From 2366ab4ea5f35952862be9437dacc1e52d9e40aa Mon Sep 17 00:00:00 2001
From: stevebraveman <42559612+stevebraveman@users.noreply.github.com>
Date: Wed, 29 Aug 2018 10:08:00 +0800
Subject: [PATCH] Update dsu.md

---
 docs/ds/dsu.md | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/docs/ds/dsu.md b/docs/ds/dsu.md
index be847247..313e7cde 100644
--- a/docs/ds/dsu.md
+++ b/docs/ds/dsu.md
@@ -99,6 +99,16 @@ void unionSet(int x,int y)
 
 显然为 $O(n)$。
 
+### 经典题目
+
+[[NOI2015]程序自动分析](https://www.lydsy.com/JudgeOnline/problem.php?id=4195)
+
+[[JSOI2008]星球大战](https://www.lydsy.com/JudgeOnline/problem.php?id=1015)
+
+[[NOI2001]食物链](https://www.luogu.org/problemnew/show/P2024)
+
+[[NOI2002]银河英雄传说](https://www.luogu.org/problemnew/show/P1196)
+
 ## 其他应用
 
 [最小生成树](/graph/mst) Kruskal 算法。
-- 
2.11.0