title: keep std vector/list sorted while insert, or sort all
body: <p>Lets say I have 30000 objects in my vector/list. Which I add one by one.<br/>
  I need them sorted.<br/>
  Is it faster to sort all at once (like std::sort), or keep vector/list sorted while I add object one by one?</p>
  
  <p>vector/list WILL NOT be modified later.</p>