[py] Port 2021_14

py/aoc/__init__.py

@@ -2,9 +2,11 @@ import sys
 import argparse
 from pathlib import Path
 
+from .y2021 import d14
 from .y2022 import d01, d02, d03, d04
 
 DAYS = {
+    "2021_14": y2021.d14.solve,
     "2022_01": y2022.d01.solve,
     "2022_02": y2022.d02.solve,
     "2022_03": y2022.d03.solve,

py/aoc/y2021/d14.py

@@ -1,7 +1,7 @@
-import argparse
 from pathlib import Path
 from collections import Counter
 
+
 def step(pairs, rules):
     result = Counter()
     for pair, amount in pairs.items():
@@ -13,6 +13,7 @@ def step(pairs, rules):
             result[pair] += amount
     return result
 
+
 def count_chars(template, pairs):
     chars = Counter()
     for pair, amount in pairs.items():
@@ -20,20 +21,15 @@ def count_chars(template, pairs):
     chars[template[-1]] += 1
     return chars
 
-def main():
-    parser = argparse.ArgumentParser()
-    parser.add_argument("file", type=Path)
-    args = parser.parse_args()
 
-    with open(args.file) as f:
+def solve(inputstr):
-        template = next(f).strip()
+    template, rest = inputstr.split("\n\n", maxsplit=1)
-        next(f)
+    rules = {}
-        rules = {}
+    for line in rest.splitlines():
-        for line in f:
+        pair, char = line.split(" -> ")
-            pair, char = line.strip().split(" -> ")
+        rules[pair] = (pair[0] + char, char + pair[1])
-            rules[pair] = (pair[0] + char, char + pair[1])
 
-    pairs = Counter(template[i:i+2] for i in range(len(template) - 1))
+    pairs = Counter(template[i : i + 2] for i in range(len(template) - 1))
 
     for i in range(10):
         pairs = step(pairs, rules)
@@ -41,11 +37,8 @@ def main():
     chars = count_chars(template, pairs).most_common()
     print(f"Part 1: {chars[0][1] - chars[-1][1]}")
 
-    for i in range(30): # 40 steps total
+    for i in range(30):  # 40 steps total
         pairs = step(pairs, rules)
 
     chars = count_chars(template, pairs).most_common()
     print(f"Part 2: {chars[0][1] - chars[-1][1]}")
-
-if __name__ == "__main__":
-    main()