From 04c141b2c18bcd77491f2f6c870b965968330cdc 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 08:25:35 +0800
Subject: [PATCH] 'commit'

---
 TangDou/Topic/HuanGenDp/SubTree.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/TangDou/Topic/HuanGenDp/SubTree.cpp b/TangDou/Topic/HuanGenDp/SubTree.cpp
index 57d1386..3970dc7 100644
--- a/TangDou/Topic/HuanGenDp/SubTree.cpp
+++ b/TangDou/Topic/HuanGenDp/SubTree.cpp
@@ -34,6 +34,12 @@ void dfs1(int u, int fa) {
         son.push_back(v); // 将子节点加入集合，方便之后操作
     }
 
+    //这里面的t1,t2,其实也可以不用:
+    //pre[son[0]]:1
+    //pre[son[1]]: pre[son[0]] * (f[son[1]] + 1) % mod
+    //...
+    //pre[son[i]]: pre[son[i-1]] * (f[son[i]] + 1) % mod
+
     int t1 = 1; // 前缀积取模后的值
     int t2 = 1; // 后缀积取模后的值