From 167e0125acbe3f0c898a764bff176d6a2977cfac Mon Sep 17 00:00:00 2001
From: Joscha <joscha@plugh.de>
Date: Tue, 6 Dec 2022 15:18:41 +0100
Subject: [PATCH] [py] Port 2018_02

---
 py/2018/02/solve.py | 63 ---------------------------------------------
 py/aoc/__init__.py  |  3 ++-
 py/aoc/y2018/d02.py | 57 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 59 insertions(+), 64 deletions(-)
 delete mode 100644 py/2018/02/solve.py
 create mode 100644 py/aoc/y2018/d02.py

diff --git a/py/2018/02/solve.py b/py/2018/02/solve.py
deleted file mode 100644
index 73a8e85..0000000
--- a/py/2018/02/solve.py
+++ /dev/null
@@ -1,63 +0,0 @@
-import sys
-
-def load_words(filename):
-	words = []
-	with open(filename, "r") as f:
-		for line in f:
-			words.append(line[:-1])
-	return words
-
-# PART 1
-
-def has_n_chars(word, n):
-	count = {}
-	for char in word:
-		count[char] = count.get(char, 0) + 1
-	return n in count.values()
-
-def count_words(words):
-	twice = 0
-	thrice = 0
-	for word in words:
-		if has_n_chars(word, 2):
-			twice += 1
-		if has_n_chars(word, 3):
-			thrice += 1
-	return twice, thrice
-
-def checksum(words):
-	twice, thrice = count_words(words)
-	return twice * thrice
-
-# PART 2
-
-def differ_by(a, b):
-	count = 0
-	for x, y in zip(a, b):
-		if x != y:
-			count += 1
-	return count
-
-def find_ids(words):
-	for i, a in enumerate(words):
-		for b in words[i:]:
-			if differ_by(a, b) == 1:
-				return a, b
-
-def common_chars(a, b):
-	result = []
-	for x, y in zip(a, b):
-		if x == y:
-			result.append(x)
-	return "".join(result)
-
-def main(filename):
-	words = load_words(filename)
-	print(f"Solutions for {filename}")
-	print(f"Part 1: {checksum(words)}")
-	a, b = find_ids(words)
-	print(f"Part 2: {common_chars(a, b)}")
-
-if __name__ == "__main__":
-	for filename in sys.argv[1:]:
-		main(filename)
diff --git a/py/aoc/__init__.py b/py/aoc/__init__.py
index 4cbb592..ce1293e 100644
--- a/py/aoc/__init__.py
+++ b/py/aoc/__init__.py
@@ -2,13 +2,14 @@ import sys
 import argparse
 from pathlib import Path
 
-from .y2018 import d01
+from .y2018 import d01, d02
 from .y2020 import d10
 from .y2021 import d14
 from .y2022 import d01, d02, d03, d04, d05, d06
 
 DAYS = {
     "2018_01": y2018.d01.solve,
+    "2018_02": y2018.d02.solve,
     "2020_10": y2020.d10.solve,
     "2021_14": y2021.d14.solve,
     "2022_01": y2022.d01.solve,
diff --git a/py/aoc/y2018/d02.py b/py/aoc/y2018/d02.py
new file mode 100644
index 0000000..772a5b1
--- /dev/null
+++ b/py/aoc/y2018/d02.py
@@ -0,0 +1,57 @@
+# PART 1
+
+
+def has_n_chars(word, n):
+    count = {}
+    for char in word:
+        count[char] = count.get(char, 0) + 1
+    return n in count.values()
+
+
+def count_words(words):
+    twice = 0
+    thrice = 0
+    for word in words:
+        if has_n_chars(word, 2):
+            twice += 1
+        if has_n_chars(word, 3):
+            thrice += 1
+    return twice, thrice
+
+
+def checksum(words):
+    twice, thrice = count_words(words)
+    return twice * thrice
+
+
+# PART 2
+
+
+def differ_by(a, b):
+    count = 0
+    for x, y in zip(a, b):
+        if x != y:
+            count += 1
+    return count
+
+
+def find_ids(words):
+    for i, a in enumerate(words):
+        for b in words[i:]:
+            if differ_by(a, b) == 1:
+                return a, b
+
+
+def common_chars(a, b):
+    result = []
+    for x, y in zip(a, b):
+        if x == y:
+            result.append(x)
+    return "".join(result)
+
+
+def solve(inputstr):
+    words = inputstr.splitlines()
+    print(f"Part 1: {checksum(words)}")
+    a, b = find_ids(words)
+    print(f"Part 2: {common_chars(a, b)}")