A lot recursion... which makes me so frustrating. However, this topic really needs practice to understand it well. On E3 Part 1, I was trying to make a class to do it, but it did not go well. After reading the handout thousands of times, I realized it was much more easier to consider it as a list instead of tree, and then problems solved. I think I do need more practice for recursion, there is actually something like formula that could make the recursion problem much more easier, which was ementioned in the handout couple times, Starting from the small problems, and then try larger one.
As for A2, I guess A2 part1 did not go well, I think I might get confused by the new concept Regular expressions. Gonna work harder on this.
nice
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