AOC15
authorJustin Worthe <justin.worthe@entelect.co.za>
Thu, 15 Dec 2016 10:08:01 +0000 (12:08 +0200)
committerJustin Worthe <justin.worthe@entelect.co.za>
Thu, 15 Dec 2016 10:08:01 +0000 (12:08 +0200)
aoc15/Cargo.lock [new file with mode: 0644]
aoc15/Cargo.toml [new file with mode: 0644]
aoc15/input.txt [new file with mode: 0644]
aoc15/src/main.rs [new file with mode: 0644]

diff --git a/aoc15/Cargo.lock b/aoc15/Cargo.lock
new file mode 100644 (file)
index 0000000..38f1d9c
--- /dev/null
@@ -0,0 +1,98 @@
+[root]
+name = "aoc15"
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+dependencies = [
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+]
+
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+]
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+name = "kernel32-sys"
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+]
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+]
+
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+ "libc 0.2.18 (registry+https://github.com/rust-lang/crates.io-index)",
+]
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+
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diff --git a/aoc15/Cargo.toml b/aoc15/Cargo.toml
new file mode 100644 (file)
index 0000000..eb75c1d
--- /dev/null
@@ -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/aoc15/input.txt b/aoc15/input.txt
new file mode 100644 (file)
index 0000000..c4cf544
--- /dev/null
@@ -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/aoc15/src/main.rs b/aoc15/src/main.rs
new file mode 100644 (file)
index 0000000..3db59ea
--- /dev/null
@@ -0,0 +1,36 @@
+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)).unwrap();
+    println!("First pass at t={}", pass);
+}
+
+fn can_pass(gears: &Vec<(i32, i32)>, time: i32) -> bool {
+    for i in 0..gears.len() {
+        let (gear_pos, gear_size) = gears[i];
+        if (gear_pos + time + i as i32 + 1) % gear_size != 0 {
+            return false;
+        }
+    }
+    true
+}
+
+fn read_file() -> Vec<(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()
+        .map(|line| line.unwrap().trim().to_string())
+        .filter(|line| line.len() > 0)
+        .map(|line| {
+            let cap = line_regex.captures(line.as_ref()).unwrap();
+            (cap.at(2).unwrap().parse().unwrap(), cap.at(1).unwrap().parse().unwrap())
+        })
+        .collect()
+}