Update mst.md

diff --git a/docs/graph/mst.md b/docs/graph/mst.md
index 46149a6..dad6068 100644 (file)
--- a/docs/graph/mst.md
+++ b/docs/graph/mst.md
@@ -287,8 +287,8 @@ Kruskal 算法中的「集合」，能否进一步优化？
     ```cpp
     #include <algorithm>
     #include <cstdio>
-    ```
-
+    
+    
     struct Edge {
         int x, y, z;
     };