Textbooks

• Algorithms by Dasgupta, Papadimitriou, Vazirani. On reserve at Grainger. Very readable and nice book. A draft is available online for free.
  Update: It seems that the authors took down the free version. A web search led to this version.
• Jon Kleinberg and Éva Tardos. Algorithm Design. Addison-Wesley, 2005. Excellent book although not so cheap. Many good exercises and woderful chapter on network flows. More formal analysis than the Dasgupta etal book.

Other recommended reading:

• Jeff Erickson's algorithms material (highly recommended).
• Course material from Spring 2013 with pointers to past semesters.
• Introduction to Algorithms by Cormen, Leiserson, Rivest, Stein. On reserve at Grainger.
• Computers and Intractability by Garey and Johnson. On reserve at Grainger.