3 files changed, 197 insertions, 0 deletions

diff --git a/day14/__init__.py b/day14/__init__.py
new file mode 100644
index 0000000..738ea8f
--- /dev/null
+++ b/day14/__init__.py
@@ -0,0 +1,77 @@
+import math
+from abc import ABC
+from collections import Counter
+from copy import copy
+from typing import List, Tuple, Union, Dict
+
+from aoc import BaseAssignment
+
+
+class Assignment(BaseAssignment, ABC):
+    max_pre_calculations = 4
+    steps = 0
+    mapping_cache = dict()
+
+    def parse_item(self, item: str) -> Union[str, Tuple[str, str], None]:
+        if '>' in item:
+            return item.split(' -> ')
+
+        if item == '':
+            return None
+
+        return item
+
+
+    def read_input(self, example = False) -> Tuple[str, Dict[str, str]]:
+        input = super().read_input(example)
+
+        template = next(input)
+        next(input)
+
+        mapping = dict(input)
+
+        return template, mapping
+
+    def run(self, input: Tuple[str, Dict[str, str]]) -> int:
+        template, mapping = input
+
+        counter = Counter([
+            f'{template[i:i+2]}'
+            for i in range(len(template) - 1)
+        ])
+
+        char_count = {
+            **{
+                  c: 1 if c in template else 0
+                  for c
+                  in mapping.values()
+            },
+            **Counter(template),
+        }
+
+        for _ in range(self.steps):
+            new_counter = {
+                pair: 0
+                for pair
+                in mapping.keys()
+            }
+
+            for key, value in counter.items():
+                middle = mapping[key]
+
+                char_count[middle] += value
+                new_counter[f'{key[0]}{middle}'] += value
+                new_counter[f'{middle}{key[1]}'] += value
+
+            counter = new_counter
+
+        return max(char_count.values()) - min(char_count.values())
+
+class AssignmentOne(Assignment):
+    example_result = 1588
+    steps = 10
+
+class AssignmentTwo(Assignment):
+    max_pre_calculations = 4
+    example_result = 2188189693529
+    steps = 40
diff --git a/day14/example.txt b/day14/example.txt
new file mode 100644
index 0000000..b5594dd
--- /dev/null
+++ b/day14/example.txt
@@ -0,0 +1,18 @@
+NNCB
+
+CH -> B
+HH -> N
+CB -> H
+NH -> C
+HB -> C
+HC -> B
+HN -> C
+NN -> C
+BH -> H
+NC -> B
+NB -> B
+BN -> B
+BB -> N
+BC -> B
+CC -> N
+CN -> C
diff --git a/day14/input.txt b/day14/input.txt
new file mode 100644
index 0000000..171af3e
--- /dev/null
+++ b/day14/input.txt
@@ -0,0 +1,102 @@
+COPBCNPOBKCCFFBSVHKO
+
+NS -> H
+FS -> O
+PO -> C
+NV -> N
+CK -> B
+FK -> N
+PS -> C
+OF -> F
+KK -> F
+PP -> S
+VS -> K
+VB -> V
+BP -> P
+BB -> K
+BF -> C
+NN -> V
+NO -> F
+SV -> C
+OK -> N
+PH -> P
+KV -> B
+PN -> O
+FN -> V
+SK -> V
+VC -> K
+BH -> P
+BO -> S
+HS -> H
+HK -> S
+HC -> S
+HF -> B
+PC -> C
+CF -> B
+KN -> H
+CS -> N
+SP -> O
+VH -> N
+CC -> K
+KP -> N
+NP -> C
+FO -> H
+FV -> N
+NC -> F
+KB -> N
+VP -> O
+KO -> F
+CP -> F
+OH -> F
+KC -> H
+NB -> F
+HO -> P
+SC -> N
+FF -> B
+PB -> H
+FB -> K
+SN -> B
+VO -> K
+OO -> N
+NF -> B
+ON -> P
+SF -> H
+FP -> H
+HV -> B
+NH -> B
+CO -> C
+PV -> P
+VV -> K
+KS -> P
+OS -> S
+SB -> P
+OC -> N
+SO -> K
+BS -> B
+CH -> V
+PK -> F
+OB -> P
+CN -> N
+CB -> N
+VF -> O
+VN -> K
+PF -> P
+SH -> H
+FH -> N
+HP -> P
+KF -> V
+BK -> H
+OP -> C
+HH -> F
+SS -> V
+BN -> C
+OV -> F
+HB -> P
+FC -> C
+BV -> H
+VK -> S
+NK -> K
+CV -> K
+HN -> K
+BC -> K
+KH -> P