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Another interesting problem to solve. I gained a much better understanding
of disjoint sets (aka Union/Find) through the coding challenge. A few takeaways:
1. Writing test cases is so important. I can sink my teeth into it and
have something concrete to work on, instead of wasting time beating around the bush;
2. Modify starter code to make it testable, if it's not easy to test to
begin with;
3. Get started early, so I can use my "sleep on it" technique. It really
improves understanding!
4. I'm slightly bothered by the fact that I don't have a test case to catch
the issue with grader test case 8. I looked at the code and added line 61
which enabled me to pass the grader.
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