









l 
What do we mean when we say a problem




is in P?




n 
A: A
solution can be found in polynomial time



l 
What do we mean when we say a problem




is in NP?




n 
A: A
solution can be verified in polynomial time


l 
What is the relation between P
and NP?




n 
A: P
Í NP, but no one knows whether P = NP

