diff --git a/f1.cpp b/f1.cpp
index 97ea106..4720dc1 100644
--- a/f1.cpp
+++ b/f1.cpp
@@ -29,6 +29,7 @@ bool F1::run()
     }
 
     vector<pair<int, int>> edges;
+    edges.reserve(total);
     for (int i = 2; i <= N; ++i)
     {
         edges.push_back({1, i});
@@ -43,4 +44,4 @@ bool F1::run()
     }
 
     return true;
-}
+}
\ No newline at end of file
diff --git a/post_test.sh b/post_test.sh
old mode 100755
new mode 100644