🕺

makefile

 URL := https://adventofcode.com/${YEAR}/day/`echo ${DAY} | bc`/input
 
 pyrun: ${DATA}
-	PYTHONPATH=. python3 -u ${CODE} < ${DATA}
+	cat ${DATA} | docker run -v `pwd`:/app/ -w /app/ -i --rm python:latest python -u ${CODE}
 
 ${DATA}:
 	# avoid spam in the lead up to the event

y2022/p07.py

+import collections
+import itertools
+
+
+text = open(0).read()
+
+
+path = []
+dirs = collections.defaultdict(int)
+for line in map(str.split, text.splitlines()):
+    match line:
+        case ('$', 'cd', '..'):
+            path.pop()
+        case ('$', 'cd', loc):
+            path.append(loc)
+        case ('$', 'ls'):
+            pass
+        case ('dir', _):
+            pass
+        case (size, _):
+            for leg in itertools.accumulate(path):
+                dirs[leg] += int(size)
+
+
+ans1 = sum(size for size in dirs.values() if size <= 100_000)
+print(ans1)
+
+available = 70_000_000 - dirs['/']
+ans2 = min(filter(lambda size: available + size >= 30_000_000, dirs.values()))
+print(ans2)