From 4bebe8110ed800194e978832a507b051f49ede73 Mon Sep 17 00:00:00 2001
From: Nick Thomas <me@ur.gs>
Date: Mon, 3 Dec 2018 23:44:18 +0000
Subject: [PATCH] Day 2

---
 02/part1.rs | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 02/part2.rs | 33 +++++++++++++++++++++++++++++++++
 2 files changed, 81 insertions(+)
 create mode 100644 02/part1.rs
 create mode 100644 02/part2.rs

diff --git a/02/part1.rs b/02/part1.rs
new file mode 100644
index 0000000..8bab7e1
--- /dev/null
+++ b/02/part1.rs
@@ -0,0 +1,48 @@
+use std::collections::HashMap;
+use std::error::Error;
+use std::fs::File;
+use std::io::BufReader;
+use std::io::prelude::*;
+
+fn main() -> std::io::Result<()> {
+    let file = match File::open("input") {
+        Err(why) => panic!("couldn't open input: {}", Error::description(&why)),
+        Ok(file) => file,
+    };
+
+    let reader = BufReader::new(file);
+    let lines = reader.lines();
+
+    for result in lines {
+        let l = result.unwrap();
+        let mut freq = HashMap::new();
+        let mut is2 = false;
+        let mut is3 = false;
+
+        for ch in l.chars() {
+            let count = freq.entry(ch).or_insert(0);
+            *count += 1;
+        }
+
+        for (_ch, count) in freq {
+            if count == 2 {
+                is2 = true;
+            }
+            if count == 3 {
+                is3 = true;
+            }
+        }
+
+        if is2 {
+            count2+=1;
+        }
+        
+        if is3 {
+            count3+=1;
+        }
+    }
+
+    println!("2: {} 3: {} 2*3: {}", count2, count3, count2 * count3);
+
+    Ok(())
+}
diff --git a/02/part2.rs b/02/part2.rs
new file mode 100644
index 0000000..35546ce
--- /dev/null
+++ b/02/part2.rs
@@ -0,0 +1,33 @@
+use std::collections::HashMap;
+use std::error::Error;
+use std::fs::File;
+use std::io::BufReader;
+use std::io::prelude::*;
+
+fn main() -> std::io::Result<()> {
+    let mut f = File::open("input")?;
+    let mut data = String::new();
+
+    f.read_to_string(&mut data)?;
+
+    for lineA in data.lines() {
+        for lineB in data.lines() {
+            let mut a = lineA.chars();
+            let mut b = lineB.chars();
+            let mut diffCount = 0;
+            let mut pairs = a.zip(b);
+
+            for (aChar, bChar) in pairs {
+                if aChar != bChar {
+                    diffCount += 1;
+                }
+            }
+
+            if diffCount == 1 {
+                println!("lineA: {} lineB: {}", lineA, lineB);
+            }
+        }
+    }
+
+    Ok(())
+}