executableTarget(name: "binary_search", path: "chapter_searching", sources: ["binary_search.swift"]),
         .executableTarget(name: "two_sum", path: "chapter_searching", sources: ["two_sum.swift"]),
         .executableTarget(name: "linear_search", dependencies: ["utils"], path: "chapter_searching", sources: ["linear_search.swift"]),
         .executableTarget(name: "hashing_search", dependencies: ["utils"], path: "chapter_searching", sources: ["hashing_search.swift"]),
diff --git a/codes/swift/chapter_binary_search/binary_search.swift b/codes/swift/chapter_searching/binary_search.swift
similarity index 100%
rename from codes/swift/chapter_binary_search/binary_search.swift
rename to codes/swift/chapter_searching/binary_search.swift
diff --git a/codes/typescript/chapter_binary_search/binary_search.ts b/codes/typescript/chapter_searching/binary_search.ts
similarity index 100%
rename from codes/typescript/chapter_binary_search/binary_search.ts
rename to codes/typescript/chapter_searching/binary_search.ts
diff --git a/codes/zig/chapter_binary_search/binary_search.zig b/codes/zig/chapter_searching/binary_search.zig
similarity index 100%
rename from codes/zig/chapter_binary_search/binary_search.zig
rename to codes/zig/chapter_searching/binary_search.zig
diff --git a/docs/chapter_binary_search/binary_search.assets/binary_search_ranges.png b/docs/chapter_searching/binary_search.assets/binary_search_ranges.png
similarity index 100%
rename from docs/chapter_binary_search/binary_search.assets/binary_search_ranges.png
rename to docs/chapter_searching/binary_search.assets/binary_search_ranges.png
diff --git a/docs/chapter_binary_search/binary_search.assets/binary_search_step0.png b/docs/chapter_searching/binary_search.assets/binary_search_step0.png
similarity index 100%
rename from docs/chapter_binary_search/binary_search.assets/binary_search_step0.png
rename to docs/chapter_searching/binary_search.assets/binary_search_step0.png
diff --git a/docs/chapter_binary_search/binary_search.assets/binary_search_step1.png b/docs/chapter_searching/binary_search.assets/binary_search_step1.png
similarity index 100%
rename from docs/chapter_binary_search/binary_search.assets/binary_search_step1.png
rename to docs/chapter_searching/binary_search.assets/binary_search_step1.png
diff --git a/docs/chapter_binary_search/binary_search.assets/binary_search_step2.png b/docs/chapter_searching/binary_search.assets/binary_search_step2.png
similarity index 100%
rename from docs/chapter_binary_search/binary_search.assets/binary_search_step2.png
rename to docs/chapter_searching/binary_search.assets/binary_search_step2.png
diff --git a/docs/chapter_binary_search/binary_search.assets/binary_search_step3.png b/docs/chapter_searching/binary_search.assets/binary_search_step3.png
similarity index 100%
rename from docs/chapter_binary_search/binary_search.assets/binary_search_step3.png
rename to docs/chapter_searching/binary_search.assets/binary_search_step3.png
diff --git a/docs/chapter_binary_search/binary_search.assets/binary_search_step4.png b/docs/chapter_searching/binary_search.assets/binary_search_step4.png
similarity index 100%
rename from docs/chapter_binary_search/binary_search.assets/binary_search_step4.png
rename to docs/chapter_searching/binary_search.assets/binary_search_step4.png
diff --git a/docs/chapter_binary_search/binary_search.assets/binary_search_step5.png b/docs/chapter_searching/binary_search.assets/binary_search_step5.png
similarity index 100%
rename from docs/chapter_binary_search/binary_search.assets/binary_search_step5.png
rename to docs/chapter_searching/binary_search.assets/binary_search_step5.png
diff --git a/docs/chapter_binary_search/binary_search.assets/binary_search_step6.png b/docs/chapter_searching/binary_search.assets/binary_search_step6.png
similarity index 100%
rename from docs/chapter_binary_search/binary_search.assets/binary_search_step6.png
rename to docs/chapter_searching/binary_search.assets/binary_search_step6.png
diff --git a/docs/chapter_binary_search/binary_search.assets/binary_search_step7.png b/docs/chapter_searching/binary_search.assets/binary_search_step7.png
similarity index 100%
