How to Trade Off Memory for CPU Cycles

For a truly intermediate programmer, you can't be a good one without knowing the basic computational complexity theory. You don't have to go deep into big O notation but at least need to know what constant time logarithms are going to be or n log in or n squared. So quadratic type things. If you don't know these, then that means you probably don't even know when you're doing something bad, right? Yeah.