Interactive Problem D | Google Code Jam 2020 Qual Round

Interactive problem D from Google Code Jam 2020 Qualification Round. I go through an easier version first, then there's screencast with commentary from the actual contest, then solution summary. More info about the contest https://codingcompetitions.withgoogle.com/codejam & round link https://codingcompetitions.withgoogle.com/codejam/round/000000000019fd27

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