Did your school used the specific terms "linear programming" and "dynamic programming" to refer to those topics? My original comment didn't phrase this clearly, but I was thinking less about techniques themselves, and more about encountering them under those specific labels.

As an analogy, it's not unusual to learn a good chunk of calculus before learning that "calculus" is a thing they're part of - for example, by having an over-eager physics teacher who teaches you some of it so we can understand physics material deeper, but without ever mentioning the branch of math we're now using.