From ade482858a8e03641e818d1203983a312d88ee8b Mon Sep 17 00:00:00 2001
From: krahets <krahets@163.com>
Date: Sun, 16 Apr 2023 16:39:59 +0800
Subject: [PATCH] build

---
 chapter_backtracking/backtracking_algorithm.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/chapter_backtracking/backtracking_algorithm.md b/chapter_backtracking/backtracking_algorithm.md
index ff387a967..bc34f0dd6 100644
--- a/chapter_backtracking/backtracking_algorithm.md
+++ b/chapter_backtracking/backtracking_algorithm.md
@@ -290,6 +290,7 @@ comments: true
     ```cpp title="preorder_find_constrained_paths.cpp"
     /* 前序遍历 */
     void preOrder(TreeNode *root) {
+        // 剪枝
         if (root == nullptr || root->val == 3) {
             return;
         }