From c69ad1e76ac71dda0c3dc6f6f52c707564552e95 Mon Sep 17 00:00:00 2001
From: Colin McMillen <colin@semicolin.games>
Date: Wed, 2 Dec 2020 11:18:16 -0500
Subject: [PATCH] day 2 solution

---
 2020/Program.cs |   52 ++-
 2020/day02.txt  | 1000 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 1051 insertions(+), 1 deletion(-)
 create mode 100644 2020/day02.txt

diff --git a/2020/Program.cs b/2020/Program.cs
index 7656400..33c2f03 100644
--- a/2020/Program.cs
+++ b/2020/Program.cs
@@ -63,8 +63,58 @@ namespace AdventOfCode {
       Assert.Equal(140379120, Day1Part2(testInput));
     }
 
+    static bool IsPasswordValid1(string spec) {
+      string[] tokens = spec.Split(' ');
+      string[] numbers = tokens[0].Split('-');
+      int min = int.Parse(numbers[0]);
+      int max = int.Parse(numbers[1]);
+      char required = tokens[1][0];
+      string password = tokens[2];
+
+      int count = 0;
+      for (int i = 0; i < password.Length; i++) {
+        if (password[i] == required) {
+          count++;
+        }
+      }
+      return min <= count && count <= max;
+    }
+
+    static bool IsPasswordValid2(string spec) {
+      string[] tokens = spec.Split(' ');
+      string[] numbers = tokens[0].Split('-');
+      int lowIndex = int.Parse(numbers[0]) - 1;
+      int highIndex = int.Parse(numbers[1]) - 1;
+      char required = tokens[1][0];
+      string password = tokens[2];
+      return
+        (password[lowIndex] == required && password[highIndex] != required) ||
+        (password[lowIndex] != required && password[highIndex] == required);
+    }
+
+    static int Day2Part1() {
+      return File.ReadAllLines(RootDir + "day02.txt").Count(IsPasswordValid1);
+    }
+
+    static int Day2Part2() {
+      return File.ReadAllLines(RootDir + "day02.txt").Count(IsPasswordValid2);
+    }
+
+    [Fact]
+    static void Day2Test() {
+      Assert.True(IsPasswordValid1("1-3 a: abcde"));
+      Assert.False(IsPasswordValid1("1-3 b: cdefg"));
+      Assert.True(IsPasswordValid1("2-9 c: ccccccccc"));
+      Assert.Equal(603, Day2Part1());
+
+      Assert.True(IsPasswordValid2("1-3 a: abcde"));
+      Assert.False(IsPasswordValid2("1-3 b: cdefg"));
+      Assert.False(IsPasswordValid2("2-9 c: ccccccccc"));
+      Assert.Equal(404, Day2Part2());
+    }
+
     static void Main(string[] args) {
-      Day1Test();
+      Day2Test();
     }
   }
 }
diff --git a/2020/day02.txt b/2020/day02.txt
new file mode 100644
index 0000000..9219f52
--- /dev/null
+++ b/2020/day02.txt
@@ -0,0 +1,1000 @@
+13-14 f: ffffffffnfffvv
+10-12 w: kwtzpnzspwwwdz
+2-3 n: nnjn
+2-3 h: hhhh
+2-11 c: crccccccccsccc
+1-6 b: lcpcbcr
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+4-5 m: mmfmm
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