Update the page tree

codes/cpp/chapter_backtracking/preorder_find_constrained_paths.cpp

@@ -11,6 +11,7 @@ vector<vector<TreeNode *>> res;
 
 /* 前序遍历 */
 static void preOrder(TreeNode *root) {
+    // 剪枝
     if (root == nullptr || root->val == 3) {
         return;
     }

mkdocs.yml

@@ -169,7 +169,7 @@ nav:
   - 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（New）: chapter_graph/graph_traversal.md
+    - 9.3.   图的遍历: chapter_graph/graph_traversal.md
     - 9.4.   小结: chapter_graph/summary.md
   - 10.     查找算法:
     - 10.1.   线性查找: chapter_searching/linear_search.md
@@ -187,7 +187,7 @@ nav:
     - 11.8.   基数排序（New）: chapter_sorting/radix_sort.md
     - 11.9.   小结: chapter_sorting/summary.md
   - 12.     回溯算法:
-    - 12.1.   回溯算法: chapter_backtracking/backtracking_algorithm.md
+    - 12.1.   回溯算法（New）: chapter_backtracking/backtracking_algorithm.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