day 02

Author: Liedtke

day01.py

@@ -1,4 +1,4 @@
 lists = [tuple(map(int, line.split("   "))) for line in open("inputs/day01.txt").read().split("\n")]
-lists = [sorted(pair[i] for pair in lists) for i in range(2)]
-print(f"part 1 = {sum(abs(x - y) for x, y in zip(lists[0], lists[1]))}")
+lists = [sorted(li) for li in zip(*lists)]
+print(f"part 1 = {sum(abs(x - y) for x, y in zip(*lists))}")
 print(f"part 2 = {sum(sum(1 for x in lists[1] if x == value) * value for value in lists[0])}")

day02.py

@@ -0,0 +1,13 @@
+def is_valid(values):
+    prev = values[0]
+    asc = values[1] > values[0]
+    for v in values[1:]:
+        if asc != (v > prev) or not (1 <= abs(v - prev) <= 3):
+            return False
+        prev = v
+    return True
+
+reports = [[int(n) for n in line.split(" ")] for line in open("inputs/day02.txt").read().split("\n")]
+print(f"part 1 = {sum(is_valid(r) for r in reports)}")
+# Brute force: Just try out removing each element until we find a valid combination.
+print(f"part 2 = {sum(any(is_valid(r[:i] + r[i+1:]) for i in range(len(r))) for r in reports)}")