3 files changed, 1074 insertions, 0 deletions

diff --git a/day4/__init__.py b/day4/__init__.py
new file mode 100644
index 0000000..b917a9b
--- /dev/null
+++ b/day4/__init__.py
@@ -0,0 +1,68 @@
+# -*- coding: utf-8 -*-
+from abc import ABC
+from dataclasses import dataclass
+from typing import Tuple, Iterator, Any
+
+from aoc import BaseAssignment
+
+
+@dataclass
+class Section:
+    start: int
+    end: int
+
+    def fully_contains(self, other: "Section") -> bool:
+        return self.start <= other.start and self.end >= other.end
+
+    def overlaps(self, other: "Section") -> bool:
+        return (
+            self.start <= other.start <= self.end
+            or self.start <= other.end <= self.end
+            or self.fully_contains(other)
+            or other.fully_contains(self)
+        )
+
+
+class Assignment(BaseAssignment, ABC):
+    def parse_section(self, section: str) -> Section:
+        start, end = section.split("-")
+
+        return Section(
+            start=int(start),
+            end=int(end),
+        )
+
+    def parse_sections(self, sections: str) -> Tuple[Section, Section]:
+        section_1, section_2 = sections.split(",")
+
+        return (self.parse_section(section_1), self.parse_section(section_2))
+
+    def check(self, section_1: Section, section_2: Section) -> bool:
+        raise NotImplementedError()
+
+    def run(self, input: Iterator) -> Any:
+        overlapping = []
+
+        for sections in input:
+            section_1, section_2 = self.parse_sections(sections)
+
+            if self.check(section_1, section_2):
+                overlapping.append((section_1, section_2))
+
+        return len(overlapping)
+
+
+class AssignmentOne(Assignment):
+    example_result = 2
+
+    def check(self, section_1: Section, section_2: Section) -> bool:
+        return section_1.fully_contains(section_2) or section_2.fully_contains(
+            section_1
+        )
+
+
+class AssignmentTwo(Assignment):
+    example_result = 4
+
+    def check(self, section_1: Section, section_2: Section) -> bool:
+        return section_1.overlaps(section_2)
diff --git a/day4/example.txt b/day4/example.txt
new file mode 100644
index 0000000..9f9e9cf
--- /dev/null
+++ b/day4/example.txt
@@ -0,0 +1,6 @@
+2-4,6-8
+2-3,4-5
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+2-8,3-7
+6-6,4-6
+2-6,4-8
diff --git a/day4/input.txt b/day4/input.txt
new file mode 100644
index 0000000..c84044f
--- /dev/null
+++ b/day4/input.txt
@@ -0,0 +1,1000 @@
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