From f315ef05c548da80410cb4f6665a9bba7a953f94 Mon Sep 17 00:00:00 2001
From: Tom van der Lee <tom@vanderlee.io>
Date: Tue, 2 Dec 2025 07:57:38 +0100
Subject: Day 1 and 2

---
 day1/__init__.py | 60 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 day1/__init__.py

(limited to 'day1/__init__.py')

diff --git a/day1/__init__.py b/day1/__init__.py
new file mode 100644
index 0000000..6e95329
--- /dev/null
+++ b/day1/__init__.py
@@ -0,0 +1,60 @@
+# -*- coding: utf-8 -*-
+from abc import ABC
+from typing import Iterator
+
+from aoc import BaseAssignment, I
+
+
+class Assignment(BaseAssignment, ABC):
+    def parse_item(self, item: str) -> Iterator[I]:
+        [rotation, *places] = item
+        places = int("".join(places))
+
+        yield -places if rotation == "L" else places
+
+
+class AssignmentOne(Assignment):
+    example_result = 3
+
+    def run(self, input: Iterator[int]) -> int:
+        seen_0 = 0
+        position = 50
+        for rotation in input:
+            position = (position + rotation) % 100
+            if position == 0:
+                seen_0 += 1
+
+        return seen_0
+
+
+class AssignmentTwo(Assignment):
+    example_result = 6
+
+    @staticmethod
+    def calculate_new_position(position, rotation) -> tuple[int, int]:
+        previous_position = position
+        new_position = position + rotation
+
+        overturned = new_position >= 100 or new_position < 0
+
+        multiplier = position - (0 - -previous_position) // 100
+
+        if overturned:
+            new_position = new_position % 100
+
+        seen_0 = 0
+        if new_position == 0 and multiplier == 0:
+            seen_0 += multiplier + 1
+        elif overturned:
+            seen_0 += multiplier
+
+        return new_position, seen_0
+
+    def run(self, input: Iterator[int]) -> int:
+        seen_0_total = 0
+        position = 50
+        for rotation in input:
+            position, seen_0 = self.calculate_new_position(position, rotation)
+            seen_0_total += seen_0
+
+        return seen_0_total
-- 
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