4.5, due on October 15

Difficult:
I still have to think about it for a second to get the difference between NP, NP-hard, and NP-complete problems. It will take awhile to build up the intuition for that.

Reflective:
IOne question I have is, how do you prove things about the difficulty of problems? It is straightforward to prove that there exists a solution in O(n^2) if you know what that solution is. But how can you prove that no solution exists that is faster than a certain complexity?

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