This exercise will let you practice using 2D arrays and hashmaps on a more challenging set of problems.
You will do this exercise yourself except if you like you can find a partner and collaborate on exactly 1 of the problems. Note in your comments which problem you collaborated on and who you collaborated with.
Total possible: 80 points (+5 extra credit).
The problems themselves are already reasonably documented — don’t worry about writing class/method comments on this program but do keep your code clean, well formatted, and understandable.