Reddit mentions of Discrete Mathematics: Introduction to Mathematical Reasoning

Have you covered discrete structures? I really liked book by Susan Epp here, expensive but worth it.

I found that you need to really understand the language in which algorithms are taught first. For example in Java you need to know how to implement equals(), hashCode(), Comparable and Comparator really well before you dive into DS.

Then the book your prof chooses is REALLY important. If you find it too hard or too easy for you, google around and see what other profs are using.