2018 day 5

2018/day5.py

@@ -0,0 +1,59 @@
+with open('day5-input', 'r') as file:
+  data = [l.strip('\n') for l in file]
+# import numpy as np
+polymer = [c for c in reversed(data[0])]
+# polymer = [c for c in 'dabAcCaCBAcCcaDA']
+
+i = 0
+print(len(polymer))
+while i < len(polymer)-1:
+  if polymer[i] == polymer[i+1].swapcase():
+    polymer.pop(i)
+    polymer.pop(i)
+    i -= 2
+  i += 1
+print(len(polymer))  # Not 11196?!
+while i < len(polymer) - 1:
+  if polymer[i] == polymer[i + 1].swapcase():
+    polymer.pop(i)
+    polymer.pop(i)
+    i -= 2
+  i += 1
+print(len(polymer))  # Not 11196?!
+while i < len(polymer) - 1:
+  if polymer[i] == polymer[i + 1].swapcase():
+    polymer.pop(i)
+    polymer.pop(i)
+    i = -1
+  i += 1
+
+print(len(polymer))  # Part 1
+
+remaining_letters = {}
+for c in polymer:
+  c = c.lower()
+  if c in remaining_letters:
+    remaining_letters[c] += 1
+  else:
+    remaining_letters[c] = 1
+print(max(remaining_letters.items(), key=lambda x: x[1]))
+
+def react(letter):
+  polymer_2 = [c for c in data[0] if c.lower() != letter]
+  i = 0
+  while i < len(polymer_2)-1:
+    if polymer_2[i] == polymer_2[i+1].swapcase():
+      polymer_2.pop(i)
+      polymer_2.pop(i)
+      i -= 2
+    i += 1
+  while i < len(polymer_2) - 1:
+    if polymer_2[i] == polymer_2[i + 1].swapcase():
+      polymer_2.pop(i)
+      polymer_2.pop(i)
+      i = -1
+    i += 1
+  return len(polymer_2)
+# print(len(polymer_2))  # Not 10658?!
+removals = [react(i) for i in remaining_letters.keys()]
+print(max(removals))  # Part 2