1 files changed, 2 insertions, 0 deletions
diff --git a/exercise-template.cpp b/exercise-template.cpp
index 38099b7..8986133 100644
--- a/exercise-template.cpp
+++ b/exercise-template.cpp
@@ -1,4 +1,5 @@
 #include <iostream>
+#include <vector>
 #include "sales_data.hpp"
 #include "sales_item.hpp"
 
@@ -15,6 +16,7 @@ using std::cin;
 using std::cerr;
 using std::clog;
 using std::endl;
+using std::vector;
 int main () {