From 026be18835900671790ef0fa0c186224f2aefad4 Mon Sep 17 00:00:00 2001
From: Nick Thomas <me@ur.gs>
Date: Sat, 1 Dec 2018 12:20:10 +0000
Subject: [PATCH] Day 1

---
 .gitignore  |  3 +++
 01/part1.rs | 30 ++++++++++++++++++++++++++++++
 01/part2.rs | 45 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 78 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 01/part1.rs
 create mode 100644 01/part2.rs

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..9da658f
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+*/input
+*/part1
+*/part2
diff --git a/01/part1.rs b/01/part1.rs
new file mode 100644
index 0000000..bec44f2
--- /dev/null
+++ b/01/part1.rs
@@ -0,0 +1,30 @@
+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") {
+        // The `description` method of `io::Error` returns a string that describes the error
+        Err(why) => panic!("couldn't open input: {}", Error::description(&why)),
+        Ok(file) => file,
+    };
+
+    let reader = BufReader::new(file);
+    let lines = reader.lines();
+
+    let mut total: i128 = 0;
+
+    for result in lines {
+        let l = result.unwrap();
+        let offset:i128 = i128::from_str_radix(&l, 10).unwrap();
+
+        println!("{} => {}", l, offset);
+
+        total = total + offset;
+    }
+
+    println!("{}", total);
+
+    Ok(())
+}
diff --git a/01/part2.rs b/01/part2.rs
new file mode 100644
index 0000000..5308457
--- /dev/null
+++ b/01/part2.rs
@@ -0,0 +1,45 @@
+use std::collections::HashSet;
+use std::error::Error;
+use std::fs::File;
+use std::io::BufReader;
+use std::io::SeekFrom;
+use std::io::prelude::*;
+
+fn main() -> std::io::Result<()> {
+    let mut file = match File::open("input") {
+        // The `description` method of `io::Error` returns a string that describes the error
+        Err(why) => panic!("couldn't open input: {}", Error::description(&why)),
+        Ok(file) => file,
+    };
+
+    let mut repeat = true;
+    let mut total: i128 = 0;
+    let mut seen = HashSet::<i128>::new();
+    seen.insert(0);
+
+    while repeat {
+        file.seek(SeekFrom::Start(0));
+        let reader = BufReader::new(&file);
+        let lines = reader.lines();
+
+        for result in lines {
+            let l = result.unwrap();
+            let offset:i128 = i128::from_str_radix(&l, 10).unwrap();
+
+            total = total + offset;
+            println!("{} => {}", offset, total);
+
+            if seen.contains(&total) {
+                println!("seen {} before", total);
+                repeat = false;
+                break;
+            }
+
+            seen.insert(total);
+       }
+   }
+
+    println!("{}", total);
+
+    Ok(())
+}