What will be printed out as a result of the following code execution?
#include <vector>
#include <iostream>

struct A {
  A(int i) { std::cout << "A(" << i << ")"; }
  ~A() { std::cout << "~A()"; }

int main() {
  std::vector<A *> a;

  for (int i = 0; i < 3; i++) {
    a.push_back(new A(i));
  return 0;
STL containers do not call delete for pointers to objects, so the ~A() destructor will not be called once and there will be a memory leak allocated for objects of class A stored in std::vector

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