title: sharir kosaraju algorithm and vertices
body: <p>Let's say we run sharir kosaraju algorithm on a Directed graph. And we have an arc (u,v) on this graph.
  In this algorithm we have two DFS passes. 
  Now suppose we insert vertex u into the first depth tree T.
  Where can v appear? Is it in another tree created earlier or maybe later?
  Thanks in advance !</p>
  
  <p>I'm learning for a test... So this is a kind of homework I guess but I really have no clue!</p>