deleted .vscode

.gitignore

@@ -1,2 +1,3 @@
 *.o
 *
+*.vscode

2Q_cache.h

@@ -76,7 +76,7 @@ public:
             answer += std::to_string(*i) + " ";
         }
 
-        answer.pop_back();
+        answer.pop_back();                                                      //delete last space
 
         return answer;
     }