2015 day 8.

src/holt59/aoc/2015/day7.py

@@ -2,7 +2,7 @@ import logging
 import operator
 import os
 import sys
-from typing import Callable, Literal, TypeAlias, cast
+from typing import Callable
 
 VERBOSE = os.getenv("AOC_VERBOSE") == "True"
 logging.basicConfig(level=logging.INFO if VERBOSE else logging.WARNING)

src/holt59/aoc/2015/day8.py

@@ -0,0 +1,35 @@
+import logging
+import os
+import sys
+
+VERBOSE = os.getenv("AOC_VERBOSE") == "True"
+logging.basicConfig(level=logging.INFO if VERBOSE else logging.WARNING)
+
+
+lines = sys.stdin.read().splitlines()
+
+answer_1 = sum(
+    # left and right quotes (not in memory)
+    2
+    # each \\ adds one character in the literals (compared to memory)
+    + line.count(R"\\")
+    # each \" adds one character in the literals (compared to memory)
+    + line[1:-1].count(R"\"")
+    # each \xFF adds 3 characters in the literals (compared to memory), but we must not
+    # count A\\x (A != \), but we must count A\\\x (A != \) - in practice we should also
+    # avoid \\\\x, etc., but this does not occur in the examples and the actual input
+    + 3 * (line.count(R"\x") - line.count(R"\\x") + line.count(R"\\\x"))
+    for line in lines
+)
+print(f"answer 1 is {answer_1}")
+
+answer_2 = sum(
+    # needs to wrap in quotes (2 characters)
+    2
+    # needs to escape every \ with an extra \
+    + line.count("\\")
+    # needs to escape every " with an extra \ (including the first and last ones)
+    + line.count('"')
+    for line in lines
+)
+print(f"answer 2 is {answer_2}")