Ah, the classic C++ compiler error that haunts every novice (and sometimes veteran) programmer! Forget to #include <vector> at the top of your file? Congratulations, you've just been vectored โ ambushed by compiler errors more cryptic than ancient hieroglyphics. The compiler doesn't politely suggest "Hey friend, maybe add that header?" Instead, it unleashes 47 lines of template instantiation errors that basically translate to "I have no idea what a vector is, and at this point I'm too afraid to ask." It's like showing up to a fancy restaurant without a reservation and getting absolutely roasted by the host.