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Question -1:
This question has no scoring guidelines in the spreadsheet, although I did manage to pass the test when running the code. This problem made me learn to pay more attention to the wording of everything. In part A, I didn't realize at first that getCheck() had a parameter, but I noticed it while finishing up that part. In part B, I finally realized that the methods used are static, and I later noticed that you can modify the isValid() method as long as the header isn't changed.
Question 0:
I later realized for part A, I could've easily used a for-each loop to make it a lot shorter. My solution still worked fine though. In part B, I initially didn't pass the test due to messing up the for loop. I had i < purchases.size() at first, but I needed to have it be i < purchases.size() - 1, since j would be going one spot further. I corrected it later on. I also could've done part b without making a variable j, so while what I did works, it's longer. For part C, I didn't realize I needed a method parameter (which I fixed later).
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