DFS

DFS

Used for cycle detection

Test link to another page: First_Page

Implementation

 DFS_visit(u) {
     time = time + 1
     d[u] = time
     color[u] = 'grey'
     for each v in adj[u] {
         if color[u] == white
             DFS_visit(u)
     }
     f[u] = time++
     color[u] = black
 }