Two Lists with same length

A:    a1 → a2
               ↘
                 c1 → c2 → c3
               ↗            
B:    b1 → b2

Use two iters go through the list, and compare each val. It is easy to find out the intersection point.

What if the length is not the same

Make them the same.

  • find out two lists' length
  • trim the longer one and remove the overhead