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authorj-james2020-12-09 05:43:41 +0000
committerj-james2020-12-09 05:43:41 +0000
commitc651051cf36e95c5603cd3f7aef2e6d278809333 (patch)
treecc3078033b25c7e9d64244ab292c1ff9beba84c0
parentdb5d72b57574042ca695704172ded112a9163e14 (diff)
Day Nine
-rw-r--r--2020/input/nine.txt1000
-rw-r--r--2020/nine.nim29
2 files changed, 1029 insertions, 0 deletions
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