diff --git a/problems/图论并查集理论基础.md b/problems/图论并查集理论基础.md
index 5cd753e9..2f61b09d 100644
--- a/problems/图论并查集理论基础.md
+++ b/problems/图论并查集理论基础.md
@@ -285,9 +285,8 @@ join(1, 8);
 join(3, 8);
 join(1, 7);
 join(8, 5);
-join(6, 2);
 join(2, 9);
-
+join(6, 2);
 ```
 
 此时我们生成的的有向图为：