rename from docs/chapter_binary_search/binary_search.assets/binary_search_step7.png
rename to docs/chapter_searching/binary_search.assets/binary_search_step7.png
diff --git a/docs/chapter_binary_search/binary_search.md b/docs/chapter_searching/binary_search.md
similarity index 100%
rename from docs/chapter_binary_search/binary_search.md
rename to docs/chapter_searching/binary_search.md
diff --git a/docs/chapter_binary_search/binary_search_edge.assets/binary_search_left_edge_naive.png b/docs/chapter_searching/binary_search_edge.assets/binary_search_left_edge_naive.png
similarity index 100%
rename from docs/chapter_binary_search/binary_search_edge.assets/binary_search_left_edge_naive.png
rename to docs/chapter_searching/binary_search_edge.assets/binary_search_left_edge_naive.png
diff --git a/docs/chapter_binary_search/binary_search_edge.assets/binary_search_left_edge_step1.png b/docs/chapter_searching/binary_search_edge.assets/binary_search_left_edge_step1.png
similarity index 100%
rename from docs/chapter_binary_search/binary_search_edge.assets/binary_search_left_edge_step1.png
rename to docs/chapter_searching/binary_search_edge.assets/binary_search_left_edge_step1.png
diff --git a/docs/chapter_binary_search/binary_search_edge.assets/binary_search_left_edge_step2.png b/docs/chapter_searching/binary_search_edge.assets/binary_search_left_edge_step2.png
similarity index 100%
rename from docs/chapter_binary_search/binary_search_edge.assets/binary_search_left_edge_step2.png
rename to docs/chapter_searching/binary_search_edge.assets/binary_search_left_edge_step2.png
diff --git a/docs/chapter_binary_search/binary_search_edge.assets/binary_search_left_edge_step3.png b/docs/chapter_searching/binary_search_edge.assets/binary_search_left_edge_step3.png
similarity index 100%
rename from docs/chapter_binary_search/binary_search_edge.assets/binary_search_left_edge_step3.png
rename to docs/chapter_searching/binary_search_edge.assets/binary_search_left_edge_step3.png
diff --git a/docs/chapter_binary_search/binary_search_edge.assets/binary_search_left_edge_step4.png b/docs/chapter_searching/binary_search_edge.assets/binary_search_left_edge_step4.png
similarity index 100%
rename from docs/chapter_binary_search/binary_search_edge.assets/binary_search_left_edge_step4.png
rename to docs/chapter_searching/binary_search_edge.assets/binary_search_left_edge_step4.png
diff --git a/docs/chapter_binary_search/binary_search_edge.assets/binary_search_left_edge_step5.png b/docs/chapter_searching/binary_search_edge.assets/binary_search_left_edge_step5.png
similarity index 100%
rename from docs/chapter_binary_search/binary_search_edge.assets/binary_search_left_edge_step5.png
rename to docs/chapter_searching/binary_search_edge.assets/binary_search_left_edge_step5.png
diff --git a/docs/chapter_binary_search/binary_search_edge.assets/binary_search_left_edge_step6.png b/docs/chapter_searching/binary_search_edge.assets/binary_search_left_edge_step6.png
similarity index 100%
rename from docs/chapter_binary_search/binary_search_edge.assets/binary_search_left_edge_step6.png
rename to docs/chapter_searching/binary_search_edge.assets/binary_search_left_edge_step6.png
diff --git a/docs/chapter_binary_search/binary_search_edge.assets/binary_search_left_edge_step7.png b/docs/chapter_searching/binary_search_edge.assets/binary_search_left_edge_step7.png
similarity index 100%
rename from docs/chapter_binary_search/binary_search_edge.assets/binary_search_left_edge_step7.png
rename to docs/chapter_searching/binary_search_edge.assets/binary_search_left_edge_step7.png
diff --git a/docs/chapter_binary_search/binary_search_edge.assets/binary_search_left_edge_step8.png b/docs/chapter_searching/binary_search_edge.assets/binary_search_left_edge_step8.png
similarity index 100%
rename from docs/chapter_binary_search/binary_search_edge.assets/binary_search_left_edge_step8.png
rename to docs/chapter_searching/binary_search_edge.assets/binary_search_left_edge_step8.png
diff --git a/docs/chapter_binary_search/binary_search_edge.assets/binary_search_left_right_edge.png b/docs/chapter_searching/binary_search_edge.assets/binary_search_left_right_edge.png
similarity index 100%
