NP And Approximation
Know about the most famous classes of NP-complete problems, such as traveling salesman and the knapsack problem, and be able to recognize them when an interviewer asks you them in disguise.
Know what NP-complete means.
Greedy Algs. II & Intro to NP Completeness - Simonson (video)
Lecture 26 - NP-Completeness Challenge - CSE373 Skiena (video)
Complexity: P, NP, NP-completeness, Reductions - MIT 6.046 (video)
Peter Norvig discusses near-optimal solutions to traveling salesman problem:
Pages 1048 - 1140 in CLRS if you have it.