From 4297f4b52da426453e9372dbe3c4f51b41ba52b8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E9=BB=84=E6=B5=B7?= <10402852@qq.com>
Date: Fri, 19 Jan 2024 16:50:27 +0800
Subject: [PATCH] 'commit'

---
 TangDou/Topic/【换根DP】专题.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/TangDou/Topic/【换根DP】专题.md b/TangDou/Topic/【换根DP】专题.md
index 1fc37d6..828e39e 100644
--- a/TangDou/Topic/【换根DP】专题.md
+++ b/TangDou/Topic/【换根DP】专题.md
@@ -1269,6 +1269,8 @@ signed main() {
 }
 ```
 #### [$V-Subtree$](https://www.luogu.com.cn/problem/AT_dp_v)
+https://blog.csdn.net/Emm_Titan/article/details/123875298
+
 **题意**
 给定一棵 $N$ 个节点的树，现在需要将每一个节点染成黑色或白色。