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61 lines
No EOL
3.5 KiB
Markdown
61 lines
No EOL
3.5 KiB
Markdown
# 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 closest to the snack storage, a giant Rock
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Paper Scissors tournament is already in progress.
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Rock Paper Scissors is a game between two players. Each game contains many rounds; in each round, the players each
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simultaneously choose one of Rock, Paper, or Scissors using a hand shape. Then, a winner for that round is selected:
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Rock defeats Scissors, Scissors defeats Paper, and Paper defeats Rock. If both players choose the same shape, the round
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instead ends in a draw.
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Appreciative of your help yesterday, one Elf gives you an **encrypted strategy guide** (your puzzle input) that they say
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will be sure to help you win. "The first column is what your opponent is going to play: `A` for Rock, `B` for Paper,
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and `C` for Scissors. The second column--" Suddenly, the Elf is called 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 for Rock, Y for Paper, and Z for Scissors.
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Winning every time would be 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 **total score** is the sum of your scores
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for
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each round. The score for a single round is the score for the **shape you selected** (1 for Rock, 2 for Paper, and 3 for
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Scissors) plus the score for the **outcome of the round** (0 if you lost, 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 should calculate the score you would get if
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you were to follow the strategy guide.
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For example, suppose you were given the following strategy guide:
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```
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A Y
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B X
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C Z
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```
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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
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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
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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 total score of **15** (8 + 1 + 6).
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**What would your total score be if everything goes exactly according to your strategy guide?**
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## Part Two
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The Elf finishes helping with the tent and sneaks back over to you. "Anyway, the second column says how the round needs
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to end: `X` means you need to lose, `Y` means you need to end the round in a draw, and `Z` means you need to win. Good luck!"
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The total score is still calculated in the same way, but now you need to figure out what shape to choose so the round
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ends as indicated. The example above now goes like this:
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- In the first round, your opponent will choose Rock (A), and you need the round to end in a draw (Y), so you also
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choose Rock. This gives you a score of 1 + 3 = **4**.
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- In the second round, your opponent will choose Paper (B), and you choose Rock so you lose (X) with a score of 1 + 0 =
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**1**.
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- In the third round, you will defeat your opponent's Scissors with Rock for a score of 1 + 6 = **7**. Now that you're
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correctly decrypting the ultra top secret strategy guide, you would get a total score of **12**.
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Following the Elf's instructions for the second column, **what would your total score be if everything goes exactly
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according to your strategy guide?** |