From c651051cf36e95c5603cd3f7aef2e6d278809333 Mon Sep 17 00:00:00 2001
From: j-james
Date: Tue, 8 Dec 2020 21:43:41 -0800
Subject: Day Nine

---
 2020/input/nine.txt | 1000 +++++++++++++++++++++++++++++++++++++++++++++++++++
 2020/nine.nim       |   29 ++
 2 files changed, 1029 insertions(+)
 create mode 100644 2020/input/nine.txt
 create mode 100644 2020/nine.nim

(limited to '2020')

diff --git a/2020/input/nine.txt b/2020/input/nine.txt
new file mode 100644
index 0000000..0f64783
--- /dev/null
+++ b/2020/input/nine.txt
@@ -0,0 +1,1000 @@
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diff --git a/2020/nine.nim b/2020/nine.nim
new file mode 100644
index 0000000..8b15391
--- /dev/null
+++ b/2020/nine.nim
@@ -0,0 +1,29 @@
+# Day Nine: Encoding Error
+import os, strutils, sequtils
+
+let input: string = paramStr(1)
+let xmas: seq[int] = map(split(strip(readFile(input)), '\n'), parseInt)
+const preamble: int = 25
+var encryption, weakness, smallest: int
+
+for i in preamble ..< len(xmas):
+  var valid: bool
+  for j in 0 .. preamble:
+    for k in 0 .. preamble:
+      if xmas[i - k] + xmas[i - j] == xmas[i]:
+        valid = true
+  if not valid:
+    encryption = xmas[i]
+for largest in 0 ..< len(xmas):
+  var sum: int = 0
+  for val in smallest .. largest:
+    inc(sum, xmas[val])
+  while sum > encryption:
+    dec(sum, xmas[smallest])
+    inc(smallest)
+  if sum == encryption:
+    weakness = xmas[smallest] + xmas[largest]
+    break
+
+echo encryption
+echo weakness
-- 
cgit v1.2.3-70-g09d2