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58 lines
2.5 KiB
Markdown
58 lines
2.5 KiB
Markdown
2 years ago
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https://adventofcode.com/2022/day/2
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## \--- Day 2: Rock Paper Scissors ---
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The Elves begin to set up camp on the beach. To decide whose tent gets to be
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closest to the snack storage, a giant [Rock Paper
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Scissors](https://en.wikipedia.org/wiki/Rock_paper_scissors) tournament is
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already in progress.
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Rock Paper Scissors is a game between two players. Each game contains many
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rounds; in each round, the players each simultaneously choose one of Rock,
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Paper, or Scissors using a hand shape. Then, a winner for that round is
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selected: Rock defeats Scissors, Scissors defeats Paper, and Paper defeats
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Rock. If both players choose the same shape, the round instead ends in a draw.
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Appreciative of your help yesterday, one Elf gives you an _encrypted strategy
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guide_ (your puzzle input) that they say will be sure to help you win. "The
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first column is what your opponent is going to play: `A` for Rock, `B` for
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Paper, and `C` for Scissors. The second column--" Suddenly, the Elf is called
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away to help with someone's tent.
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The second column, you reason, must be what you should play in response: `X`
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for Rock, `Y` for Paper, and `Z` for Scissors. Winning every time would be
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suspicious, so the responses must have been carefully chosen.
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The winner of the whole tournament is the player with the highest score. Your
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_total score_ is the sum of your scores for each round. The score for a single
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round is the score for the _shape you selected_ (1 for Rock, 2 for Paper, and
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3 for Scissors) plus the score for the _outcome of the round_ (0 if you lost,
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3 if the round was a draw, and 6 if you won).
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Since you can't be sure if the Elf is trying to help you or trick you, you
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should calculate the score you would get if you were to follow the strategy
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guide.
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For example, suppose you were given the following strategy guide:
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[code]
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A Y
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B X
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C Z
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[/code]
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This strategy guide predicts and recommends the following:
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* In the first round, your opponent will choose Rock (`A`), and you should choose Paper (`Y`). This ends in a win for you with a score of _8_ (2 because you chose Paper + 6 because you won).
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* In the second round, your opponent will choose Paper (`B`), and you should choose Rock (`X`). This ends in a loss for you with a score of _1_ (1 + 0).
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* The third round is a draw with both players choosing Scissors, giving you a score of 3 + 3 = _6_.
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In this example, if you were to follow the strategy guide, you would get a
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total score of `_15_` (8 + 1 + 6).
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_What would your total score be if everything goes exactly according to your
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strategy guide?_
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