day 14

14/14.py

@@ -0,0 +1,34 @@
+with open("input") as file:
+	startSequence = file.readline().rstrip("\n")
+	file.readline()
+	rulePairs = [line.split(" -> ") for line in file.read().splitlines()]
+	rules = {left: right for left, right in rulePairs}
+
+
+def solve(sequence):
+
+	pairCounts, elementCounts = {}, {}
+
+	for a, b in zip(sequence, sequence[1:]):
+		pairCounts.setdefault(a + b, 0)
+		pairCounts[a + b] += 1
+
+	for a in sequence:
+		elementCounts.setdefault(a, 0)
+		elementCounts[a] += 1
+
+	for i in range(40):
+		for (a, b), count in pairCounts.copy().items():
+			new = rules[a + b]
+			elementCounts.setdefault(new, 0)
+			elementCounts[new] += count
+			pairCounts.setdefault(a + new, 0)
+			pairCounts[a + new] += count
+			pairCounts.setdefault(new + b, 0)
+			pairCounts[new + b] += count
+			pairCounts[a + b] -= count
+
+	return max(elementCounts.values()) - min(elementCounts.values())
+
+
+print(solve(startSequence))

14/input

@@ -0,0 +1,102 @@
+KOKHCCHNKKFHBKVVHNPN
+
+BN -> C
+OS -> K
+BK -> C
+KO -> V
+HF -> K
+PS -> B
+OK -> C
+OC -> B
+FH -> K
+NV -> F
+HO -> H
+KK -> H
+CV -> P
+SC -> C
+FK -> N
+VV -> F
+FN -> F
+KP -> O
+SB -> O
+KF -> B
+CH -> K
+VF -> K
+BH -> H
+KV -> F
+CO -> N
+PK -> N
+NH -> P
+NN -> C
+PP -> H
+SH -> N
+VO -> O
+NC -> F
+BC -> B
+HC -> H
+FS -> C
+PN -> F
+CK -> K
+CN -> V
+HS -> S
+CB -> N
+OF -> B
+OV -> K
+SK -> S
+HP -> C
+SN -> P
+SP -> B
+BP -> C
+VP -> C
+BS -> K
+FV -> F
+PH -> P
+FF -> P
+VK -> F
+BV -> S
+VB -> S
+BF -> O
+BB -> H
+OB -> B
+VS -> P
+KB -> P
+SF -> N
+PF -> S
+HH -> P
+KN -> K
+PC -> B
+NB -> O
+VC -> P
+PV -> H
+KH -> O
+OP -> O
+NF -> K
+HN -> P
+FC -> H
+PO -> B
+OH -> C
+ON -> N
+VN -> B
+VH -> F
+FO -> B
+FP -> B
+BO -> H
+CC -> P
+CS -> K
+NO -> V
+CF -> N
+PB -> H
+KS -> P
+HK -> S
+HB -> K
+HV -> O
+SV -> H
+CP -> S
+NP -> N
+FB -> B
+KC -> V
+NS -> P
+OO -> V
+SO -> O
+NK -> K
+SS -> H

14/testInput

@@ -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