🪨

VERSION

@@ -0,0 +1 @@
+🪨

makefile

@@ -14,6 +14,13 @@ CODE := $(BASE).py
 DATA := $(BASE).dat
 TEST := $(BASE).dtt
 
+save:
+	git add .
+	test `git log -1 --format=%s` == `cat VERSION` \
+		&& git commit --amend --reuse-message=head \
+		|| git commit -m `cat VERSION`
+	git log -1
+
 main: ${TEST}
 	echo 'test':
 	cat ${TEST} | docker compose run --rm advent python -u ${CODE}

y2023/p11.py

@@ -0,0 +1,16 @@
+import itertools
+
+
+def star_dist(a, b, N):
+    (xa, xb), (ya, yb) = map(sorted, zip(a, b))
+    sx = sum(xa < x < xb for x in xs)
+    sy = sum(ya < y < yb for y in ys)
+    return (xb - xa) + (yb - ya) + (N - 1) * (sx + sy)
+
+
+text = open(0).read()
+ys = {i for i, ln in enumerate(text.splitlines()) if set(ln) == {'.'}}
+xs = {i for i, ln in enumerate(zip(*text.splitlines())) if set(ln) == {'.'}}
+stars = {(x, y) for y, row in enumerate(text.splitlines()) for x, val in enumerate(row) if val == '#'}
+print(sum(star_dist(a, b, 2) for a, b in itertools.combinations(stars, 2)))
+print(sum(star_dist(a, b, 1_000_000) for a, b in itertools.combinations(stars, 2)))

y2023/p12.py

@@ -0,0 +1,35 @@
+import functools
+import re
+
+
+@functools.lru_cache(maxsize=None)
+def get_combos(pattern, ns):
+    out = 0
+    if not ns:
+        new = '_' * len(pattern)
+        if re.fullmatch(pattern, new):
+            out += 1
+    else:
+        n, *ns = ns
+        i_max = len(pattern) - sum(ns) - len(ns) - n + 1
+        for i in range(i_max):
+            new = '_' * i + '#' * n + '_' * (len(pattern) > i + n)
+            if re.fullmatch(pattern[:len(new)], new):
+                out += get_combos(pattern[len(new):], tuple(ns))
+    return out
+
+
+def combos(line, N=1):
+    pattern, ns = line.split()
+    # expand
+    pattern = '?'.join([pattern] * N)
+    ns = ','.join([ns] * N)
+    # parse
+    pattern = pattern.replace('.', '_').replace('?', '.')
+    ns = [int(n) for n in ns.split(',')]
+    return get_combos(pattern, tuple(ns))
+
+
+text = open(0).read()
+print(sum(combos(line) for line in text.splitlines()))
+print(sum(combos(line, 5) for line in text.splitlines()))