''Algorithms from P to Np'' 
by Bernard M. E. Moret, H.D. Shapiro 

Peek Inside (Courtesy Amazon): http://www.amazon.com/gp/reader/0805380086/ref=sib_dp_pt/002-2641472-0020005#reader-link

ISBN 0805380086 Explains many fundamental graph and other algorithms. Introduces (I think) amortized complexity measures. Provides the necessary math in some introductory chapters.
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More on this subject:
* http://www2.latech.edu/~choi/Bens/Teaching/Csc520/PowerPoint/CH13.ppt
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CategoryBook