Better way of filling vector in smartPointer exercise

@bgruber what do you think of this fix ? Avoids to use the reset, and optimizes the object creation by removing even the move operations.

code/smartPointers/solution/smartPointers.sol.cpp

@@ -155,9 +155,10 @@ void processElement(const LargeObject* /*element*/) { }
 // model, this becomes a mess.
 void problem3() {
     // Let's generate a vector with 10 pointers to LargeObject
-    std::vector<std::shared_ptr<LargeObject>> objVector(10);
-    for (auto& ptr : objVector) {
-        ptr.reset(new LargeObject());
+    std::vector<std::shared_ptr<LargeObject>> objVector;
+    objVector.resize(10);
+    for (unsigned int i = 0; i < 10; i++) {
+        objVector.emplace_back(new LargeObject());
     }
 
     // Let's copy it