day2 part 1

README.md

@@ -0,0 +1,3 @@
+# Advent of code 2022
+
+My attempt at solving Advent of code 2022

day2/README.md

@@ -0,0 +1,42 @@
+# Day 2: Rock Paper Scissors
+
+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
+Paper Scissors tournament is already in progress.
+
+Rock Paper Scissors is a game between two players. Each game contains many rounds; in each round, the players each
+simultaneously choose one of Rock, Paper, or Scissors using a hand shape. Then, a winner for that round is selected:
+Rock defeats Scissors, Scissors defeats Paper, and Paper defeats Rock. If both players choose the same shape, the round
+instead ends in a draw.
+
+Appreciative of your help yesterday, one Elf gives you an **encrypted strategy guide** (your puzzle input) that they say
+will be sure to help you win. "The first column is what your opponent is going to play: `A` for Rock, `B` for Paper,
+and `C` for Scissors. The second column--" Suddenly, the Elf is called away to help with someone's tent.
+
+The second column, you reason, must be what you should play in response: X for Rock, Y for Paper, and Z for Scissors.
+Winning every time would be suspicious, so the responses must have been carefully chosen.
+
+The winner of the whole tournament is the player with the highest score. Your **total score** is the sum of your scores for
+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
+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).
+
+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
+you were to follow the strategy guide.
+
+For example, suppose you were given the following strategy guide:
+
+```
+A Y
+B X
+C Z
+```
+
+This strategy guide predicts and recommends the following:
+
+- 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).
+- 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).
+- The third round is a draw with both players choosing Scissors, giving you a score of 3 + 3 = **6**.
+  In this example, if you were to follow the strategy guide, you would get a total score of **15** (8 + 1 + 6).
+
+**What would your total score be if everything goes exactly according to your strategy guide?**

day2/main.py

@@ -0,0 +1,41 @@
+from typing import Generator
+
+
+def total_score(data: Generator[list[str]]):
+    points = {
+        "A": 1,
+        "B": 2,
+        "C": 3,
+        "X": 1,
+        "Y": 2,
+        "Z": 3,
+    }
+    score = 0
+    for row in data:
+        a, b = row
+        res = (points[a] - points[b]) % 3
+        if res == 0:
+            # it's a draw
+            score += 3 + points[b]
+        elif res == 2:
+            # won
+            score += 6 + points[b]
+        else:
+            # lose
+            score += points[b]
+    return score
+
+
+def read_data() -> Generator[list[str]]:
+    with open("./input.txt", "r") as f:
+        return (row.strip().split(" ") for row in f.readlines())
+
+
+if __name__ == "__main__":
+    test_data = [
+        ("A", "Y"),
+        ("B", "X"),
+        ("C", "Z"),
+    ]
+    data = read_data()
+    print(total_score(data))