title: Linear time v.s. Quadratic time
body: <p>Often, some of the answers mention that a given solution is <strong>linear</strong>, or that another one is <strong>quadratic</strong>.</p>
  
  <p>How to make the difference / identify what is what?</p>
  
  <p>Can someone explain this, the easiest possible way, for the ones like me who still don't know?</p>