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y2019/p25.py

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+import itertools
+import sys
+
+from intcode import compute
+
+
+'''
+. . . . . . . . . . . . . . . . . .
+
+. . . . . . . . . . . . . . . . . .
+
+. . . . . . . . . . . . . . . . . .
+
+. . . . . . . # . . . . . . . . . .
+              |
+. . . . . . @-@-#-# . . . . . . . .
+                |
+. . . . . . . . C . . . . . . . . .
+                |
+. . . . . . . @ @-@ . . . . . . . .
+              | | |
+. . . . . . #-#-# #w@w@ . . . . . .
+                    | |
+. . . . . . . . Pn@e# # . . . . . .
+                e
+. . . . . . . . . . . . . . . . . .
+
+. . . . . . . . . . . . . . . . . .
+
+'''
+
+text = sys.stdin.read()
+
+code = '''
+north
+west
+take mug
+west
+take easter egg
+east
+east
+south
+south
+take asterisk
+south
+west
+north
+take jam
+south
+east
+north
+east
+take klein bottle
+south
+west
+take tambourine
+west
+take cake
+east
+south
+east
+take polygon
+north
+'''
+
+bytes_ = list(code.lstrip().encode())
+items = {line for line in code.splitlines() if line.startswith('take')}
+combos = itertools.combinations(sorted(items), 4)
+last_line = ''
+history = ''
+for c in map(chr, compute(text, iter(bytes_))):
+    history += c
+    if history.endswith('== Security Checkpoint =='):
+        take = next(combos)
+        drop = items.difference(take)
+        instructions = '\n'.join(
+            [line for line in take] +
+            [line.replace('take', 'drop') for line in drop] +
+            ['east\n']
+        )
+        bytes_.extend(instructions.encode())
+print(history.splitlines()[-1])