add 2020 day 6

README.md

@@ -3,7 +3,7 @@
 [![AoC 2017](https://img.shields.io/badge/2017-★_24-bcb01b)](https://adventofcode.com/2017)
 [![AoC 2018](https://img.shields.io/badge/2018-★_9-fb7938)](https://adventofcode.com/2018)
 [![AoC 2019](https://img.shields.io/badge/2019-★_6-f26e3c)](https://adventofcode.com/2019)
-[![AoC 2020](https://img.shields.io/badge/2020-★_4-ec683f)](https://adventofcode.com/2020)
+[![AoC 2020](https://img.shields.io/badge/2020-★_6-f26e3c)](https://adventofcode.com/2020)
 [![AoC 2021](https://img.shields.io/badge/2021-★_50-44cc11)](https://adventofcode.com/2021)
 [![AoC 2022](https://img.shields.io/badge/2022-★_50-44cc11)](https://adventofcode.com/2022)
 [![AoC 2023](https://img.shields.io/badge/2023-★_0-9f9f9f)](https://adventofcode.com/2023)

y2020/d06/__init__.py

@@ -0,0 +1,3 @@
+__year__ = 2020
+__day__ = 6
+__title__ = "Custom Customs"

y2020/d06/cases/example.11.6.txt

@@ -0,0 +1,15 @@
+abc
+
+a
+b
+c
+
+ab
+ac
+
+a
+a
+a
+a
+
+b

y2020/d06/cases/example.6..txt

@@ -0,0 +1,3 @@
+abcx
+abcy
+abcz

y2020/d06/solution.py

@@ -0,0 +1,37 @@
+import functools
+import operator
+
+from aoc.lib.solution import SolutionBase
+
+import logging
+
+
+__all__ = ["Solution"]
+__log__ = logging.getLogger(__name__)
+
+
+class Solution(SolutionBase):
+    @staticmethod
+    def prepare(data):
+        if not any(isinstance(entry, list) for entry in data):
+            data = [data]
+        result = []
+        for entry in data:
+            if isinstance(entry, str):
+                result.append([set(entry)])
+            else:
+                result.append([set(e) for e in entry])
+        return tuple(result)
+
+    @staticmethod
+    def generic(data, function):
+        return sum(len(functools.reduce(function, entry)) for entry in data)
+
+    part_01 = functools.partial(generic, function=operator.__or__)
+    part_02 = functools.partial(generic, function=operator.__and__)
+
+
+if __name__ == "__main__":
+    import aoc.lib.main
+
+    aoc.lib.main.main(Solution)