Solve 2024 day 7

2024/d7.py

@@ -0,0 +1,43 @@
+from lib import get_data
+from lib import Grid2D
+from lib import ints
+from collections import defaultdict
+
+data = """ 190: 10 19
+3267: 81 40 27
+83: 17 5
+156: 15 6
+7290: 6 8 6 15
+161011: 16 10 13
+192: 17 8 14
+21037: 9 7 18 13
+292: 11 6 16 20
+"""
+
+data = get_data(__file__)
+
+
+def comp(acc, rest, part_2=False):
+    if rest == []:
+        return acc
+
+    nacc = []
+    for a in acc:
+        nacc.append(a + rest[0])
+        nacc.append(a * rest[0])
+        if part_2:
+            nacc.append(int(str(a) + str(rest[0])))
+    return comp(nacc, rest[1:], part_2)
+
+
+t1, t2 = 0, 0
+for line in data.splitlines():
+    xs = ints(line)
+    expected = xs[0]
+    if xs[0] in comp([xs[1]], xs[2:]):
+        t1 += xs[0]
+    if xs[0] in comp([xs[1]], xs[2:], True):
+        t2 += xs[0]
+
+print(t1)
+print(t2)

README.md

@@ -297,4 +297,5 @@ and focus. Of course, learning more algorithms and techniques helps.
 - Day 4: `00:07:47  1101      0   00:24:07  2410      0`
 - Day 5: `00:07:07   679      0   00:23:02  1998      0`
 - Day 6: `00:09:43  1082      0   00:16:29   464      0`
-
+- Day 7: `00:12:29  2058      0   00:13:08  1170      0`
+- Day 8: