Refile for merging repos

4 files changed, 147 insertions, 0 deletions

diff --git a/2016/aoc15/Cargo.lock b/2016/aoc15/Cargo.lock
new file mode 100644
index 0000000..38f1d9c
--- /dev/null
+++ b/2016/aoc15/Cargo.lock
@@ -0,0 +1,98 @@
+[root]
+name = "aoc15"
+version = "0.1.0"
+dependencies = [
+ "regex 0.1.80 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "aho-corasick"
+version = "0.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "memchr 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "kernel32-sys"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "libc"
+version = "0.2.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
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+name = "memchr"
+version = "0.1.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libc 0.2.18 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
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+name = "regex"
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+dependencies = [
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+ "libc 0.2.18 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
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+name = "thread_local"
+version = "0.2.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "thread-id 2.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
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+
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+
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diff --git a/2016/aoc15/Cargo.toml b/2016/aoc15/Cargo.toml
new file mode 100644
index 0000000..eb75c1d
--- /dev/null
+++ b/2016/aoc15/Cargo.toml
@@ -0,0 +1,7 @@
+[package]
+name = "aoc15"
+version = "0.1.0"
+authors = ["Justin Worthe <justin.worthe@entelect.co.za>"]
+
+[dependencies]
+regex = "0.1"
\ No newline at end of file
diff --git a/2016/aoc15/input.txt b/2016/aoc15/input.txt
new file mode 100644
index 0000000..c4cf544
--- /dev/null
+++ b/2016/aoc15/input.txt
@@ -0,0 +1,7 @@
+Disc #1 has 17 positions; at time=0, it is at position 5.
+Disc #2 has 19 positions; at time=0, it is at position 8.
+Disc #3 has 7 positions; at time=0, it is at position 1.
+Disc #4 has 13 positions; at time=0, it is at position 7.
+Disc #5 has 5 positions; at time=0, it is at position 1.
+Disc #6 has 3 positions; at time=0, it is at position 0.
+Disc #7 has 11 positions; at time=0, it is at position 0.
diff --git a/2016/aoc15/src/main.rs b/2016/aoc15/src/main.rs
new file mode 100644
index 0000000..a7f0f64
--- /dev/null
+++ b/2016/aoc15/src/main.rs
@@ -0,0 +1,35 @@
+extern crate regex;
+
+use regex::Regex;
+use std::io::BufReader;
+use std::io::prelude::*;
+use std::fs::File;
+
+
+fn main() {
+    let gears = read_file();
+    let pass = (0..).find(|&i| can_pass(&gears, i)).expect("Reached end of infinite range without finding output");
+    println!("First pass at t={}", pass);
+}
+
+fn can_pass(gears: &Vec<(i32, i32, i32)>, time: i32) -> bool {
+    gears.iter().all(|&(time_offset, init_pos, gear_size)| (init_pos + time_offset + time) % gear_size == 0)
+}
+
+fn read_file() -> Vec<(i32, i32, i32)> {
+    let file = BufReader::new(File::open("input.txt").unwrap());
+    let line_regex = Regex::new(r"Disc #(\d+) has (\d+) positions; at time=0, it is at position (\d+).").unwrap();
+    file.lines()
+        .filter_map(|line| {
+            line_regex.captures(line.unwrap().as_ref()).and_then(|cap| {
+                let time_offset = cap.at(1).and_then(|s| s.parse::<i32>().ok());
+                let init_pos = cap.at(3).and_then(|s| s.parse::<i32>().ok());
+                let gear_size = cap.at(2).and_then(|s| s.parse::<i32>().ok());
+                match (time_offset, init_pos, gear_size) {
+                    (Some(a), Some(b), Some(c)) => Some((a,b,c)),
+                    _ => None
+                }
+            })
+        })
+        .collect()
+}