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-rw-r--r--day9/day9.py35
-rw-r--r--day9/input1000
2 files changed, 1035 insertions, 0 deletions
diff --git a/day9/day9.py b/day9/day9.py
new file mode 100644
index 0000000..3bd8155
--- /dev/null
+++ b/day9/day9.py
@@ -0,0 +1,35 @@
+"""Day 9."""
+from itertools import permutations
+
+with open("input") as f:
+ nums = [int(x) for x in f.read().rstrip().split("\n")]
+
+preamble_length = 25
+invalid_number = None
+
+# Part 1
+for idx, val in enumerate(nums[preamble_length:], start=preamble_length):
+ pre = nums[idx - preamble_length: idx]
+ valid = False
+ for combs in permutations(pre, 2):
+ if sum(combs) == val:
+ valid = True
+ if not valid:
+ invalid_number = val
+ print(invalid_number)
+ break
+
+# Part 2
+found = False
+for x in range(len(nums)):
+ for y in range(x + 1, len(nums)):
+ subset = nums[x:y]
+ total = sum(subset)
+ if total > invalid_number:
+ break
+ if total == invalid_number:
+ print(min(subset) + max(subset))
+ found = True
+ break
+ if found:
+ break
diff --git a/day9/input b/day9/input
new file mode 100644
index 0000000..c9c6b80
--- /dev/null
+++ b/day9/input
@@ -0,0 +1,1000 @@
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