Assignment #2 and beginning of Loop Invariant

Assignment 2 was due this Monday,and boy was it ever challenging.The question about the recursive formula for the number of ternary trees took me for ever to figure out,however by a combination of knowledge from STA247(at last some use from the course),and help from the T.A's at the aid center,We were able to finish it quite satisfactorily.Otherwise,in lecture this week,we began talking about loop-invariants,which are sort of relational tools in that they help you more fully understand the functioning of a particular loop.Personally,i am finding them a little bit strange to deal with right now,but i guess in due course,i will grow to understand them.