From e2b9ee38c265467d586ee12a41dc3d83029c0c01 Mon Sep 17 00:00:00 2001
From: Luke Hubmayer-Werner <mongoose41@gmail.com>
Date: Mon, 14 Dec 2020 18:16:16 +1030
Subject: [PATCH] 2020 day 9

---
 2020/day09.py |   25 ++
 2020/input09  | 1000 +++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 1025 insertions(+)
 create mode 100644 2020/day09.py
 create mode 100644 2020/input09

diff --git a/2020/day09.py b/2020/day09.py
new file mode 100644
index 0000000..5540cf7
--- /dev/null
+++ b/2020/day09.py
@@ -0,0 +1,25 @@
+import numpy as np
+with open('input09', 'r') as file:
+  input = [int(l.strip()) for l in file.readlines()]
+inp = np.array(input)
+
+def find_deviant():
+  data = np.tile(inp, [25,1])
+  for i in range(25):
+    data[i,i+1:] += inp[:-i-1]
+  for i,num in enumerate(input[25:], 25):
+    if not (data[:, max(0, i-25):i] == num).any():
+      return num, i
+
+num, i = find_deviant()
+print(f'Part 1: first deviant at {i} - {num}')
+
+def find_sumstreak(number):
+  inps = inp.cumsum()
+  for i in range(len(input)):
+    hits = (inps[i:]-inps[i]) == number
+    if hits.any():
+      return i+1, i+hits.argmax()+1  # Not entirely sure where the +1 snuck in but w/e
+
+i, j = find_sumstreak(num)
+print(f'Part 2: slice {i}:{j} - min+max = {inp[i:j].min()+inp[i:j].max()}')
diff --git a/2020/input09 b/2020/input09
new file mode 100644
index 0000000..31690cc
--- /dev/null
+++ b/2020/input09
@@ -0,0 +1,1000 @@
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