Parts 1-4 are in one volume, and then part 5 (graph algorithms) is big enough that it gets its own volume. I own the parts 1-4 book, and it's very pleasant and

Parts 1-4 are in one volume, and then part 5 (graph algorithms) is big enough that it gets its own volume. I own the parts 1-4 book, and it's very pleasant and readable. The pictures of the algorithms in action really help make the concepts clearer. (They're also a cool hack; the author wrote implementations of the algorithms with a bunch of printf calls to spit out PostScript code, which used a high-level graphics API that he wrote, in PostScript, for the purpose of making diagrams of running algorithms.)