2D dynamic bool array?

I want to create a 2D dynamic bool array (or char is fine too). I'm doing the n-queens problem and I've figured everything out except for this part. Any help?

But teachers generally do not like arguments like "the compiler is clever and makes up for my cluelessness", so you should favor iteration instead of recursion in your C code.

Then your teachers are teaching the wrong thing. The programmer should not have to be clever and make up for the compiler's cluelessness. If you like hand optimizing enjoy your assembly code.