Day Two

2 files changed, 1024 insertions, 0 deletions

diff --git a/2020/input/two.txt b/2020/input/two.txt
new file mode 100644
index 0000000..19658f1
--- /dev/null
+++ b/2020/input/two.txt
@@ -0,0 +1,1000 @@
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diff --git a/2020/two.nim b/2020/two.nim
new file mode 100644
index 0000000..9ca94fb
--- /dev/null
+++ b/2020/two.nim
@@ -0,0 +1,24 @@
+import os, strutils
+
+let input = paramStr(1)
+var valid: int = 0
+var official: int = 0
+
+for line in lines(input):
+  var frequency: int = 0
+  let
+    entry: seq[string] = split(line, {'-', ' ', ':'})
+    low: int = parseInt(entry[0])
+    high: int = parseInt(entry[1])
+    letter: char = entry[2][0]
+    password: string = entry[4]
+  for char in password:
+    if char == letter:
+      inc(frequency)
+  if low <= frequency and frequency <= high:
+    inc(valid)
+  if password[low-1] == letter xor password[high-1] == letter:
+    inc(official)
+
+echo valid
+echo official