5 files changed, 1160 insertions, 1 deletions
diff --git a/day10/day10.py b/day10/day10.py
new file mode 100644
index 0000000..041c758
--- /dev/null
+++ b/day10/day10.py
@@ -0,0 +1,28 @@
+"""Day 10."""
+from collections import Counter
+from itertools import combinations
+from functools import lru_cache
+
+with open("input") as f:
+    orig_nums = sorted([int(x) for x in f.read().rstrip().split("\n")])
+
+rated_for = orig_nums[-1] + 3
+nums = [0] + orig_nums + [rated_for]
+diffs = [j - i for i, j in list(zip(nums[:-1], nums[1:]))]
+counter = Counter(diffs)
+
+# Part 1
+print(counter[1] * counter[3])
+
+@lru_cache(None)
+def arrangements(jolts, prev) -> int:
+    first, rest = jolts[0], jolts[1:]
+    if first - prev > 3:
+        return 0
+    elif not rest:
+        return 1
+    else:
+        return (arrangements(rest, first) + # Use first
+                arrangements(rest, prev))   # Skip first
+
+print(arrangements(tuple(orig_nums), 0))
diff --git a/day10/input b/day10/input
new file mode 100644
index 0000000..4a713ff
--- /dev/null
+++ b/day10/input
@@ -0,0 +1,96 @@
+99
+3
+1
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+
diff --git a/day8/day8.py b/day8/day8.py
index 446a02f..d271939 100644
--- a/day8/day8.py
+++ b/day8/day8.py
@@ -1,4 +1,4 @@
-"""Day 7."""
+"""Day 8."""
 with open("input") as f:
     instructions = f.read().rstrip().split("\n")
 
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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