Sample solutions.
-* The solutions for p1-2 and p2 are okay.
+* The solutions for p1-1, p1-2, and p2 are okay.
+
+* The solution for p1-3 needs some work. It doesn't pass all of the
+ tests.
* The solution for p3 is terrible. For example, there's no locking at
all. I just wrote it to make sure that the project was possible