rename from docs/chapter_binary_search/binary_search_edge.assets/binary_search_left_right_edge.png
rename to docs/chapter_searching/binary_search_edge.assets/binary_search_left_right_edge.png
diff --git a/docs/chapter_binary_search/binary_search_edge.md b/docs/chapter_searching/binary_search_edge.md
similarity index 100%
rename from docs/chapter_binary_search/binary_search_edge.md
rename to docs/chapter_searching/binary_search_edge.md
diff --git a/mkdocs.yml b/mkdocs.yml
index fcfc369de..d0fc50e9b 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -153,29 +153,32 @@ nav:
     - 5.2.   队列: chapter_stack_and_queue/queue.md
     - 5.3.   双向队列: chapter_stack_and_queue/deque.md
     - 5.4.   小结: chapter_stack_and_queue/summary.md
-  - 6.     二分查找:
-    - 6.1.   二分查找: chapter_binary_search/binary_search.md
-    - 6.2.   二分查找边界: chapter_binary_search/binary_search_edge.md 
-  - 7.     散列表:
-    - 7.1.   哈希表: chapter_hashing/hash_map.md
-    - 7.2.   哈希冲突处理: chapter_hashing/hash_collision.md
-    - 7.3.   小结: chapter_hashing/summary.md
-  - 8.     树:
-    - 8.1.   二叉树: chapter_tree/binary_tree.md
-    - 8.2.   二叉树遍历: chapter_tree/binary_tree_traversal.md
-    - 8.3.   二叉树数组表示: chapter_tree/array_representation_of_tree.md
-    - 8.4.   二叉搜索树: chapter_tree/binary_search_tree.md
-    - 8.5.   AVL 树 *: chapter_tree/avl_tree.md
-    - 8.6.   小结: chapter_tree/summary.md
-  - 9.     堆:
-    - 9.1.   堆: chapter_heap/heap.md
-    - 9.2.   建堆操作 *: chapter_heap/build_heap.md
-    - 9.3.   小结: chapter_heap/summary.md
-  - 10.     图:
-    - 10.1.   图: chapter_graph/graph.md
-    - 10.2.   图基础操作: chapter_graph/graph_operations.md
-    - 10.3.   图的遍历: chapter_graph/graph_traversal.md
-    - 10.4.   小结: chapter_graph/summary.md
+  - 6.     散列表:
+    - 6.1.   哈希表: chapter_hashing/hash_map.md
+    - 6.2.   哈希冲突处理: chapter_hashing/hash_collision.md
+    - 6.3.   小结: chapter_hashing/summary.md
+  - 7.     树:
+    - 7.1.   二叉树: chapter_tree/binary_tree.md
+    - 7.2.   二叉树遍历: chapter_tree/binary_tree_traversal.md
+    - 7.3.   二叉树数组表示: chapter_tree/array_representation_of_tree.md
+    - 7.4.   二叉搜索树: chapter_tree/binary_search_tree.md
+    - 7.5.   AVL 树 *: chapter_tree/avl_tree.md
+    - 7.6.   小结: chapter_tree/summary.md
+  - 8.     堆:
+    - 8.1.   堆: chapter_heap/heap.md
+    - 8.2.   建堆操作 *: chapter_heap/build_heap.md
+    - 8.3.   小结: chapter_heap/summary.md
+  - 9.     图:
+    - 9.1.   图: chapter_graph/graph.md
+    - 9.2.   图基础操作: chapter_graph/graph_operations.md
+    - 9.3.   图的遍历: chapter_graph/graph_traversal.md
+    - 9.4.   小结: chapter_graph/summary.md
+  - 10.     搜索算法:
+    - 10.1.   二分查找（New）: chapter_searching/binary_search.md
+    - 10.2.   二分查找边界（New）: chapter_searching/binary_search_edge.md 
+    - 10.3.   哈希优化策略: chapter_searching/replace_linear_by_hashing.md
+    - 10.4.   重识搜索算法: chapter_searching/searching_algorithm_revisited.md
+    - 10.5.   小结: chapter_searching/summary.md
   - 11.     排序算法:
     - 11.1.   排序算法: chapter_sorting/sorting_algorithm.md
     - 11.2.   冒泡排序: chapter_sorting/bubble_sort.md
@@ -186,16 +189,12 @@ nav:
     - 11.7.   计数排序: chapter_sorting/counting_sort.md
     - 11.8.   基数排序: chapter_sorting/radix_sort.md
     - 11.9.   小结: chapter_sorting/summary.md
-  - 12.     搜索算法:
-    - 12.1.   搜索算法（New）: chapter_searching/searching_algorithm_revisited.md
-    - 12.2.   哈希优化策略: chapter_searching/replace_linear_by_hashing.md
-    - 12.3.   小结: chapter_searching/summary.md
-  - 13.     回溯算法:
-    - 13.1.   回溯算法（New）: chapter_backtracking/backtracking_algorithm.md
-    - 13.2.   全排列问题（New）: chapter_backtracking/permutations_problem.md
-    - 13.3.   N 皇后问题（New）: chapter_backtracking/n_queens_problem.md
-  - 14.     附录:
-    - 14.1.   编程环境安装: chapter_appendix/installation.md
-    - 14.2.   一起参与创作: chapter_appendix/contribution.md
+  - 12.     回溯算法:
+    - 12.1.   回溯算法（New）: chapter_backtracking/backtracking_algorithm.md
+    - 12.2.   全排列问题（New）: chapter_backtracking/permutations_problem.md
+    - 12.3.   N 皇后问题（New）: chapter_backtracking/n_queens_problem.md
+  - 13.     附录:
+    - 13.1.   编程环境安装: chapter_appendix/installation.md
+    - 13.2.   一起参与创作: chapter_appendix/contribution.md
   - 参考文献:
     - chapter_reference/index.md