It depends on what you want to do. Carmen or Robert Sedgewick are what you get in an Algorithms class at University.
Do you code for food now? If so, you need to read, starting now, keep on until you die.
Start with 'Art of Programming' by Knuth. If you just want a more nearly cookbook approach Knuth is not for you. Consider Carmen or Robert Sedgewick (two books). If you are into doing maths, consider Numerical Recipes in C.
The problem is that you cannot predict what you employer will want 5 years from now. It's nice to say, "yes, I've seen that and can do basic things with <fill in the blank>".
It's known as being indespensible.